2024 day 22.

2024 day 21 part 1.
2024 day 20.
2024-12-22 14:07:40 +01:00 · 2024-12-21 13:13:31 +01:00 · 2024-12-20 09:19:12 +01:00 · 2024-12-19 12:13:00 +01:00 · 2024-12-18 10:41:01 +01:00 · 2024-12-18 08:54:06 +01:00
193 changed files with 17476 additions and 3507 deletions
--- a/poetry.lock
+++ b/poetry.lock
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+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
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 [package.dependencies]
 numpy = ">=1.23.5,<2.3"
 [package.extras]
 dev = ["cython-lint (>=0.12.2)", "doit (>=0.36.0)", "mypy (==1.10.0)", "pycodestyle", "pydevtool", "rich-click", "ruff (>=0.0.292)", "types-psutil", "typing_extensions"]
 doc = ["jupyterlite-pyodide-kernel", "jupyterlite-sphinx (>=0.13.1)", "jupytext", "matplotlib (>=3.5)", "myst-nb", "numpydoc", "pooch", "pydata-sphinx-theme (>=0.15.2)", "sphinx (>=5.0.0,<=7.3.7)", "sphinx-design (>=0.4.0)"]
 test = ["Cython", "array-api-strict (>=2.0)", "asv", "gmpy2", "hypothesis (>=6.30)", "meson", "mpmath", "ninja", "pooch", "pytest", "pytest-cov", "pytest-timeout", "pytest-xdist", "scikit-umfpack", "threadpoolctl"]
 [[package]]
 name = "six"
-version = "1.16.0"
+version = "1.17.0"
 description = "Python 2 and 3 compatibility utilities"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
 files = [
-    {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
+    {file = "six-1.17.0-py2.py3-none-any.whl", hash = "sha256:4721f391ed90541fddacab5acf947aa0d3dc7d27b2e1e8eda2be8970586c3274"},
-    {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
+    {file = "six-1.17.0.tar.gz", hash = "sha256:ff70335d468e7eb6ec65b95b99d3a2836546063f63acc5171de367e834932a81"},
 ]
 [[package]]
@ -1245,6 +1477,20 @@ files = [
 docs = ["myst-parser", "pydata-sphinx-theme", "sphinx"]
 test = ["argcomplete (>=3.0.3)", "mypy (>=1.7.0)", "pre-commit", "pytest (>=7.0,<8.2)", "pytest-mock", "pytest-mypy-testing"]
 [[package]]
 name = "types-networkx"
 version = "3.4.2.20241115"
 description = "Typing stubs for networkx"
 optional = false
 python-versions = ">=3.8"
 files = [
    {file = "types-networkx-3.4.2.20241115.tar.gz", hash = "sha256:d669b650cf6c6c9ec879a825449eb04a5c10742f3109177e1683f57ee49e0f59"},
    {file = "types_networkx-3.4.2.20241115-py3-none-any.whl", hash = "sha256:f0c382924d6614e06bf0b1ca0b837b8f33faa58982bc086ea762efaf39aa98dd"},
 ]
 [package.dependencies]
 numpy = ">=1.20"
 [[package]]
 name = "typing-extensions"
 version = "4.12.2"
@ -1281,4 +1527,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "b643261f91a781d77735e05f6d2ac1002867600c2df6393a9d1a15f5e1189109"
+content-hash = "5b57bccd8dc65a9acecbe187939bae625ef6a259f4188c6587907245bcfa604f"
--- a/pyproject.toml
+++ b/pyproject.toml
@ -12,10 +12,12 @@ python = "^3.10"
 numpy = "^2.1.3"
 tqdm = "^4.67.1"
 parse = "^1.20.2"
 scipy = "^1.14.1"
 sympy = "^1.13.3"
 networkx = "^3.4.2"
-pandas = "^2.2.3"
+pillow = "^11.0.0"
 imageio = "^2.36.1"
 pygifsicle = "^1.1.0"
 opencv-python = "^4.10.0.84"
 [tool.poetry.group.dev.dependencies]
 pyright = "^1.1.389"
@ -23,6 +25,14 @@ ruff = "^0.8.1"
 poethepoet = "^0.31.1"
 ipykernel = "^6.29.5"
 networkx-stubs = "^0.0.1"
 types-networkx = "^3.4.2.20241115"
 [tool.poetry.group.cplex.dependencies]
 docplex = "^2.28.240"
 cplex = "^22.1.1.2"
 [tool.poetry.group.ortools.dependencies]
 ortools = "^9.11.4210"
 [tool.poetry.scripts]
 holt59-aoc = "holt59.aoc.__main__:main"
--- a/src/holt59/aoc/2015/day1.py
+++ b/src/holt59/aoc/2015/day1.py
@ -1,10 +1,12 @@
-import sys
+from typing import Any, Iterator
-line = sys.stdin.read().strip()
+from ..base import BaseSolver
 floor = 0
 floors = [(floor := floor + (1 if c == "(" else -1)) for c in line]
-print(f"answer 1 is {floors[-1]}")
+class Solver(BaseSolver):
-print(f"answer 2 is {floors.index(-1)}")
+    def solve(self, input: str) -> Iterator[Any]:
        floor = 0
        floors = [(floor := floor + (1 if c == "(" else -1)) for c in input]
        yield floors[-1]
        yield floors.index(-1)
--- a/src/holt59/aoc/2015/day10.py
+++ b/src/holt59/aoc/2015/day10.py
@ -1,7 +1,7 @@
 import itertools
-import sys
+from typing import Any, Iterator
-line = sys.stdin.read().strip()
+from ..base import BaseSolver
 # see http://www.se16.info/js/lands2.htm for the explanation of 'atoms' (or elements)
 #
@ -9,7 +9,7 @@ line = sys.stdin.read().strip()
 # CodeGolf answer https://codegolf.stackexchange.com/a/8479/42148
 # fmt: off
-atoms = [
+ATOMS: list[tuple[str, tuple[int, ...]]] = [
    ("22", (0, )),  # 0
    ("13112221133211322112211213322112", (71, 90, 0, 19, 2, )),  # 1
    ("312211322212221121123222112", (1, )),  # 2
@ -105,7 +105,7 @@ atoms = [
 ]
 # fmt: on
-starters = [
+STARTERS = [
    "1",
    "11",
    "21",
@ -122,27 +122,26 @@ def look_and_say_length(s: str, n: int) -> int:
    if n == 0:
        return len(s)
-    if s in starters:
+    if s in STARTERS:
        return look_and_say_length(
            "".join(f"{len(list(g))}{k}" for k, g in itertools.groupby(s)), n - 1
        )
-    counts = {i: 0 for i in range(len(atoms))}
+    counts = {i: 0 for i in range(len(ATOMS))}
-    idx = next(i for i, (a, _) in enumerate(atoms) if s == a)
+    idx = next(i for i, (a, _) in enumerate(ATOMS) if s == a)
    counts[idx] = 1
    for _ in range(n):
-        c2 = {i: 0 for i in range(len(atoms))}
+        c2 = {i: 0 for i in range(len(ATOMS))}
        for i in counts:
-            for j in atoms[i][1]:
+            for j in ATOMS[i][1]:
                c2[j] += counts[i]
        counts = c2
-    return sum(counts[i] * len(a[0]) for i, a in enumerate(atoms))
+    return sum(counts[i] * len(a[0]) for i, a in enumerate(ATOMS))
-answer_1 = look_and_say_length(line, 40)
+class Solver(BaseSolver):
-print(f"answer 1 is {answer_1}")
+    def solve(self, input: str) -> Iterator[Any] | None:
-
+        yield look_and_say_length(input, 40)
-answer_2 = look_and_say_length(line, 50)
+        yield look_and_say_length(input, 50)
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day11.py
+++ b/src/holt59/aoc/2015/day11.py
@ -1,5 +1,7 @@
 import itertools
-import sys
+from typing import Any, Iterator
 from ..base import BaseSolver
 def is_valid(p: str) -> bool:
@ -40,10 +42,8 @@ def find_next_password(p: str) -> str:
    return p
-line = sys.stdin.read().strip()
+class Solver(BaseSolver):
-
+    def solve(self, input: str) -> Iterator[Any]:
-answer_1 = find_next_password(line)
+        answer_1 = find_next_password(input)
-print(f"answer 1 is {answer_1}")
+        yield answer_1
-
+        yield find_next_password(increment(answer_1))
 answer_2 = find_next_password(increment(answer_1))
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day12.py
+++ b/src/holt59/aoc/2015/day12.py
@ -1,6 +1,7 @@
 import json
-import sys
+from typing import Any, Iterator, TypeAlias
-from typing import TypeAlias
+
 from ..base import BaseSolver
 JsonObject: TypeAlias = dict[str, "JsonObject"] | list["JsonObject"] | int | str
@ -18,10 +19,9 @@ def json_sum(value: JsonObject, ignore: str | None = None) -> int:
        return 0
-data: JsonObject = json.load(sys.stdin)
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        data: JsonObject = json.loads(input)
-answer_1 = json_sum(data)
+        yield json_sum(data)
-print(f"answer 1 is {answer_1}")
+        yield json_sum(data, "red")
 answer_2 = json_sum(data, "red")
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day13.py
+++ b/src/holt59/aoc/2015/day13.py
@ -1,10 +1,11 @@
 import itertools
 import sys
 from collections import defaultdict
-from typing import Literal, cast
+from typing import Any, Iterator, Literal, cast
 import parse  # type: ignore
 from ..base import BaseSolver
 def max_change_in_happiness(happiness: dict[str, dict[str, int]]) -> int:
    guests = list(happiness)
@ -17,25 +18,23 @@ def max_change_in_happiness(happiness: dict[str, dict[str, int]]) -> int:
    )
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-happiness: dict[str, dict[str, int]] = defaultdict(dict)
+        happiness: dict[str, dict[str, int]] = defaultdict(dict)
-for line in lines:
+        for line in lines:
-    u1, gain_or_loose, hap, u2 = cast(
+            u1, gain_or_loose, hap, u2 = cast(
-        tuple[str, Literal["gain", "lose"], int, str],
+                tuple[str, Literal["gain", "lose"], int, str],
-        parse.parse(  # type: ignore
+                parse.parse(  # type: ignore
-            "{} would {} {:d} happiness units by sitting next to {}.", line
+                    "{} would {} {:d} happiness units by sitting next to {}.", line
-        ),
+                ),
-    )
+            )
-    happiness[u1][u2] = hap if gain_or_loose == "gain" else -hap
+            happiness[u1][u2] = hap if gain_or_loose == "gain" else -hap
        yield max_change_in_happiness(happiness)
        for guest in list(happiness):
            happiness["me"][guest] = 0
            happiness[guest]["me"] = 0
-answer_1 = max_change_in_happiness(happiness)
+        yield max_change_in_happiness(happiness)
 print(f"answer 1 is {answer_1}")
 for guest in list(happiness):
    happiness["me"][guest] = 0
    happiness[guest]["me"] = 0
 answer_2 = max_change_in_happiness(happiness)
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day14.py
+++ b/src/holt59/aoc/2015/day14.py
@ -1,9 +1,10 @@
 import sys
 from dataclasses import dataclass
-from typing import Literal, cast
+from typing import Any, Iterator, Literal, cast
 import parse  # type: ignore
 from ..base import BaseSolver
@dataclass(frozen=True)
 class Reindeer:
@ -13,50 +14,50 @@ class Reindeer:
    rest_time: int
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-reindeers: list[Reindeer] = []
+        reindeers: list[Reindeer] = []
-for line in lines:
+        for line in lines:
-    reindeer, speed, speed_time, rest_time = cast(
+            reindeer, speed, speed_time, rest_time = cast(
-        tuple[str, int, int, int],
+                tuple[str, int, int, int],
-        parse.parse(  # type: ignore
+                parse.parse(  # type: ignore
-            "{} can fly {:d} km/s for {:d} seconds, "
+                    "{} can fly {:d} km/s for {:d} seconds, "
-            "but then must rest for {:d} seconds.",
+                    "but then must rest for {:d} seconds.",
-            line,
+                    line,
-        ),
+                ),
-    )
+            )
-    reindeers.append(
+            reindeers.append(
-        Reindeer(name=reindeer, speed=speed, fly_time=speed_time, rest_time=rest_time)
+                Reindeer(
-    )
+                    name=reindeer, speed=speed, fly_time=speed_time, rest_time=rest_time
                )
            )
-target = 1000 if len(reindeers) <= 2 else 2503
+        target = 1000 if len(reindeers) <= 2 else 2503
-states: dict[Reindeer, tuple[Literal["resting", "flying"], int]] = {
+        states: dict[Reindeer, tuple[Literal["resting", "flying"], int]] = {
-    reindeer: ("resting", 0) for reindeer in reindeers
+            reindeer: ("resting", 0) for reindeer in reindeers
-}
+        }
-distances: dict[Reindeer, int] = {reindeer: 0 for reindeer in reindeers}
+        distances: dict[Reindeer, int] = {reindeer: 0 for reindeer in reindeers}
-points: dict[Reindeer, int] = {reindeer: 0 for reindeer in reindeers}
+        points: dict[Reindeer, int] = {reindeer: 0 for reindeer in reindeers}
-for time in range(target):
+        for time in self.progress.wrap(range(target)):
-    for reindeer in reindeers:
+            for reindeer in reindeers:
-        if states[reindeer][0] == "flying":
+                if states[reindeer][0] == "flying":
-            distances[reindeer] += reindeer.speed
+                    distances[reindeer] += reindeer.speed
-    top_distance = max(distances.values())
+            top_distance = max(distances.values())
-    for reindeer in reindeers:
+            for reindeer in reindeers:
-        if distances[reindeer] == top_distance:
+                if distances[reindeer] == top_distance:
-            points[reindeer] += 1
+                    points[reindeer] += 1
-    for reindeer in reindeers:
+            for reindeer in reindeers:
-        if states[reindeer][1] == time:
+                if states[reindeer][1] == time:
-            if states[reindeer][0] == "resting":
+                    if states[reindeer][0] == "resting":
-                states[reindeer] = ("flying", time + reindeer.fly_time)
+                        states[reindeer] = ("flying", time + reindeer.fly_time)
-            else:
+                    else:
-                states[reindeer] = ("resting", time + reindeer.rest_time)
+                        states[reindeer] = ("resting", time + reindeer.rest_time)
-
+        yield max(distances.values())
-answer_1 = max(distances.values())
+        yield max(points.values()) - 1
 print(f"answer 1 is {answer_1}")
 answer_2 = max(points.values()) - 1
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day15.py
+++ b/src/holt59/aoc/2015/day15.py
@ -1,9 +1,10 @@
 import math
-import sys
+from typing import Any, Iterator, Sequence, cast
 from typing import Sequence, cast
 import parse  # type: ignore
 from ..base import BaseSolver
 def score(ingredients: list[list[int]], teaspoons: Sequence[int]) -> int:
    return math.prod(
@ -18,40 +19,38 @@ def score(ingredients: list[list[int]], teaspoons: Sequence[int]) -> int:
    )
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-ingredients: list[list[int]] = []
+        ingredients: list[list[int]] = []
-for line in lines:
+        for line in lines:
-    _, *scores = cast(
+            _, *scores = cast(
-        tuple[str, int, int, int, int, int],
+                tuple[str, int, int, int, int, int],
-        parse.parse(  # type: ignore
+                parse.parse(  # type: ignore
-            "{}: capacity {:d}, durability {:d}, flavor {:d}, "
+                    "{}: capacity {:d}, durability {:d}, flavor {:d}, "
-            "texture {:d}, calories {:d}",
+                    "texture {:d}, calories {:d}",
-            line,
+                    line,
-        ),
+                ),
    )
    ingredients.append(scores)
 total_teaspoons = 100
 calories: list[int] = []
 scores: list[int] = []
 for a in range(total_teaspoons + 1):
    for b in range(total_teaspoons + 1 - a):
        for c in range(total_teaspoons + 1 - a - b):
            teaspoons = (a, b, c, total_teaspoons - a - b - c)
            scores.append(score(ingredients, teaspoons))
            calories.append(
                sum(
                    ingredient[-1] * teaspoon
                    for ingredient, teaspoon in zip(ingredients, teaspoons)
                )
            )
            ingredients.append(scores)
        total_teaspoons = 100
        calories: list[int] = []
        scores: list[int] = []
-answer_1 = max(scores)
+        for a in range(total_teaspoons + 1):
-print(f"answer 1 is {answer_1}")
+            for b in range(total_teaspoons + 1 - a):
                for c in range(total_teaspoons + 1 - a - b):
                    teaspoons = (a, b, c, total_teaspoons - a - b - c)
-answer_2 = max(score for score, calory in zip(scores, calories) if calory == 500)
+                    scores.append(score(ingredients, teaspoons))
-print(f"answer 2 is {answer_2}")
+                    calories.append(
                        sum(
                            ingredient[-1] * teaspoon
                            for ingredient, teaspoon in zip(ingredients, teaspoons)
                        )
                    )
        yield max(scores)
        yield max(score for score, calory in zip(scores, calories) if calory == 500)
--- a/src/holt59/aoc/2015/day16.py
+++ b/src/holt59/aoc/2015/day16.py
@ -1,8 +1,9 @@
 import operator as op
 import re
 import sys
 from collections import defaultdict
-from typing import Callable
+from typing import Any, Callable, Iterator
 from ..base import BaseSolver
 MFCSAM: dict[str, int] = {
    "children": 3,
@ -17,18 +18,10 @@ MFCSAM: dict[str, int] = {
    "perfumes": 1,
 }
 lines = sys.stdin.readlines()
-aunts: list[dict[str, int]] = [
+def match(
-    {
+    aunts: list[dict[str, int]], operators: dict[str, Callable[[int, int], bool]]
-        match[1]: int(match[2])
+) -> int:
        for match in re.findall(R"((?P<compound>[^:, ]+): (?P<quantity>\d+))", line)
    }
    for line in lines
 ]
 def match(operators: dict[str, Callable[[int, int], bool]]) -> int:
    return next(
        i
        for i, aunt in enumerate(aunts, start=1)
@ -36,16 +29,29 @@ def match(operators: dict[str, Callable[[int, int], bool]]) -> int:
    )
-answer_1 = match(defaultdict(lambda: op.eq))
+class Solver(BaseSolver):
-print(f"answer 1 is {answer_1}")
+    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-answer_2 = match(
+        aunts: list[dict[str, int]] = [
-    defaultdict(
+            {
-        lambda: op.eq,
+                match[1]: int(match[2])
-        trees=op.gt,
+                for match in re.findall(
-        cats=op.gt,
+                    R"((?P<compound>[^:, ]+): (?P<quantity>\d+))", line
-        pomeranians=op.lt,
+                )
-        goldfish=op.lt,
+            }
-    )
+            for line in lines
-)
+        ]
-print(f"answer 2 is {answer_2}")
+
        yield match(aunts, defaultdict(lambda: op.eq))
        yield match(
            aunts,
            defaultdict(
                lambda: op.eq,
                trees=op.gt,
                cats=op.gt,
                pomeranians=op.lt,
                goldfish=op.lt,
            ),
        )
--- a/src/holt59/aoc/2015/day17.py
+++ b/src/holt59/aoc/2015/day17.py
@ -1,5 +1,6 @@
-import sys
+from typing import Any, Iterator
-from typing import Iterator
+
 from ..base import BaseSolver
 def iter_combinations(value: int, containers: list[int]) -> Iterator[tuple[int, ...]]:
@ -16,15 +17,18 @@ def iter_combinations(value: int, containers: list[int]) -> Iterator[tuple[int,
            yield (containers[i],) + combination
-containers = [int(c) for c in sys.stdin.read().split()]
+class Solver(BaseSolver):
-total = 25 if len(containers) <= 5 else 150
+    def solve(self, input: str) -> Iterator[Any]:
        containers = [int(c) for c in input.split()]
        total = 25 if len(containers) <= 5 else 150
-combinations = [combination for combination in iter_combinations(total, containers)]
+        combinations = [
            combination for combination in iter_combinations(total, containers)
        ]
-answer_1 = len(combinations)
+        yield len(combinations)
 print(f"answer 1 is {answer_1}")
-min_containers = min(len(combination) for combination in combinations)
+        min_containers = min(len(combination) for combination in combinations)
-
+        yield sum(
-answer_2 = sum(1 for combination in combinations if len(combination) == min_containers)
+            1 for combination in combinations if len(combination) == min_containers
-print(f"answer 2 is {answer_2}")
+        )
--- a/src/holt59/aoc/2015/day18.py
+++ b/src/holt59/aoc/2015/day18.py
@ -1,66 +1,66 @@
 import itertools
-import sys
+from typing import Any, Iterator
 import numpy as np
 from numpy.typing import NDArray
-grid0 = np.array([[c == "#" for c in line] for line in sys.stdin.read().splitlines()])
+from ..base import BaseSolver
-# add an always off circle around
+
-grid0 = np.concatenate(
+class Solver(BaseSolver):
-    [
+    def solve(self, input: str) -> Iterator[Any]:
-        np.zeros((grid0.shape[0] + 2, 1), dtype=bool),
+        grid0 = np.array([[c == "#" for c in line] for line in input.splitlines()])
-        np.concatenate(
+
        # add an always off circle around
        grid0 = np.concatenate(
            [
-                np.zeros((1, grid0.shape[1]), dtype=bool),
+                np.zeros((grid0.shape[0] + 2, 1), dtype=bool),
-                grid0,
+                np.concatenate(
-                np.zeros((1, grid0.shape[1]), dtype=bool),
+                    [
-            ]
+                        np.zeros((1, grid0.shape[1]), dtype=bool),
-        ),
+                        grid0,
-        np.zeros((grid0.shape[0] + 2, 1), dtype=bool),
+                        np.zeros((1, grid0.shape[1]), dtype=bool),
-    ],
+                    ]
-    axis=1,
+                ),
-)
+                np.zeros((grid0.shape[0] + 2, 1), dtype=bool),
            ],
            axis=1,
        )
-moves = list(itertools.product([-1, 0, 1], repeat=2))
+        moves = list(itertools.product([-1, 0, 1], repeat=2))
-moves.remove((0, 0))
+        moves.remove((0, 0))
-jjs, iis = np.meshgrid(
+        jjs, iis = np.meshgrid(
-    np.arange(1, grid0.shape[0] - 1, dtype=int),
+            np.arange(1, grid0.shape[0] - 1, dtype=int),
-    np.arange(1, grid0.shape[1] - 1, dtype=int),
+            np.arange(1, grid0.shape[1] - 1, dtype=int),
-)
+        )
-iis, jjs = iis.flatten(), jjs.flatten()
+        iis, jjs = iis.flatten(), jjs.flatten()
-ins = iis[:, None] + np.array(moves)[:, 0]
+        ins = iis[:, None] + np.array(moves)[:, 0]
-jns = jjs[:, None] + np.array(moves)[:, 1]
+        jns = jjs[:, None] + np.array(moves)[:, 1]
        def game_of_life(grid: NDArray[np.bool_]) -> NDArray[np.bool_]:
            neighbors_on = grid[ins, jns].sum(axis=1)
            cells_on = grid[iis, jjs]
-def game_of_life(grid: NDArray[np.bool_]) -> NDArray[np.bool_]:
+            grid = np.zeros_like(grid)
-    neighbors_on = grid[ins, jns].sum(axis=1)
+            grid[iis, jjs] = (neighbors_on == 3) | (cells_on & (neighbors_on == 2))
    cells_on = grid[iis, jjs]
-    grid = np.zeros_like(grid)
+            return grid
    grid[iis, jjs] = (neighbors_on == 3) | (cells_on & (neighbors_on == 2))
-    return grid
+        grid = grid0
        n_steps = 4 if len(grid) < 10 else 100
        for _ in range(n_steps):
            grid = game_of_life(grid)
        yield grid.sum()
-grid = grid0
+        n_steps = 5 if len(grid) < 10 else 100
-n_steps = 4 if len(grid) < 10 else 100
+        grid = grid0
-for _ in range(n_steps):
+        for _ in range(n_steps):
-    grid = game_of_life(grid)
+            grid[[1, 1, -2, -2], [1, -2, 1, -2]] = True
            grid = game_of_life(grid)
-answer_1 = grid.sum()
+        grid[[1, 1, -2, -2], [1, -2, 1, -2]] = True
 print(f"answer 1 is {answer_1}")
-
+        yield sum(cell for line in grid for cell in line)
 n_steps = 5 if len(grid) < 10 else 100
 grid = grid0
 for _ in range(n_steps):
    grid[[1, 1, -2, -2], [1, -2, 1, -2]] = True
    grid = game_of_life(grid)
 grid[[1, 1, -2, -2], [1, -2, 1, -2]] = True
 answer_2 = sum(cell for line in grid for cell in line)
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day19.py
+++ b/src/holt59/aoc/2015/day19.py
@ -1,56 +1,57 @@
 import sys
 from collections import defaultdict
 from typing import Any, Iterator
-replacements_s, molecule = sys.stdin.read().split("\n\n")
+from ..base import BaseSolver
 REPLACEMENTS: dict[str, list[str]] = defaultdict(list)
 for replacement_s in replacements_s.splitlines():
    p = replacement_s.split(" => ")
    REPLACEMENTS[p[0]].append(p[1])
 molecule = molecule.strip()
 generated = [
    molecule[:i] + replacement + molecule[i + len(symbol) :]
    for symbol, replacements in REPLACEMENTS.items()
    for replacement in replacements
    for i in range(len(molecule))
    if molecule[i:].startswith(symbol)
 ]
 answer_1 = len(set(generated))
 print(f"answer 1 is {answer_1}")
 inversion: dict[str, str] = {
    replacement: symbol
    for symbol, replacements in REPLACEMENTS.items()
    for replacement in replacements
 }
 # there is actually only one way to create the molecule, and we can greedily replace
 # tokens with their replacements, e.g., if H => OH then we can replace OH by H directly
 # without thinking
 count = 0
 while molecule != "e":
    i = 0
    m2 = ""
    while i < len(molecule):
        found = False
        for replacement in inversion:
            if molecule[i:].startswith(replacement):
                m2 += inversion[replacement]
                i += len(replacement)
                count += 1
                found = True
                break
        if not found:
            m2 += molecule[i]
            i += 1
    # print(m2)
    molecule = m2
-answer_2 = count
+class Solver(BaseSolver):
-print(f"answer 2 is {count}")
+    def solve(self, input: str) -> Iterator[Any]:
        replacements_s, molecule = input.split("\n\n")
        REPLACEMENTS: dict[str, list[str]] = defaultdict(list)
        for replacement_s in replacements_s.splitlines():
            p = replacement_s.split(" => ")
            REPLACEMENTS[p[0]].append(p[1])
        molecule = molecule.strip()
        generated = [
            molecule[:i] + replacement + molecule[i + len(symbol) :]
            for symbol, replacements in REPLACEMENTS.items()
            for replacement in replacements
            for i in range(len(molecule))
            if molecule[i:].startswith(symbol)
        ]
        yield len(set(generated))
        inversion: dict[str, str] = {
            replacement: symbol
            for symbol, replacements in REPLACEMENTS.items()
            for replacement in replacements
        }
        # there is actually only one way to create the molecule, and we can greedily replace
        # tokens with their replacements, e.g., if H => OH then we can replace OH by H directly
        # without thinking
        count = 0
        while molecule != "e":
            i = 0
            m2 = ""
            while i < len(molecule):
                found = False
                for replacement in inversion:
                    if molecule[i:].startswith(replacement):
                        m2 += inversion[replacement]
                        i += len(replacement)
                        count += 1
                        found = True
                        break
                if not found:
                    m2 += molecule[i]
                    i += 1
            molecule = m2
        yield count
--- a/src/holt59/aoc/2015/day2.py
+++ b/src/holt59/aoc/2015/day2.py
@ -1,20 +1,24 @@
-import sys
+from typing import Any, Iterator
 import numpy as np
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 length, width, height = np.array(
    [[int(c) for c in line.split("x")] for line in lines]
 ).T
-lw, wh, hl = (length * width, width * height, height * length)
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        length, width, height = np.array(
            [[int(c) for c in line.split("x")] for line in input.splitlines()]
        ).T
-answer_1 = np.sum(2 * (lw + wh + hl) + np.min(np.stack([lw, wh, hl]), axis=0))
+        lw, wh, hl = (length * width, width * height, height * length)
 print(f"answer 1 is {answer_1}")
-answer_2 = np.sum(
+        yield np.sum(2 * (lw + wh + hl) + np.min(np.stack([lw, wh, hl]), axis=0))
-    length * width * height
+
-    + 2 * np.min(np.stack([length + width, length + height, height + width]), axis=0)
+        yield np.sum(
-)
+            length * width * height
-print(f"answer 2 is {answer_2}")
+            + 2
            * np.min(
                np.stack([length + width, length + height, height + width]), axis=0
            )
        )
--- a/src/holt59/aoc/2015/day20.py
+++ b/src/holt59/aoc/2015/day20.py
@ -1,10 +1,10 @@
 import itertools
-import sys
+from typing import Any, Iterator
-target = int(sys.stdin.read())
+from ..base import BaseSolver
-def presents(n: int, elf: int, max: int = target) -> int:
+def presents(n: int, elf: int, max: int) -> int:
    count = 0
    k = 1
    while k * k < n:
@ -21,8 +21,9 @@ def presents(n: int, elf: int, max: int = target) -> int:
    return count
-answer_1 = next(n for n in itertools.count(1) if presents(n, 10) >= target)
+class Solver(BaseSolver):
-print(f"answer 1 is {answer_1}")
+    def solve(self, input: str) -> Iterator[Any]:
        target = int(input)
-answer_2 = next(n for n in itertools.count(1) if presents(n, 11, 50) >= target)
+        yield next(n for n in itertools.count(1) if presents(n, 10, target) >= target)
-print(f"answer 2 is {answer_2}")
+        yield next(n for n in itertools.count(1) if presents(n, 11, 50) >= target)
--- a/src/holt59/aoc/2015/day21.py
+++ b/src/holt59/aoc/2015/day21.py
@ -1,7 +1,8 @@
 import itertools
 import sys
 from math import ceil
-from typing import TypeAlias
+from typing import Any, Iterator, TypeAlias
 from ..base import BaseSolver
 Modifier: TypeAlias = tuple[str, int, int, int]
@ -33,34 +34,31 @@ RINGS: list[Modifier] = [
 ]
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-player_hp = 100
+        player_hp = 100
-boss_attack = int(lines[1].split(":")[1].strip())
+        boss_attack = int(lines[1].split(":")[1].strip())
-boss_armor = int(lines[2].split(":")[1].strip())
+        boss_armor = int(lines[2].split(":")[1].strip())
-boss_hp = int(lines[0].split(":")[1].strip())
+        boss_hp = int(lines[0].split(":")[1].strip())
        min_cost, max_cost = 1_000_000, 0
        for equipments in itertools.product(WEAPONS, ARMORS, RINGS, RINGS):
            if equipments[-1][0] != "" and equipments[-2] == equipments[-1]:
                continue
-min_cost, max_cost = 1_000_000, 0
+            cost, player_attack, player_armor = (
-for equipments in itertools.product(WEAPONS, ARMORS, RINGS, RINGS):
+                sum(equipment[1:][k] for equipment in equipments) for k in range(3)
-    if equipments[-1][0] != "" and equipments[-2] == equipments[-1]:
+            )
        continue
-    cost, player_attack, player_armor = (
+            if ceil(boss_hp / max(1, player_attack - boss_armor)) <= ceil(
-        sum(equipment[1:][k] for equipment in equipments) for k in range(3)
+                player_hp / max(1, boss_attack - player_armor)
-    )
+            ):
                min_cost = min(cost, min_cost)
            else:
                max_cost = max(cost, max_cost)
-    if ceil(boss_hp / max(1, player_attack - boss_armor)) <= ceil(
+        yield min_cost
-        player_hp / max(1, boss_attack - player_armor)
+        yield max_cost
    ):
        min_cost = min(cost, min_cost)
    else:
        max_cost = max(cost, max_cost)
 answer_1 = min_cost
 print(f"answer 1 is {answer_1}")
 answer_2 = max_cost
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day22.py
+++ b/src/holt59/aoc/2015/day22.py
@ -1,8 +1,9 @@
 from __future__ import annotations
 import heapq
-import sys
+from typing import Any, Iterator, Literal, TypeAlias, cast
-from typing import Literal, TypeAlias, cast
+
 from ..base import BaseSolver
 PlayerType: TypeAlias = Literal["player", "boss"]
 SpellType: TypeAlias = Literal["magic missile", "drain", "shield", "poison", "recharge"]
@ -62,17 +63,6 @@ def play(
            continue
        visited.add((player, player_hp, player_mana, player_armor, boss_hp, buffs))
        if hard_mode and player == "player":
            player_hp = max(0, player_hp - 1)
        if player_hp == 0:
            continue
        if boss_hp == 0:
            winning_node = spells
            continue
        new_buffs: list[tuple[BuffType, int]] = []
        for buff, length in buffs:
            length = length - 1
@ -88,6 +78,16 @@ def play(
            if length > 0:
                new_buffs.append((buff, length))
        if hard_mode and player == "player":
            player_hp = player_hp - 1
        if player_hp <= 0:
            continue
        if boss_hp <= 0:
            winning_node = spells
            continue
        buffs = tuple(new_buffs)
        if player == "boss":
@ -155,23 +155,27 @@ def play(
    return winning_node
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-player_hp = 50
+        player_hp = 50
-player_mana = 500
+        player_mana = 500
-player_armor = 0
+        player_armor = 0
-boss_hp = int(lines[0].split(":")[1].strip())
+        boss_hp = int(lines[0].split(":")[1].strip())
-boss_attack = int(lines[1].split(":")[1].strip())
+        boss_attack = int(lines[1].split(":")[1].strip())
-answer_1 = sum(
+        yield sum(
-    c
+            c
-    for _, c in play(player_hp, player_mana, player_armor, boss_hp, boss_attack, False)
+            for _, c in play(
-)
+                player_hp, player_mana, player_armor, boss_hp, boss_attack, False
-print(f"answer 1 is {answer_1}")
+            )
        )
-# 1242 (not working)
+        yield sum(
-answer_2 = sum(
+            c
-    c for _, c in play(player_hp, player_mana, player_armor, boss_hp, boss_attack, True)
+            for _, c in play(
-)
+                player_hp, player_mana, player_armor, boss_hp, boss_attack, True
-print(f"answer 2 is {answer_2}")
+            )
        )
--- a/src/holt59/aoc/2015/day23.py
+++ b/src/holt59/aoc/2015/day23.py
@ -0,0 +1,107 @@
 import inspect
 from typing import Any, Callable, Final, Iterator, Mapping
 from ..base import BaseSolver
 class Instruction:
    def __init__(self, fn: Callable[..., None]):
        self._fn = fn
        args = inspect.getfullargspec(fn)
        self._argtypes = [args.annotations[arg] for arg in args.args[1:]]
    def __call__(self, args: tuple[str, ...]):
        self._fn(
            *(argtype(arg) for arg, argtype in zip(args, self._argtypes, strict=True))
        )
 class Machine:
    def __init__(
        self, instructions: list[str], registers: dict[str, int] = {"a": 0, "b": 1}
    ):
        self.instructions: Final = [
            (part[0], tuple(arg.strip() for arg in " ".join(part[1:]).split(",")))
            for instruction in instructions
            if (part := instruction.split())
        ]
        self._fns = {
            name: Instruction(getattr(self, name))
            for name in ("hlf", "tpl", "inc", "jmp", "jie", "jio")
        }
        self._registers = registers.copy()
        self._ip = 0
    @property
    def registers(self) -> Mapping[str, int]:
        return self._registers
    @property
    def ip(self) -> int:
        return self._ip
    def reset(self, registers: dict[str, int] = {"a": 0, "b": 0}):
        self._registers = registers.copy()
        self._ip = 0
    def hlf(self, register: str):
        self._registers[register] //= 2
        self._ip += 1
    def tpl(self, register: str):
        self._registers[register] *= 3
        self._ip += 1
    def inc(self, register: str):
        self._registers[register] += 1
        self._ip += 1
    def jmp(self, offset: int):
        self._ip += offset
        assert 0 <= self._ip < len(self.instructions)
    def jie(self, register: str, offset: int):
        if self._registers[register] % 2 == 0:
            self._ip += offset
        else:
            self._ip += 1
    def jio(self, register: str, offset: int):
        if self._registers[register] == 1:
            self._ip += offset
        else:
            self._ip += 1
    def _exec(self) -> bool:
        # execute next instruction
        if self._ip >= len(self.instructions):
            return False
        ins, args = self.instructions[self._ip]
        if ins not in self._fns:
            return False
        self._fns[ins](args)
        return True
    def run(self):
        while self._exec():
            ...
        return self.registers
 class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        machine = Machine(input.splitlines())
        registers = machine.run()
        yield registers["b"]
        machine.reset({"a": 1, "b": 0})
        registers = machine.run()
        yield registers["b"]
--- a/src/holt59/aoc/2015/day24.py
+++ b/src/holt59/aoc/2015/day24.py
@ -0,0 +1,88 @@
 from typing import Any, Iterator, TypeAlias
 from ..base import BaseSolver
 TupleOfInts: TypeAlias = tuple[int, ...]
 def check_n_groups(
    target: int, groups: tuple[TupleOfInts, ...], numbers: TupleOfInts
 ) -> bool:
    n_groups = len(groups)
    groups_s = tuple(sum(group) for group in groups)
    if all(target == group_s for group_s in groups_s):
        return not numbers
    if not numbers:
        return False
    head, *tail_l = numbers
    tail, tail_s = tuple(tail_l), sum(tail_l)
    return any(
        groups_s[i] + head <= target
        and sum(groups_s[j] for j in range(len(groups)) if i != j) + tail_s
        >= (n_groups - 1) * target
        and check_n_groups(
            target, groups[:i] + ((groups[i] + (head,)),) + groups[i + 1 :], tail
        )
        for i in range(len(groups))
    )
 def enumerate_single_subset(
    target: int, numbers: TupleOfInts
 ) -> Iterator[tuple[int, TupleOfInts, TupleOfInts]]:
    """
    Enumerate subset of numbers whose sum equals target.
    Subset are enumerated in increasing order of length, then product (quantum value).
    Args:
        target: Target for the sum of the subset.
        numbers: Tuple of integers to find the subset from.
    Returns:
        A generator (quantum, subset, remaining) where subset if the subset of numbers
        whose sum equals target, quantum the product of the subset, and remaining the
        remaining numbers.
    """
    groups: list[tuple[int, TupleOfInts, TupleOfInts]] = [(1, (), numbers)]
    for _ in range(len(numbers)):
        new_groups: list[tuple[int, TupleOfInts, TupleOfInts]] = []
        for g_quantum, group, remaining in groups:
            sg = sum(group)
            for i in range(len(remaining)):
                if group and remaining[i] <= group[-1]:
                    continue
                uv = remaining[:i] + remaining[i + 1 :]
                kv = g_quantum * remaining[i], group + (remaining[i],), uv
                if sg + remaining[i] == target:
                    yield kv
                elif sg + remaining[i] < target:
                    new_groups.append(kv)
        groups = new_groups
 def find_min_quantum(numbers: tuple[int, ...], n_groups: int):
    return next(
        g_quantum
        for g_quantum, group_1v2, group_234v2 in enumerate_single_subset(
            sum(numbers) // n_groups, numbers
        )
        if check_n_groups(sum(group_1v2), ((),) * (n_groups - 1), group_234v2)
    )
 class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        numbers = tuple(map(int, input.split()))
        yield find_min_quantum(numbers, 3)
        yield find_min_quantum(numbers, 4)
--- a/src/holt59/aoc/2015/day25.py
+++ b/src/holt59/aoc/2015/day25.py
@ -0,0 +1,16 @@
 import re
 from typing import Any, Iterator
 from ..base import BaseSolver
 from ..tools.math import pow_mod
 class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        m = re.search(r"row\s*([0-9]+)\s*,\s*column\s*([0-9]+)", input)
        assert m is not None
        row, col = int(m.group(1)), int(m.group(2))
        n = (row * (row - 1)) // 2 + col * (col + 1) // 2 + (row - 1) * (col - 1)
        yield (20151125 * pow_mod(252533, n - 1, 33554393)) % 33554393
--- a/src/holt59/aoc/2015/day3.py
+++ b/src/holt59/aoc/2015/day3.py
@ -1,7 +1,7 @@
 import sys
 from collections import defaultdict
 from typing import Any, Iterator
-line = sys.stdin.read().strip()
+from ..base import BaseSolver
 def process(directions: str) -> dict[tuple[int, int], int]:
@ -27,8 +27,7 @@ def process(directions: str) -> dict[tuple[int, int], int]:
    return counts
-answer_1 = len(process(line))
+class Solver(BaseSolver):
-print(f"answer 1 is {answer_1}")
+    def solve(self, input: str) -> Iterator[Any]:
-
+        yield len(process(input))
-answer_2 = len(process(line[::2]) | process(line[1::2]))
+        yield len(process(input[::2]) | process(input[1::2]))
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day4.py
+++ b/src/holt59/aoc/2015/day4.py
@ -1,16 +1,20 @@
 import hashlib
 import itertools
-import sys
+from typing import Any, Iterator
-line = sys.stdin.read().strip()
+from ..base import BaseSolver
 it = iter(itertools.count(1))
 answer_1 = next(
    i for i in it if hashlib.md5(f"{line}{i}".encode()).hexdigest().startswith("00000")
 )
 print(f"answer 1 is {answer_1}")
-answer_2 = next(
+class Solver(BaseSolver):
-    i for i in it if hashlib.md5(f"{line}{i}".encode()).hexdigest().startswith("000000")
+    def solve(self, input: str) -> Iterator[Any]:
-)
+        it = iter(itertools.count(1))
-print(f"answer 2 is {answer_2}")
+        yield next(
            i
            for i in it
            if hashlib.md5(f"{input}{i}".encode()).hexdigest().startswith("00000")
        )
        yield next(
            i
            for i in it
            if hashlib.md5(f"{input}{i}".encode()).hexdigest().startswith("000000")
        )
--- a/src/holt59/aoc/2015/day5.py
+++ b/src/holt59/aoc/2015/day5.py
@ -1,4 +1,6 @@
-import sys
+from typing import Any, Iterator
 from ..base import BaseSolver
 VOWELS = "aeiou"
 FORBIDDEN = {"ab", "cd", "pq", "xy"}
@ -27,10 +29,8 @@ def is_nice_2(s: str) -> bool:
    return True
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
-
+    def solve(self, input: str) -> Iterator[Any]:
-answer_1 = sum(map(is_nice_1, lines))
+        lines = input.splitlines()
-print(f"answer 1 is {answer_1}")
+        yield sum(map(is_nice_1, lines))
-
+        yield sum(map(is_nice_2, lines))
 answer_2 = sum(map(is_nice_2, lines))
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day6.py
+++ b/src/holt59/aoc/2015/day6.py
@ -1,33 +1,32 @@
-import sys
+from typing import Any, Iterator, Literal, cast
 from typing import Literal, cast
 import numpy as np
 import parse  # type: ignore
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 lights_1 = np.zeros((1000, 1000), dtype=bool)
 lights_2 = np.zeros((1000, 1000), dtype=int)
 for line in lines:
    action, sx, sy, ex, ey = cast(
        tuple[Literal["turn on", "turn off", "toggle"], int, int, int, int],
        parse.parse("{} {:d},{:d} through {:d},{:d}", line),  # type: ignore
    )
    ex, ey = ex + 1, ey + 1
-    match action:
+class Solver(BaseSolver):
-        case "turn on":
+    def solve(self, input: str) -> Iterator[Any]:
-            lights_1[sx:ex, sy:ey] = True
+        lights_1 = np.zeros((1000, 1000), dtype=bool)
-            lights_2[sx:ex, sy:ey] += 1
+        lights_2 = np.zeros((1000, 1000), dtype=int)
-        case "turn off":
+        for line in input.splitlines():
-            lights_1[sx:ex, sy:ey] = False
+            action, sx, sy, ex, ey = cast(
-            lights_2[sx:ex, sy:ey] = np.maximum(lights_2[sx:ex, sy:ey] - 1, 0)
+                tuple[Literal["turn on", "turn off", "toggle"], int, int, int, int],
-        case "toggle":
+                parse.parse("{} {:d},{:d} through {:d},{:d}", line),  # type: ignore
-            lights_1[sx:ex, sy:ey] = ~lights_1[sx:ex, sy:ey]
+            )
-            lights_2[sx:ex, sy:ey] += 2
+            ex, ey = ex + 1, ey + 1
-answer_1 = lights_1.sum()
+            match action:
-print(f"answer 1 is {answer_1}")
+                case "turn on":
                    lights_1[sx:ex, sy:ey] = True
                    lights_2[sx:ex, sy:ey] += 1
                case "turn off":
                    lights_1[sx:ex, sy:ey] = False
                    lights_2[sx:ex, sy:ey] = np.maximum(lights_2[sx:ex, sy:ey] - 1, 0)
                case "toggle":
                    lights_1[sx:ex, sy:ey] = ~lights_1[sx:ex, sy:ey]
                    lights_2[sx:ex, sy:ey] += 2
-answer_2 = lights_2.sum()
+        yield lights_1.sum()
-print(f"answer 2 is {answer_2}")
+        yield lights_2.sum()
--- a/src/holt59/aoc/2015/day7.py
+++ b/src/holt59/aoc/2015/day7.py
@ -1,11 +1,7 @@
 import logging
 import operator
-import os
+from typing import Any, Callable, Iterator
 import sys
 from typing import Callable
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)
 OPERATORS = {
    "AND": operator.and_,
@ -36,48 +32,6 @@ def value_of(key: str) -> tuple[str, Callable[[dict[str, int]], int]]:
        return key, lambda values: values[key]
 lines = sys.stdin.read().splitlines()
 signals: Signals = {}
 values: dict[str, int] = {"": 0}
 for line in lines:
    command, signal = line.split(" -> ")
    if command.startswith("NOT"):
        name = command.split(" ")[1]
        signals[signal] = (
            (name, ""),
            (lambda values, _n=name: values[_n], lambda _v: 0),
            lambda a, _b: ~a,
        )
    elif not any(command.find(name) >= 0 for name in OPERATORS):
        try:
            values[signal] = int(command)
        except ValueError:
            signals[signal] = (
                (command, ""),
                (lambda values, _c=command: values[_c], lambda _v: 0),
                lambda a, _b: a,
            )
    else:
        op: Callable[[int, int], int] = zero_op
        lhs_s, rhs_s = "", ""
        for name in OPERATORS:
            if command.find(name) >= 0:
                op = OPERATORS[name]
                lhs_s, rhs_s = command.split(f" {name} ")
                break
        lhs_s, lhs_fn = value_of(lhs_s)
        rhs_s, rhs_fn = value_of(rhs_s)
        signals[signal] = ((lhs_s, rhs_s), (lhs_fn, rhs_fn), op)
 def process(
    signals: Signals,
    values: dict[str, int],
@ -91,11 +45,52 @@ def process(
    return values
-values_1 = process(signals.copy(), values.copy())
+class Solver(BaseSolver):
-logging.info("\n" + "\n".join(f"{k}: {values_1[k]}" for k in sorted(values_1)))
+    def solve(self, input: str) -> Iterator[Any] | None:
-answer_1 = values_1["a"]
+        lines = input.splitlines()
 print(f"answer 1 is {answer_1}")
-values_2 = process(signals.copy(), values | {"b": values_1["a"]})
+        signals: Signals = {}
-answer_2 = values_2["a"]
+        values: dict[str, int] = {"": 0}
-print(f"answer 2 is {answer_2}")
+
        for line in lines:
            command, signal = line.split(" -> ")
            if command.startswith("NOT"):
                name = command.split(" ")[1]
                signals[signal] = (
                    (name, ""),
                    (lambda values, _n=name: values[_n], lambda _v: 0),
                    lambda a, _b: ~a,
                )
            elif not any(command.find(name) >= 0 for name in OPERATORS):
                try:
                    values[signal] = int(command)
                except ValueError:
                    signals[signal] = (
                        (command, ""),
                        (lambda values, _c=command: values[_c], lambda _v: 0),
                        lambda a, _b: a,
                    )
            else:
                op: Callable[[int, int], int] = zero_op
                lhs_s, rhs_s = "", ""
                for name in OPERATORS:
                    if command.find(name) >= 0:
                        op = OPERATORS[name]
                        lhs_s, rhs_s = command.split(f" {name} ")
                        break
                lhs_s, lhs_fn = value_of(lhs_s)
                rhs_s, rhs_fn = value_of(rhs_s)
                signals[signal] = ((lhs_s, rhs_s), (lhs_fn, rhs_fn), op)
        values_1 = process(signals.copy(), values.copy())
        for k in sorted(values_1):
            self.logger.info(f"{k}: {values_1[k]}")
        yield values_1["a"]
        yield process(signals.copy(), values | {"b": values_1["a"]})["a"]
--- a/src/holt59/aoc/2015/day8.py
+++ b/src/holt59/aoc/2015/day8.py
@ -1,35 +1,32 @@
-import logging
+from typing import Any, Iterator
 import os
 import sys
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-answer_1 = sum(
+        yield sum(
-    # left and right quotes (not in memory)
+            # left and right quotes (not in memory)
-    2
+            2
-    # each \\ adds one character in the literals (compared to memory)
+            # each \\ adds one character in the literals (compared to memory)
-    + line.count(R"\\")
+            + line.count(R"\\")
-    # each \" adds one character in the literals (compared to memory)
+            # each \" adds one character in the literals (compared to memory)
-    + line[1:-1].count(R"\"")
+            + line[1:-1].count(R"\"")
-    # each \xFF adds 3 characters in the literals (compared to memory), but we must not
+            # each \xFF adds 3 characters in the literals (compared to memory), but we must not
-    # count A\\x (A != \), but we must count A\\\x (A != \) - in practice we should also
+            # count A\\x (A != \), but we must count A\\\x (A != \) - in practice we should also
-    # avoid \\\\x, etc., but this does not occur in the examples and the actual input
+            # avoid \\\\x, etc., but this does not occur in the examples and the actual input
-    + 3 * (line.count(R"\x") - line.count(R"\\x") + line.count(R"\\\x"))
+            + 3 * (line.count(R"\x") - line.count(R"\\x") + line.count(R"\\\x"))
-    for line in lines
+            for line in lines
-)
+        )
 print(f"answer 1 is {answer_1}")
-answer_2 = sum(
+        yield sum(
-    # needs to wrap in quotes (2 characters)
+            # needs to wrap in quotes (2 characters)
-    2
+            2
-    # needs to escape every \ with an extra \
+            # needs to escape every \ with an extra \
-    + line.count("\\")
+            + line.count("\\")
-    # needs to escape every " with an extra \ (including the first and last ones)
+            # needs to escape every " with an extra \ (including the first and last ones)
-    + line.count('"')
+            + line.count('"')
-    for line in lines
+            for line in lines
-)
+        )
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2015/day9.py
+++ b/src/holt59/aoc/2015/day9.py
@ -1,27 +1,28 @@
 import itertools
 import sys
 from collections import defaultdict
-from typing import cast
+from typing import Any, Iterator, cast
 import parse  # type: ignore
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 distances: dict[str, dict[str, int]] = defaultdict(dict)
 for line in lines:
    origin, destination, length = cast(
        tuple[str, str, int],
        parse.parse("{} to {} = {:d}", line),  # type: ignore
    )
    distances[origin][destination] = distances[destination][origin] = length
-distance_of_routes = {
+class Solver(BaseSolver):
-    route: sum(distances[o][d] for o, d in zip(route[:-1], route[1:]))
+    def solve(self, input: str) -> Iterator[Any]:
-    for route in map(tuple, itertools.permutations(distances))
+        lines = input.splitlines()
 }
-answer_1 = min(distance_of_routes.values())
+        distances: dict[str, dict[str, int]] = defaultdict(dict)
-print(f"answer 1 is {answer_1}")
+        for line in lines:
            origin, destination, length = cast(
                tuple[str, str, int],
                parse.parse("{} to {} = {:d}", line),  # type: ignore
            )
            distances[origin][destination] = distances[destination][origin] = length
-answer_2 = max(distance_of_routes.values())
+        distance_of_routes = {
-print(f"answer 2 is {answer_2}")
+            route: sum(distances[o][d] for o, d in zip(route[:-1], route[1:]))
            for route in map(tuple, itertools.permutations(distances))
        }
        yield min(distance_of_routes.values())
        yield max(distance_of_routes.values())
--- a/src/holt59/aoc/2021/day1.py
+++ b/src/holt59/aoc/2021/day1.py
@ -1,14 +1,17 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 values = [int(line) for line in lines]
-# part 1
+class Solver(BaseSolver):
-answer_1 = sum(v2 > v1 for v1, v2 in zip(values[:-1], values[1:]))
+    def solve(self, input: str) -> Iterator[Any]:
-print(f"answer 1 is {answer_1}")
+        lines = input.splitlines()
-# part 2
+        values = [int(line) for line in lines]
-runnings = [sum(values[i : i + 3]) for i in range(len(values) - 2)]
+
-answer_2 = sum(v2 > v1 for v1, v2 in zip(runnings[:-1], runnings[1:]))
+        # part 1
-print(f"answer 2 is {answer_2}")
+        yield sum(v2 > v1 for v1, v2 in zip(values[:-1], values[1:]))
        # part 2
        runnings = [sum(values[i : i + 3]) for i in range(len(values) - 2)]
        yield sum(v2 > v1 for v1, v2 in zip(runnings[:-1], runnings[1:]))
--- a/src/holt59/aoc/2021/day10.py
+++ b/src/holt59/aoc/2021/day10.py
@ -1,11 +1,47 @@
-import sys
+from functools import reduce
 from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
-# part 1
+BRACKETS = {"{": "}", "[": "]", "<": ">", "(": ")"}
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+CORRUPT_SCORES = {")": 3, "]": 57, "}": 1197, ">": 25137}
-answer_2 = ...
+COMPLETE_SCORES = {")": 1, "]": 2, "}": 3, ">": 4}
-print(f"answer 2 is {answer_2}")
+
 def corrupted_or_incomplete(line: str) -> tuple[bool, str]:
    opens: list[str] = []
    for c in line:
        if c in BRACKETS:
            opens.append(c)
        elif BRACKETS[opens[-1]] != c:
            return True, c
        else:
            opens.pop()
    return (False, "".join(opens))
 class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
        answer_1: int = 0
        incomplete_scores: list[int] = []
        for line in lines:
            c, r = corrupted_or_incomplete(line)
            if c:
                answer_1 += CORRUPT_SCORES[r]
            else:
                incomplete_scores.append(
                    reduce(
                        lambda s, c: s * 5 + COMPLETE_SCORES[BRACKETS[c]],
                        reversed(r),
                        0,
                    ),
                )
        yield answer_1
        yield sorted(incomplete_scores)[len(incomplete_scores) // 2]
--- a/src/holt59/aoc/2021/day11.py
+++ b/src/holt59/aoc/2021/day11.py
@ -1,11 +1,66 @@
-import sys
+import itertools as it
 from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+def do_step(values: list[list[int]]) -> tuple[list[list[int]], set[tuple[int, int]]]:
-answer_2 = ...
+    values = [[c + 1 for c in r] for r in values]
-print(f"answer 2 is {answer_2}")
+    flashed: set[tuple[int, int]] = set()
    while True:
        found = False
        for i_row, row in enumerate(values):
            for i_col, col in enumerate(row):
                if col <= 9 or (i_row, i_col) in flashed:
                    continue
                found = True
                flashed.add((i_row, i_col))
                for dr, dc in it.product((-1, 0, 1), repeat=2):
                    if 0 <= i_row + dr < len(values) and 0 <= i_col + dc < len(
                        values[0]
                    ):
                        values[i_row + dr][i_col + dc] += 1
        if not found:
            break
    for i, j in flashed:
        values[i][j] = 0
    return values, flashed
 class Solver(BaseSolver):
    def print_grid(self, values: list[list[int]], flashed: set[tuple[int, int]]):
        for i_row, row in enumerate(values):
            s_row = ""
            for i_col, col in enumerate(row):
                if (i_row, i_col) in flashed:
                    s_row += f"\033[0;31m{col}\033[0;00m"
                else:
                    s_row += str(col)
            self.logger.info(s_row)
        self.logger.info("")
    def solve(self, input: str) -> Iterator[Any]:
        values_0 = [[int(c) for c in r] for r in input.splitlines()]
        values = values_0
        total_flashed: int = 0
        for _ in range(100):
            values, flashed = do_step(values)
            total_flashed += len(flashed)
        yield total_flashed
        n_cells = len(values) * len(values[0])
        flashed: set[tuple[int, int]] = set()
        values, step = values_0, 0
        while len(flashed) != n_cells:
            values, flashed = do_step(values)
            step += 1
        yield step
--- a/src/holt59/aoc/2021/day12.py
+++ b/src/holt59/aoc/2021/day12.py
@ -1,11 +1,64 @@
-import sys
+import string
 from collections import defaultdict
 from functools import cache
 from typing import Any, Iterator, Mapping, Sequence
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+@cache
-answer_2 = ...
+def is_small(node: str):
-print(f"answer 2 is {answer_2}")
+    return all(c in string.ascii_lowercase for c in node)
 def enumerate_paths(
    neighbors: Mapping[str, Sequence[str]],
    duplicate_smalls: int = 0,
    start: str = "start",
    current: tuple[str, ...] = ("start",),
 ) -> Iterator[tuple[str, ...]]:
    if start == "end":
        yield current
    for neighbor in neighbors[start]:
        if not is_small(neighbor):
            yield from enumerate_paths(
                neighbors, duplicate_smalls, neighbor, current + (neighbor,)
            )
        elif neighbor not in current:
            yield from enumerate_paths(
                neighbors, duplicate_smalls, neighbor, current + (neighbor,)
            )
        elif duplicate_smalls > 0:
            yield from enumerate_paths(
                neighbors, duplicate_smalls - 1, neighbor, current + (neighbor,)
            )
 class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        neighbors: dict[str, list[str]] = defaultdict(list)
        for row in input.splitlines():
            a, b = row.split("-")
            if a != "end" and b != "start":
                neighbors[a].append(b)
            if b != "end" and a != "start":
                neighbors[b].append(a)
        if self.files:
            graph = "graph {\n"
            for node, neighbors_of in neighbors.items():
                graph += (
                    " ".join(
                        f"{node} -- {neighbor};"
                        for neighbor in neighbors_of
                        if node <= neighbor or node == "start" or neighbor == "end"
                    )
                    + "\n"
                )
            graph += "}\n"
            self.files.create("graph.dot", graph.encode(), False)
        yield len(list(enumerate_paths(neighbors)))
        yield len(list(enumerate_paths(neighbors, 1)))
--- a/src/holt59/aoc/2021/day13.py
+++ b/src/holt59/aoc/2021/day13.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day14.py
+++ b/src/holt59/aoc/2021/day14.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day15.py
+++ b/src/holt59/aoc/2021/day15.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day16.py
+++ b/src/holt59/aoc/2021/day16.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day17.py
+++ b/src/holt59/aoc/2021/day17.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day18.py
+++ b/src/holt59/aoc/2021/day18.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day19.py
+++ b/src/holt59/aoc/2021/day19.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day2.py
+++ b/src/holt59/aoc/2021/day2.py
@ -1,41 +1,38 @@
 import sys
 from math import prod
-from typing import Literal, TypeAlias, cast
+from typing import Any, Iterator, Literal, TypeAlias, cast
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 Command: TypeAlias = Literal["forward", "up", "down"]
 commands: list[tuple[Command, int]] = [
    (cast(Command, (p := line.split())[0]), int(p[1])) for line in lines
 ]
 class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-def depth_and_position(use_aim: bool):
+        commands: list[tuple[Command, int]] = [
-    aim, pos, depth = 0, 0, 0
+            (cast(Command, (p := line.split())[0]), int(p[1])) for line in lines
-    for command, value in commands:
+        ]
        d_depth = 0
        match command:
            case "forward":
                pos += value
                depth += value * aim
            case "up":
                d_depth = -value
            case "down":
                d_depth = value
-        if use_aim:
+        def depth_and_position(use_aim: bool):
-            aim += d_depth
+            aim, pos, depth = 0, 0, 0
-        else:
+            for command, value in commands:
-            depth += value
+                d_depth = 0
                match command:
                    case "forward":
                        pos += value
                        depth += value * aim
                    case "up":
                        d_depth = -value
                    case "down":
                        d_depth = value
-    return depth, pos
+                if use_aim:
                    aim += d_depth
                else:
                    depth += value
            return depth, pos
-# part 1
+        yield prod(depth_and_position(False))
-answer_1 = prod(depth_and_position(False))
+        yield prod(depth_and_position(True))
 print(f"answer 1 is {answer_1}")
 # part 2
 answer_2 = prod(depth_and_position(True))
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day20.py
+++ b/src/holt59/aoc/2021/day20.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day21.py
+++ b/src/holt59/aoc/2021/day21.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day22.py
+++ b/src/holt59/aoc/2021/day22.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day23.py
+++ b/src/holt59/aoc/2021/day23.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day24.py
+++ b/src/holt59/aoc/2021/day24.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day25.py
+++ b/src/holt59/aoc/2021/day25.py
@ -1,11 +1,7 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # part 1
 answer_1 = ...
 print(f"answer 1 is {answer_1}")
-# part 2
+class Solver(BaseSolver):
-answer_2 = ...
+    def solve(self, input: str) -> Iterator[Any]: ...
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day3.py
+++ b/src/holt59/aoc/2021/day3.py
@ -1,6 +1,7 @@
 import sys
 from collections import Counter
-from typing import Literal
+from typing import Any, Iterator, Literal
 from ..base import BaseSolver
 def generator_rating(
@ -20,20 +21,23 @@ def generator_rating(
    return values[0]
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
        # part 1
        most_and_least_common = [
            tuple(
                Counter(line[col] for line in lines).most_common(2)[m][0]
                for m in range(2)
            )
            for col in range(len(lines[0]))
        ]
        gamma_rate = int("".join(most for most, _ in most_and_least_common), base=2)
        epsilon_rate = int("".join(least for _, least in most_and_least_common), base=2)
        yield gamma_rate * epsilon_rate
-# part 1
+        # part 2
-most_and_least_common = [
+        oxygen_generator_rating = int(generator_rating(lines, True, "1"), base=2)
-    tuple(Counter(line[col] for line in lines).most_common(2)[m][0] for m in range(2))
+        co2_scrubber_rating = int(generator_rating(lines, False, "0"), base=2)
-    for col in range(len(lines[0]))
+        yield oxygen_generator_rating * co2_scrubber_rating
 ]
 gamma_rate = int("".join(most for most, _ in most_and_least_common), base=2)
 epsilon_rate = int("".join(least for _, least in most_and_least_common), base=2)
 print(f"answer 1 is {gamma_rate * epsilon_rate}")
 # part 2
 oxygen_generator_rating = int(generator_rating(lines, True, "1"), base=2)
 co2_scrubber_rating = int(generator_rating(lines, False, "0"), base=2)
 answer_2 = oxygen_generator_rating * co2_scrubber_rating
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day4.py
+++ b/src/holt59/aoc/2021/day4.py
@ -1,45 +1,52 @@
-import sys
+from typing import Any, Iterator
 import numpy as np
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 numbers = [int(c) for c in lines[0].split(",")]
-boards = np.asarray(
+class Solver(BaseSolver):
-    [
+    def solve(self, input: str) -> Iterator[Any]:
-        [[int(c) for c in line.split()] for line in lines[start : start + 5]]
+        lines = input.splitlines()
        for start in range(2, len(lines), 6)
    ]
 )
-# (round, score) for each board (-1 when not found)
+        numbers = [int(c) for c in lines[0].split(",")]
 winning_rounds: list[tuple[int, int]] = [(-1, -1) for _ in range(len(boards))]
 marked = np.zeros_like(boards, dtype=bool)
-for round, number in enumerate(numbers):
+        boards = np.asarray(
-    # mark boards
+            [
-    marked[boards == number] = True
+                [[int(c) for c in line.split()] for line in lines[start : start + 5]]
                for start in range(2, len(lines), 6)
            ]
        )
-    # check each board for winning
+        # (round, score) for each board (-1 when not found)
-    for index in range(len(boards)):
+        winning_rounds: list[tuple[int, int]] = [(-1, -1) for _ in range(len(boards))]
-        if winning_rounds[index][0] > 0:
+        marked = np.zeros_like(boards, dtype=bool)
            continue
-        if np.any(np.all(marked[index], axis=0) | np.all(marked[index], axis=1)):
+        for round, number in enumerate(numbers):
-            winning_rounds[index] = (
+            # mark boards
-                round,
+            marked[boards == number] = True
                number * int(np.sum(boards[index][~marked[index]])),
            )
-    # all boards are winning - break
+            # check each board for winning
-    if np.all(marked.all(axis=1) | marked.all(axis=2)):
+            for index in range(len(boards)):
-        break
+                if winning_rounds[index][0] > 0:
                    continue
-# part 1
+                if np.any(
-(_, score) = min(winning_rounds, key=lambda w: w[0])
+                    np.all(marked[index], axis=0) | np.all(marked[index], axis=1)
-print(f"answer 1 is {score}")
+                ):
                    winning_rounds[index] = (
                        round,
                        number * int(np.sum(boards[index][~marked[index]])),
                    )
-# part 2
+            # all boards are winning - break
-(_, score) = max(winning_rounds, key=lambda w: w[0])
+            if np.all(marked.all(axis=1) | marked.all(axis=2)):
-print(f"answer 2 is {score}")
+                break
        # part 1
        (_, score) = min(winning_rounds, key=lambda w: w[0])
        yield score
        # part 2
        (_, score) = max(winning_rounds, key=lambda w: w[0])
        yield score
--- a/src/holt59/aoc/2021/day5.py
+++ b/src/holt59/aoc/2021/day5.py
@ -1,48 +1,48 @@
-import sys
+from typing import Any, Iterator
 import numpy as np
-lines: list[str] = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 sections: list[tuple[tuple[int, int], tuple[int, int]]] = [
    (
        (
            int(line.split(" -> ")[0].split(",")[0]),
            int(line.split(" -> ")[0].split(",")[1]),
        ),
        (
            int(line.split(" -> ")[1].split(",")[0]),
            int(line.split(" -> ")[1].split(",")[1]),
        ),
    )
    for line in lines
 ]
-np_sections = np.array(sections).reshape(-1, 4)
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-x_min, x_max, y_min, y_max = (
+        sections: list[tuple[tuple[int, int], tuple[int, int]]] = [
-    min(np_sections[:, 0].min(), np_sections[:, 2].min()),
+            (
-    max(np_sections[:, 0].max(), np_sections[:, 2].max()),
+                (
-    min(np_sections[:, 1].min(), np_sections[:, 3].min()),
+                    int(line.split(" -> ")[0].split(",")[0]),
-    max(np_sections[:, 1].max(), np_sections[:, 3].max()),
+                    int(line.split(" -> ")[0].split(",")[1]),
-)
+                ),
                (
                    int(line.split(" -> ")[1].split(",")[0]),
                    int(line.split(" -> ")[1].split(",")[1]),
                ),
            )
            for line in lines
        ]
-counts_1 = np.zeros((y_max + 1, x_max + 1), dtype=int)
+        np_sections = np.array(sections).reshape(-1, 4)
 counts_2 = counts_1.copy()
-for (x1, y1), (x2, y2) in sections:
+        x_max, y_max = (
-    x_rng = range(x1, x2 + 1, 1) if x2 >= x1 else range(x1, x2 - 1, -1)
+            max(np_sections[:, 0].max(), np_sections[:, 2].max()),
-    y_rng = range(y1, y2 + 1, 1) if y2 >= y1 else range(y1, y2 - 1, -1)
+            max(np_sections[:, 1].max(), np_sections[:, 3].max()),
        )
-    if x1 == x2 or y1 == y2:
+        counts_1 = np.zeros((y_max + 1, x_max + 1), dtype=int)
-        counts_1[list(y_rng), list(x_rng)] += 1
+        counts_2 = counts_1.copy()
        counts_2[list(y_rng), list(x_rng)] += 1
    elif abs(x2 - x1) == abs(y2 - y1):
        for i, j in zip(y_rng, x_rng):
            counts_2[i, j] += 1
-answer_1 = (counts_1 >= 2).sum()
+        for (x1, y1), (x2, y2) in sections:
-print(f"answer 1 is {answer_1}")
+            x_rng = range(x1, x2 + 1, 1) if x2 >= x1 else range(x1, x2 - 1, -1)
            y_rng = range(y1, y2 + 1, 1) if y2 >= y1 else range(y1, y2 - 1, -1)
-answer_2 = (counts_2 >= 2).sum()
+            if x1 == x2 or y1 == y2:
-print(f"answer 2 is {answer_2}")
+                counts_1[list(y_rng), list(x_rng)] += 1
                counts_2[list(y_rng), list(x_rng)] += 1
            elif abs(x2 - x1) == abs(y2 - y1):
                for i, j in zip(y_rng, x_rng):
                    counts_2[i, j] += 1
        yield (counts_1 >= 2).sum()
        yield (counts_2 >= 2).sum()
--- a/src/holt59/aoc/2021/day6.py
+++ b/src/holt59/aoc/2021/day6.py
@ -1,21 +1,21 @@
-import sys
+from typing import Any, Iterator
-values = [int(c) for c in sys.stdin.read().strip().split(",")]
+from ..base import BaseSolver
 days = 256
 lanterns = {day: 0 for day in range(days)}
 for value in values:
    for day in range(value, days, 7):
        lanterns[day] += 1
-for day in range(days):
+class Solver(BaseSolver):
-    for day2 in range(day + 9, days, 7):
+    def solve(self, input: str) -> Iterator[Any]:
-        lanterns[day2] += lanterns[day]
+        values = [int(c) for c in input.split(",")]
-# part 1
+        days = 256
-answer_1 = sum(v for k, v in lanterns.items() if k < 80) + len(values)
+        lanterns = {day: 0 for day in range(days)}
-print(f"answer 1 is {answer_1}")
+        for value in values:
            for day in range(value, days, 7):
                lanterns[day] += 1
-# part 2
+        for day in range(days):
-answer_2 = sum(lanterns.values()) + len(values)
+            for day2 in range(day + 9, days, 7):
-print(f"answer 2 is {answer_2}")
+                lanterns[day2] += lanterns[day]
        yield sum(v for k, v in lanterns.items() if k < 80) + len(values)
        yield sum(lanterns.values()) + len(values)
--- a/src/holt59/aoc/2021/day7.py
+++ b/src/holt59/aoc/2021/day7.py
@ -1,19 +1,22 @@
-import sys
+from typing import Any, Iterator
-positions = [int(c) for c in sys.stdin.read().strip().split(",")]
+from ..base import BaseSolver
 min_position, max_position = min(positions), max(positions)
-# part 1
+class Solver(BaseSolver):
-answer_1 = min(
+    def solve(self, input: str) -> Iterator[Any]:
-    sum(abs(p - position) for p in positions)
+        positions = [int(c) for c in input.split(",")]
    for position in range(min_position, max_position + 1)
 )
 print(f"answer 1 is {answer_1}")
-# part 2
+        min_position, max_position = min(positions), max(positions)
-answer_2 = min(
+
-    sum(abs(p - position) * (abs(p - position) + 1) // 2 for p in positions)
+        # part 1
-    for position in range(min_position, max_position + 1)
+        yield min(
-)
+            sum(abs(p - position) for p in positions)
-print(f"answer 2 is {answer_2}")
+            for position in range(min_position, max_position + 1)
        )
        # part 2
        yield min(
            sum(abs(p - position) * (abs(p - position) + 1) // 2 for p in positions)
            for position in range(min_position, max_position + 1)
        )
--- a/src/holt59/aoc/2021/day8.py
+++ b/src/holt59/aoc/2021/day8.py
@ -1,8 +1,7 @@
 import itertools
-import os
+from typing import Any, Iterator
 import sys
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 digits = {
    "abcefg": 0,
@ -17,71 +16,74 @@ digits = {
    "abcdfg": 9,
 }
 lines = sys.stdin.read().splitlines()
-# part 1
+class Solver(BaseSolver):
-lengths = {len(k) for k, v in digits.items() if v in (1, 4, 7, 8)}
+    def solve(self, input: str) -> Iterator[Any]:
-answer_1 = sum(
+        lines = input.splitlines()
    len(p) in lengths for line in lines for p in line.split("|")[1].strip().split()
 )
 print(f"answer 1 is {answer_1}")
-# part 2
+        # part 1
-values: list[int] = []
+        lengths = {len(k) for k, v in digits.items() if v in (1, 4, 7, 8)}
        yield sum(
            len(p) in lengths
            for line in lines
            for p in line.split("|")[1].strip().split()
        )
-for line in lines:
+        # part 2
-    parts = line.split("|")
+        values: list[int] = []
    broken_digits = sorted(parts[0].strip().split(), key=len)
-    per_length = {
+        for line in lines:
-        k: list(v)
+            parts = line.split("|")
-        for k, v in itertools.groupby(sorted(broken_digits, key=len), key=len)
+            broken_digits = sorted(parts[0].strip().split(), key=len)
    }
-    # a can be found immediately
+            per_length = {
-    a = next(u for u in per_length[3][0] if u not in per_length[2][0])
+                k: list(v)
                for k, v in itertools.groupby(sorted(broken_digits, key=len), key=len)
            }
-    # c and f have only two possible values corresponding to the single entry of
+            # a can be found immediately
-    # length 2
+            a = next(u for u in per_length[3][0] if u not in per_length[2][0])
    cf = list(per_length[2][0])
-    # the only digit of length 4 contains bcdf, so we can deduce bd by removing cf
+            # c and f have only two possible values corresponding to the single entry of
-    bd = [u for u in per_length[4][0] if u not in cf]
+            # length 2
            cf = list(per_length[2][0])
-    # the 3 digits of length 5 have a, d and g in common
+            # the only digit of length 4 contains bcdf, so we can deduce bd by removing cf
-    adg = [u for u in per_length[5][0] if all(u in pe for pe in per_length[5][1:])]
+            bd = [u for u in per_length[4][0] if u not in cf]
-    # we can remove a
+            # the 3 digits of length 5 have a, d and g in common
-    dg = [u for u in adg if u != a]
+            adg = [
                u for u in per_length[5][0] if all(u in pe for pe in per_length[5][1:])
            ]
-    # we can deduce d and g
+            # we can remove a
-    d = next(u for u in dg if u in bd)
+            dg = [u for u in adg if u != a]
    g = next(u for u in dg if u != d)
-    # then b
+            # we can deduce d and g
-    b = next(u for u in bd if u != d)
+            d = next(u for u in dg if u in bd)
            g = next(u for u in dg if u != d)
-    # f is in the three 6-length digits, while c is only in 2
+            # then b
-    f = next(u for u in cf if all(u in p for p in per_length[6]))
+            b = next(u for u in bd if u != d)
-    # c is not f
+            # f is in the three 6-length digits, while c is only in 2
-    c = next(u for u in cf if u != f)
+            f = next(u for u in cf if all(u in p for p in per_length[6]))
-    # e is the last one
+            # c is not f
-    e = next(u for u in "abcdefg" if u not in {a, b, c, d, f, g})
+            c = next(u for u in cf if u != f)
-    mapping = dict(zip((a, b, c, d, e, f, g), "abcdefg"))
+            # e is the last one
            e = next(u for u in "abcdefg" if u not in {a, b, c, d, f, g})
-    value = 0
+            mapping = dict(zip((a, b, c, d, e, f, g), "abcdefg"))
    for number in parts[1].strip().split():
        digit = "".join(sorted(mapping[c] for c in number))
        value = 10 * value + digits[digit]
-    if VERBOSE:
+            value = 0
-        print(value)
+            for number in parts[1].strip().split():
                digit = "".join(sorted(mapping[c] for c in number))
                value = 10 * value + digits[digit]
-    values.append(value)
+            self.logger.info(f"value for '{line}' is {value}")
            values.append(value)
-answer_2 = sum(values)
+        yield sum(values)
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2021/day9.py
+++ b/src/holt59/aoc/2021/day9.py
@ -1,18 +1,18 @@
 import sys
 from math import prod
 from typing import Any, Iterator
-values = [[int(c) for c in row] for row in sys.stdin.read().splitlines()]
+from ..base import BaseSolver
 n_rows, n_cols = len(values), len(values[0])
-def neighbors(point: tuple[int, int]):
+def neighbors(point: tuple[int, int], n_rows: int, n_cols: int):
    i, j = point
    for di, dj in ((-1, 0), (+1, 0), (0, -1), (0, +1)):
        if 0 <= i + di < n_rows and 0 <= j + dj < n_cols:
            yield (i + di, j + dj)
-def basin(start: tuple[int, int]) -> set[tuple[int, int]]:
+def basin(values: list[list[int]], start: tuple[int, int]) -> set[tuple[int, int]]:
    n_rows, n_cols = len(values), len(values[0])
    visited: set[tuple[int, int]] = set()
    queue = [start]
@ -23,22 +23,25 @@ def basin(start: tuple[int, int]) -> set[tuple[int, int]]:
            continue
        visited.add((i, j))
-        queue.extend(neighbors((i, j)))
+        queue.extend(neighbors((i, j), n_rows, n_cols))
    return visited
-low_points = [
+class Solver(BaseSolver):
-    (i, j)
+    def solve(self, input: str) -> Iterator[Any]:
-    for i in range(n_rows)
+        values = [[int(c) for c in row] for row in input.splitlines()]
-    for j in range(n_cols)
+        n_rows, n_cols = len(values), len(values[0])
    if all(values[ti][tj] > values[i][j] for ti, tj in neighbors((i, j)))
 ]
-# part 1
+        low_points = [
-answer_1 = sum(values[i][j] + 1 for i, j in low_points)
+            (i, j)
-print(f"answer 1 is {answer_1}")
+            for i in range(n_rows)
            for j in range(n_cols)
            if all(
                values[ti][tj] > values[i][j]
                for ti, tj in neighbors((i, j), n_rows, n_cols)
            )
        ]
-# part 2
+        yield sum(values[i][j] + 1 for i, j in low_points)
-answer_2 = prod(sorted(len(basin(point)) for point in low_points)[-3:])
+        yield prod(sorted(len(basin(values, point)) for point in low_points)[-3:])
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2022/day1.py
+++ b/src/holt59/aoc/2022/day1.py
@ -1,7 +1,12 @@
-import sys
+from typing import Any, Iterator
-blocks = sys.stdin.read().split("\n\n")
+from ..base import BaseSolver
 values = sorted(sum(map(int, block.split())) for block in blocks)
-print(f"answer 1 is {values[-1]}")
+
-print(f"answer 2 is {sum(values[-3:])}")
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        blocks = input.split("\n\n")
        values = sorted(sum(map(int, block.split())) for block in blocks)
        yield values[-1]
        yield sum(values[-3:])
--- a/src/holt59/aoc/2022/day10.py
+++ b/src/holt59/aoc/2022/day10.py
@ -1,38 +1,43 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 cycle = 1
 x = 1
 values = {cycle: x}
 for line in lines:
    cycle += 1
    if line == "noop":
        pass
    else:
        r = int(line.split()[1])
        values[cycle] = x
        cycle += 1
        x += r
    values[cycle] = x
 answer_1 = sum(c * values[c] for c in range(20, max(values.keys()) + 1, 40))
 print(f"answer 1 is {answer_1}")
-for i in range(6):
+class Solver(BaseSolver):
-    for j in range(40):
+    def solve(self, input: str) -> Iterator[Any]:
-        v = values[1 + i * 40 + j]
+        lines = [line.strip() for line in input.splitlines()]
-        if j >= v - 1 and j <= v + 1:
+        cycle, x = 1, 1
-            print("#", end="")
+        values = {cycle: x}
        else:
            print(".", end="")
-    print()
+        for line in lines:
            cycle += 1
            if line == "noop":
                pass
            else:
                r = int(line.split()[1])
                values[cycle] = x
                cycle += 1
                x += r
            values[cycle] = x
        answer_1 = sum(c * values[c] for c in range(20, max(values.keys()) + 1, 40))
        yield answer_1
        yield (
            "\n"
            + "\n".join(
                "".join(
                    "#"
                    if j >= (v := values[1 + i * 40 + j]) - 1 and j <= v + 1
                    else "."
                    for j in range(40)
                )
                for i in range(6)
            )
            + "\n"
        )
--- a/src/holt59/aoc/2022/day11.py
+++ b/src/holt59/aoc/2022/day11.py
@ -1,7 +1,8 @@
 import copy
 import sys
 from functools import reduce
-from typing import Callable, Final, Mapping, Sequence
+from typing import Any, Callable, Final, Iterator, Mapping, Sequence
 from ..base import BaseSolver
 class Monkey:
@ -119,24 +120,28 @@ def monkey_business(inspects: dict[Monkey, int]) -> int:
    return sorted_levels[-2] * sorted_levels[-1]
-monkeys = [parse_monkey(block.splitlines()) for block in sys.stdin.read().split("\n\n")]
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        monkeys = [parse_monkey(block.splitlines()) for block in input.split("\n\n")]
-# case 1: we simply divide the worry by 3 after applying the monkey worry operation
+        # case 1: we simply divide the worry by 3 after applying the monkey worry operation
-answer_1 = monkey_business(
+        yield monkey_business(
-    run(copy.deepcopy(monkeys), 20, me_worry_fn=lambda w: w // 3)
+            run(copy.deepcopy(monkeys), 20, me_worry_fn=lambda w: w // 3)
-)
+        )
 print(f"answer 1 is {answer_1}")
-# case 2: to keep reasonable level values, we can use a modulo operation, we need to
+        # case 2: to keep reasonable level values, we can use a modulo operation, we need to
-# use the product of all "divisible by" test so that the test remains valid
+        # use the product of all "divisible by" test so that the test remains valid
-#
+        #
-# (a + b) % c == ((a % c) + (b % c)) % c --- this would work for a single test value
+        # (a + b) % c == ((a % c) + (b % c)) % c --- this would work for a single test value
-#
+        #
-# (a + b) % c == ((a % d) + (b % d)) % c --- if d is a multiple of c, which is why here
+        # (a + b) % c == ((a % d) + (b % d)) % c --- if d is a multiple of c, which is why here
-# we use the product of all test value
+        # we use the product of all test value
-#
+        #
-total_test_value = reduce(lambda w, m: w * m.test_value, monkeys, 1)
+        total_test_value = reduce(lambda w, m: w * m.test_value, monkeys, 1)
-answer_2 = monkey_business(
+        yield monkey_business(
-    run(copy.deepcopy(monkeys), 10_000, me_worry_fn=lambda w: w % total_test_value)
+            run(
-)
+                copy.deepcopy(monkeys),
-print(f"answer 2 is {answer_2}")
+                10_000,
                me_worry_fn=lambda w: w % total_test_value,
            )
        )
--- a/src/holt59/aoc/2022/day12.py
+++ b/src/holt59/aoc/2022/day12.py
@ -1,6 +1,7 @@
 import heapq
-import sys
+from typing import Any, Callable, Iterator, TypeVar
-from typing import Callable, Iterator, TypeVar
+
 from ..base import BaseSolver
 Node = TypeVar("Node")
@ -68,30 +69,6 @@ def make_path(parents: dict[Node, Node], start: Node, end: Node) -> list[Node] |
    return list(reversed(path))
 def print_path(path: list[tuple[int, int]], n_rows: int, n_cols: int) -> None:
    end = path[-1]
    graph = [["." for _c in range(n_cols)] for _r in range(n_rows)]
    graph[end[0]][end[1]] = "E"
    for i in range(0, len(path) - 1):
        cr, cc = path[i]
        nr, nc = path[i + 1]
        if cr == nr and nc == cc - 1:
            graph[cr][cc] = "<"
        elif cr == nr and nc == cc + 1:
            graph[cr][cc] = ">"
        elif cr == nr - 1 and nc == cc:
            graph[cr][cc] = "v"
        elif cr == nr + 1 and nc == cc:
            graph[cr][cc] = "^"
        else:
            assert False, "{} -> {} infeasible".format(path[i], path[i + 1])
    print("\n".join("".join(row) for row in graph))
 def neighbors(
    grid: list[list[int]], node: tuple[int, int], up: bool
 ) -> Iterator[tuple[int, int]]:
@ -118,46 +95,82 @@ def neighbors(
 # === main code ===
 lines = sys.stdin.read().splitlines()
-grid = [[ord(cell) - ord("a") for cell in line] for line in lines]
+class Solver(BaseSolver):
    def print_path(
        self, name: str, path: list[tuple[int, int]], n_rows: int, n_cols: int
    ) -> None:
        if not self.files:
            return
-start: tuple[int, int] | None = None
+        end = path[-1]
 end: tuple[int, int] | None = None
-# for part 2
+        graph = [["." for _c in range(n_cols)] for _r in range(n_rows)]
-start_s: list[tuple[int, int]] = []
+        graph[end[0]][end[1]] = "E"
-for i_row, row in enumerate(grid):
+        for i in range(0, len(path) - 1):
-    for i_col, col in enumerate(row):
+            cr, cc = path[i]
-        if chr(col + ord("a")) == "S":
+            nr, nc = path[i + 1]
            start = (i_row, i_col)
            start_s.append(start)
        elif chr(col + ord("a")) == "E":
            end = (i_row, i_col)
        elif col == 0:
            start_s.append((i_row, i_col))
-assert start is not None
+            if cr == nr and nc == cc - 1:
-assert end is not None
+                graph[cr][cc] = "<"
            elif cr == nr and nc == cc + 1:
                graph[cr][cc] = ">"
            elif cr == nr - 1 and nc == cc:
                graph[cr][cc] = "v"
            elif cr == nr + 1 and nc == cc:
                graph[cr][cc] = "^"
            else:
                assert False, "{} -> {} infeasible".format(path[i], path[i + 1])
-# fix values
+        self.files.create(
-grid[start[0]][start[1]] = 0
+            f"graph_{name}.txt",
-grid[end[0]][end[1]] = ord("z") - ord("a")
+            "\n".join("".join(row) for row in graph).encode(),
            text=True,
        )
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-lengths_1, parents_1 = dijkstra(
+        grid = [[ord(cell) - ord("a") for cell in line] for line in lines]
    start=start, neighbors=lambda n: neighbors(grid, n, True), cost=lambda lhs, rhs: 1
 )
 path_1 = make_path(parents_1, start, end)
 assert path_1 is not None
-print_path(path_1, n_rows=len(grid), n_cols=len(grid[0]))
+        start: tuple[int, int] | None = None
        end: tuple[int, int] | None = None
-print(f"answer 1 is {lengths_1[end] - 1}")
+        # for part 2
        start_s: list[tuple[int, int]] = []
-lengths_2, parents_2 = dijkstra(
+        for i_row, row in enumerate(grid):
-    start=end, neighbors=lambda n: neighbors(grid, n, False), cost=lambda lhs, rhs: 1
+            for i_col, col in enumerate(row):
-)
+                if chr(col + ord("a")) == "S":
-answer_2 = min(lengths_2.get(start, float("inf")) for start in start_s)
+                    start = (i_row, i_col)
-print(f"answer 2 is {answer_2}")
+                    start_s.append(start)
                elif chr(col + ord("a")) == "E":
                    end = (i_row, i_col)
                elif col == 0:
                    start_s.append((i_row, i_col))
        assert start is not None
        assert end is not None
        # fix values
        grid[start[0]][start[1]] = 0
        grid[end[0]][end[1]] = ord("z") - ord("a")
        lengths_1, parents_1 = dijkstra(
            start=start,
            neighbors=lambda n: neighbors(grid, n, True),
            cost=lambda lhs, rhs: 1,
        )
        path_1 = make_path(parents_1, start, end)
        assert path_1 is not None
        self.print_path("answer1", path_1, n_rows=len(grid), n_cols=len(grid[0]))
        yield lengths_1[end] - 1
        lengths_2, _ = dijkstra(
            start=end,
            neighbors=lambda n: neighbors(grid, n, False),
            cost=lambda lhs, rhs: 1,
        )
        yield min(lengths_2.get(start, float("inf")) for start in start_s)
--- a/src/holt59/aoc/2022/day13.py
+++ b/src/holt59/aoc/2022/day13.py
@ -1,11 +1,8 @@
 import json
 import sys
 from functools import cmp_to_key
-from typing import TypeAlias, cast
+from typing import Any, Iterator, TypeAlias, cast
-blocks = sys.stdin.read().strip().split("\n\n")
+from ..base import BaseSolver
 pairs = [tuple(json.loads(p) for p in block.split("\n")) for block in blocks]
 Packet: TypeAlias = list[int | list["Packet"]]
@ -28,14 +25,18 @@ def compare(lhs: Packet, rhs: Packet) -> int:
    return len(rhs) - len(lhs)
-answer_1 = sum(i + 1 for i, (lhs, rhs) in enumerate(pairs) if compare(lhs, rhs) > 0)
+class Solver(BaseSolver):
-print(f"answer_1 is {answer_1}")
+    def solve(self, input: str) -> Iterator[Any]:
        blocks = input.split("\n\n")
        pairs = [tuple(json.loads(p) for p in block.split("\n")) for block in blocks]
-dividers = [[[2]], [[6]]]
+        yield sum(i + 1 for i, (lhs, rhs) in enumerate(pairs) if compare(lhs, rhs) > 0)
-packets = [packet for packets in pairs for packet in packets]
+        dividers = [[[2]], [[6]]]
 packets.extend(dividers)
 packets = list(reversed(sorted(packets, key=cmp_to_key(compare))))
-d_index = [packets.index(d) + 1 for d in dividers]
+        packets = [packet for packets in pairs for packet in packets]
-print(f"answer 2 is {d_index[0] * d_index[1]}")
+        packets.extend(dividers)
        packets = list(reversed(sorted(packets, key=cmp_to_key(compare))))
        d_index = [packets.index(d) + 1 for d in dividers]
        yield d_index[0] * d_index[1]
--- a/src/holt59/aoc/2022/day14.py
+++ b/src/holt59/aoc/2022/day14.py
@ -1,6 +1,7 @@
 import sys
 from enum import Enum, auto
-from typing import Callable, cast
+from typing import Any, Callable, Iterator, cast
 from ..base import BaseSolver
 class Cell(Enum):
@ -12,26 +13,6 @@ class Cell(Enum):
        return {Cell.AIR: ".", Cell.ROCK: "#", Cell.SAND: "O"}[self]
 def print_blocks(blocks: dict[tuple[int, int], Cell]):
    """
    Print the given set of blocks on a grid.
    Args:
        blocks: Set of blocks to print.
    """
    x_min, y_min, x_max, y_max = (
        min(x for x, _ in blocks),
        0,
        max(x for x, _ in blocks),
        max(y for _, y in blocks),
    )
    for y in range(y_min, y_max + 1):
        print(
            "".join(str(blocks.get((x, y), Cell.AIR)) for x in range(x_min, x_max + 1))
        )
 def flow(
    blocks: dict[tuple[int, int], Cell],
    stop_fn: Callable[[int, int], bool],
@ -84,57 +65,82 @@ def flow(
 # === inputs ===
 lines = sys.stdin.read().splitlines()
-paths: list[list[tuple[int, int]]] = []
+class Solver(BaseSolver):
-for line in lines:
+    def print_blocks(self, name: str, blocks: dict[tuple[int, int], Cell]):
-    parts = line.split(" -> ")
+        """
-    paths.append(
+        Print the given set of blocks on a grid.
        [
            cast(tuple[int, int], tuple(int(c.strip()) for c in part.split(",")))
            for part in parts
        ]
    )
        Args:
            blocks: Set of blocks to print.
        """
        if not self.files:
            return
-blocks: dict[tuple[int, int], Cell] = {}
+        x_min, y_min, x_max, y_max = (
-for path in paths:
+            min(x for x, _ in blocks),
-    for start, end in zip(path[:-1], path[1:]):
+            0,
-        x_start = min(start[0], end[0])
+            max(x for x, _ in blocks),
-        x_end = max(start[0], end[0]) + 1
+            max(y for _, y in blocks),
-        y_start = min(start[1], end[1])
+        )
        y_end = max(start[1], end[1]) + 1
-        for x in range(x_start, x_end):
+        self.files.create(
-            for y in range(y_start, y_end):
+            f"blocks_{name}.txt",
-                blocks[x, y] = Cell.ROCK
+            "\n".join(
                "".join(
                    str(blocks.get((x, y), Cell.AIR)) for x in range(x_min, x_max + 1)
                )
                for y in range(y_min, y_max + 1)
            ).encode(),
            True,
        )
-print_blocks(blocks)
+    def solve(self, input: str) -> Iterator[Any]:
-print()
+        lines = [line.strip() for line in input.splitlines()]
-x_min, y_min, x_max, y_max = (
+        paths: list[list[tuple[int, int]]] = []
-    min(x for x, _ in blocks),
+        for line in lines:
-    0,
+            parts = line.split(" -> ")
-    max(x for x, _ in blocks),
+            paths.append(
-    max(y for _, y in blocks),
+                [
-)
+                    cast(
                        tuple[int, int], tuple(int(c.strip()) for c in part.split(","))
                    )
                    for part in parts
                ]
            )
-# === part 1 ===
+        blocks: dict[tuple[int, int], Cell] = {}
        for path in paths:
            for start, end in zip(path[:-1], path[1:]):
                x_start = min(start[0], end[0])
                x_end = max(start[0], end[0]) + 1
                y_start = min(start[1], end[1])
                y_end = max(start[1], end[1]) + 1
-blocks_1 = flow(
+                for x in range(x_start, x_end):
-    blocks.copy(), stop_fn=lambda x, y: y > y_max, fill_fn=lambda x, y: Cell.AIR
+                    for y in range(y_start, y_end):
-)
+                        blocks[x, y] = Cell.ROCK
 print_blocks(blocks_1)
 print(f"answer 1 is {sum(v == Cell.SAND for v in blocks_1.values())}")
 print()
-# === part 2 ===
+        self.print_blocks("start", blocks)
-blocks_2 = flow(
+        y_max = max(y for _, y in blocks)
-    blocks.copy(),
+
-    stop_fn=lambda x, y: x == 500 and y == 0,
+        # === part 1 ===
-    fill_fn=lambda x, y: Cell.AIR if y < y_max + 2 else Cell.ROCK,
+
-)
+        blocks_1 = flow(
-blocks_2[500, 0] = Cell.SAND
+            blocks.copy(), stop_fn=lambda x, y: y > y_max, fill_fn=lambda x, y: Cell.AIR
-print_blocks(blocks_2)
+        )
-print(f"answer 2 is {sum(v == Cell.SAND for v in blocks_2.values())}")
+        self.print_blocks("part1", blocks_1)
        yield sum(v == Cell.SAND for v in blocks_1.values())
        # === part 2 ===
        blocks_2 = flow(
            blocks.copy(),
            stop_fn=lambda x, y: x == 500 and y == 0,
            fill_fn=lambda x, y: Cell.AIR if y < y_max + 2 else Cell.ROCK,
        )
        blocks_2[500, 0] = Cell.SAND
        self.print_blocks("part2", blocks_2)
        yield sum(v == Cell.SAND for v in blocks_2.values())
--- a/src/holt59/aoc/2022/day15.py
+++ b/src/holt59/aoc/2022/day15.py
@ -1,90 +1,95 @@
-import sys
+import itertools as it
-from typing import Any
+from typing import Any, Iterator
 import numpy as np
 import parse  # type: ignore
 from numpy.typing import NDArray
-
+from ..base import BaseSolver
 def part1(sensor_to_beacon: dict[tuple[int, int], tuple[int, int]], row: int) -> int:
    no_beacons_row_l: list[NDArray[np.floating[Any]]] = []
    for (sx, sy), (bx, by) in sensor_to_beacon.items():
        d = abs(sx - bx) + abs(sy - by)  # closest
        no_beacons_row_l.append(sx - np.arange(0, d - abs(sy - row) + 1))  # type: ignore
        no_beacons_row_l.append(sx + np.arange(0, d - abs(sy - row) + 1))  # type: ignore
    beacons_at_row = set(bx for (bx, by) in sensor_to_beacon.values() if by == row)
    no_beacons_row = set(np.concatenate(no_beacons_row_l)).difference(beacons_at_row)  # type: ignore
    return len(no_beacons_row)
-def part2_intervals(
+class Solver(BaseSolver):
-    sensor_to_beacon: dict[tuple[int, int], tuple[int, int]], xy_max: int
+    def part1(
-) -> tuple[int, int, int]:
+        self, sensor_to_beacon: dict[tuple[int, int], tuple[int, int]], row: int
-    from tqdm import trange
+    ) -> int:
        no_beacons_row_l: list[NDArray[np.floating[Any]]] = []
        for (sx, sy), (bx, by) in sensor_to_beacon.items():
            d = abs(sx - bx) + abs(sy - by)  # closest
            no_beacons_row_l.append(sx - np.arange(0, d - abs(sy - row) + 1))  # type: ignore
            no_beacons_row_l.append(sx + np.arange(0, d - abs(sy - row) + 1))  # type: ignore
        beacons_at_row = set(bx for (bx, by) in sensor_to_beacon.values() if by == row)
        no_beacons_row = set(it.chain(*no_beacons_row_l)).difference(beacons_at_row)  # type: ignore
        return len(no_beacons_row)
    def part2_intervals(
        self, sensor_to_beacon: dict[tuple[int, int], tuple[int, int]], xy_max: int
    ) -> tuple[int, int, int]:
        for y in self.progress.wrap(range(xy_max + 1)):
            its: list[tuple[int, int]] = []
            for (sx, sy), (bx, by) in sensor_to_beacon.items():
                d = abs(sx - bx) + abs(sy - by)
                dx = d - abs(sy - y)
                if dx >= 0:
                    its.append((max(0, sx - dx), min(sx + dx, xy_max)))
            its = sorted(its)
            _, e = its[0]
            for si, ei in its[1:]:
                if si > e + 1:
                    return si - 1, y, 4_000_000 * (si - 1) + y
                if ei > e:
                    e = ei
        return (0, 0, 0)
    def part2_cplex(
        self, sensor_to_beacon: dict[tuple[int, int], tuple[int, int]], xy_max: int
    ) -> tuple[int, int, int]:
        from docplex.mp.model import Model
        m = Model()
        x, y = m.continuous_var_list(2, ub=xy_max, name=["x", "y"])
    for y in trange(xy_max + 1):
        its: list[tuple[int, int]] = []
        for (sx, sy), (bx, by) in sensor_to_beacon.items():
            d = abs(sx - bx) + abs(sy - by)
-            dx = d - abs(sy - y)
+            m.add_constraint(
                m.abs(x - sx) + m.abs(y - sy) >= d + 1,  # type: ignore
                ctname=f"ct_{sx}_{sy}",
            )
-            if dx >= 0:
+        m.set_objective("min", x + y)
                its.append((max(0, sx - dx), min(sx + dx, xy_max)))
-        its = sorted(its)
+        s = m.solve()
-        _, e = its[0]
+        assert s is not None
-        for si, ei in its[1:]:
+        vx = int(s.get_value(x))
-            if si > e + 1:
+        vy = int(s.get_value(y))
-                return si - 1, y, 4_000_000 * (si - 1) + y
+        return vx, vy, 4_000_000 * vx + vy
            if ei > e:
                e = ei
-    return (0, 0, 0)
+    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
        sensor_to_beacon: dict[tuple[int, int], tuple[int, int]] = {}
-def part2_cplex(
+        for line in lines:
-    sensor_to_beacon: dict[tuple[int, int], tuple[int, int]], xy_max: int
+            r: dict[str, str] = parse.parse(  # type: ignore
-) -> tuple[int, int, int]:
+                "Sensor at x={sx}, y={sy}: closest beacon is at x={bx}, y={by}", line
-    from docplex.mp.model import Model
+            )
            sensor_to_beacon[int(r["sx"]), int(r["sy"])] = (int(r["bx"]), int(r["by"]))
-    m = Model()
+        xy_max = 4_000_000 if max(sensor_to_beacon) > (1_000, 0) else 20
        row = 2_000_000 if max(sensor_to_beacon) > (1_000, 0) else 10
-    x, y = m.continuous_var_list(2, ub=xy_max, name=["x", "y"])
+        yield self.part1(sensor_to_beacon, row)
-    for (sx, sy), (bx, by) in sensor_to_beacon.items():
+        # x, y, a2 = part2_cplex(sensor_to_beacon, xy_max)
-        d = abs(sx - bx) + abs(sy - by)
+        x, y, a2 = self.part2_intervals(sensor_to_beacon, xy_max)
-        m.add_constraint(m.abs(x - sx) + m.abs(y - sy) >= d + 1, ctname=f"ct_{sx}_{sy}")  # type: ignore
+        self.logger.info(f"answer 2 is {a2} (x={x}, y={y})")
-
+        yield a2
    m.set_objective("min", x + y)
    s = m.solve()
    assert s is not None
    vx = int(s.get_value(x))
    vy = int(s.get_value(y))
    return vx, vy, 4_000_000 * vx + vy
 lines = sys.stdin.read().splitlines()
 sensor_to_beacon: dict[tuple[int, int], tuple[int, int]] = {}
 for line in lines:
    r: dict[str, str] = parse.parse(  # type: ignore
        "Sensor at x={sx}, y={sy}: closest beacon is at x={bx}, y={by}", line
    )
    sensor_to_beacon[int(r["sx"]), int(r["sy"])] = (int(r["bx"]), int(r["by"]))
 xy_max = 4_000_000 if max(sensor_to_beacon) > (1_000, 0) else 20
 row = 2_000_000 if max(sensor_to_beacon) > (1_000, 0) else 10
 print(f"answer 1 is {part1(sensor_to_beacon, row)}")
 # x, y, a2 = part2_cplex(sensor_to_beacon, xy_max)
 x, y, a2 = part2_intervals(sensor_to_beacon, xy_max)
 print(f"answer 2 is {a2} (x={x}, y={y})")
--- a/src/holt59/aoc/2022/day16.py
+++ b/src/holt59/aoc/2022/day16.py
@ -3,11 +3,10 @@ from __future__ import annotations
 import heapq
 import itertools
 import re
 import sys
 from collections import defaultdict
-from typing import FrozenSet, NamedTuple
+from typing import Any, FrozenSet, Iterator, NamedTuple
-from tqdm import tqdm
+from ..base import BaseSolver
 class Pipe(NamedTuple):
@ -36,8 +35,8 @@ def breadth_first_search(pipes: dict[str, Pipe], pipe: Pipe) -> dict[Pipe, int]:
    Runs a BFS from the given pipe and return the shortest distance (in term of hops)
    to all other pipes.
    """
-    queue = [(0, pipe_1)]
+    queue = [(0, pipe)]
-    visited = set()
+    visited: set[Pipe] = set()
    distances: dict[Pipe, int] = {}
    while len(distances) < len(pipes):
@ -61,98 +60,100 @@ def update_with_better(
    node_at_times[flowing] = max(node_at_times[flowing], flow)
 def part_1(
    start_pipe: Pipe,
    max_time: int,
    distances: dict[tuple[Pipe, Pipe], int],
    relevant_pipes: FrozenSet[Pipe],
 ):
    node_at_times: dict[int, dict[Pipe, dict[FrozenSet[Pipe], int]]] = defaultdict(
        lambda: defaultdict(lambda: defaultdict(lambda: 0))
    )
    node_at_times[0] = {start_pipe: {frozenset(): 0}}
    for time in range(max_time):
        for c_pipe, nodes in node_at_times[time].items():
            for flowing, flow in nodes.items():
                for target in relevant_pipes:
                    distance = distances[c_pipe, target] + 1
                    if time + distance >= max_time or target in flowing:
                        continue
                    update_with_better(
                        node_at_times[time + distance][target],
                        flow + sum(pipe.flow for pipe in flowing) * distance,
                        flowing | {target},
                    )
                update_with_better(
                    node_at_times[max_time][c_pipe],
                    flow + sum(pipe.flow for pipe in flowing) * (max_time - time),
                    flowing,
                )
    return max(
        flow
        for nodes_of_pipe in node_at_times[max_time].values()
        for flow in nodes_of_pipe.values()
    )
 def part_2(
    start_pipe: Pipe,
    max_time: int,
    distances: dict[tuple[Pipe, Pipe], int],
    relevant_pipes: FrozenSet[Pipe],
 ):
    def compute(pipes_for_me: FrozenSet[Pipe]) -> int:
        return part_1(start_pipe, max_time, distances, pipes_for_me) + part_1(
            start_pipe, max_time, distances, relevant_pipes - pipes_for_me
        )
    combs = [
        frozenset(relevant_pipes_1)
        for r in range(2, len(relevant_pipes) // 2 + 1)
        for relevant_pipes_1 in itertools.combinations(relevant_pipes, r)
    ]
    return max(compute(comb) for comb in tqdm(combs))
 # === MAIN ===
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def part_1(
        self,
        start_pipe: Pipe,
        max_time: int,
        distances: dict[tuple[Pipe, Pipe], int],
        relevant_pipes: FrozenSet[Pipe],
    ):
        node_at_times: dict[int, dict[Pipe, dict[FrozenSet[Pipe], int]]] = defaultdict(
            lambda: defaultdict(lambda: defaultdict(lambda: 0))
        )
        node_at_times[0] = {start_pipe: {frozenset(): 0}}
        for time in range(max_time):
            for c_pipe, nodes in node_at_times[time].items():
                for flowing, flow in nodes.items():
                    for target in relevant_pipes:
                        distance = distances[c_pipe, target] + 1
                        if time + distance >= max_time or target in flowing:
                            continue
-pipes: dict[str, Pipe] = {}
+                        update_with_better(
-for line in lines:
+                            node_at_times[time + distance][target],
-    r = re.match(
+                            flow + sum(pipe.flow for pipe in flowing) * distance,
-        R"Valve ([A-Z]+) has flow rate=([0-9]+); tunnels? leads? to valves? (.+)",
+                            flowing | {target},
-        line,
+                        )
    )
    assert r
-    g = r.groups()
+                    update_with_better(
                        node_at_times[max_time][c_pipe],
                        flow + sum(pipe.flow for pipe in flowing) * (max_time - time),
                        flowing,
                    )
-    pipes[g[0]] = Pipe(g[0], int(g[1]), g[2].split(", "))
+        return max(
            flow
            for nodes_of_pipe in node_at_times[max_time].values()
            for flow in nodes_of_pipe.values()
        )
-# compute distances from one valve to any other
+    def part_2(
-distances: dict[tuple[Pipe, Pipe], int] = {}
+        self,
-for pipe_1 in pipes.values():
+        start_pipe: Pipe,
-    distances.update(
+        max_time: int,
-        {
+        distances: dict[tuple[Pipe, Pipe], int],
-            (pipe_1, pipe_2): distance
+        relevant_pipes: FrozenSet[Pipe],
-            for pipe_2, distance in breadth_first_search(pipes, pipe_1).items()
+    ):
-        }
+        def compute(pipes_for_me: FrozenSet[Pipe]) -> int:
-    )
+            return self.part_1(
                start_pipe, max_time, distances, pipes_for_me
            ) + self.part_1(
                start_pipe, max_time, distances, relevant_pipes - pipes_for_me
            )
-# valves with flow
+        combs = [
-relevant_pipes = frozenset(pipe for pipe in pipes.values() if pipe.flow > 0)
+            frozenset(relevant_pipes_1)
            for r in range(2, len(relevant_pipes) // 2 + 1)
            for relevant_pipes_1 in itertools.combinations(relevant_pipes, r)
        ]
        return max(compute(comb) for comb in self.progress.wrap(combs))
-# 1651, 1653
+    def solve(self, input: str) -> Iterator[Any]:
-print(part_1(pipes["AA"], 30, distances, relevant_pipes))
+        lines = [line.strip() for line in input.splitlines()]
-# 1707, 2223
+        pipes: dict[str, Pipe] = {}
-print(part_2(pipes["AA"], 26, distances, relevant_pipes))
+        for line in lines:
            r = re.match(
                R"Valve ([A-Z]+) has flow rate=([0-9]+); tunnels? leads? to valves? (.+)",
                line,
            )
            assert r
            g = r.groups()
            pipes[g[0]] = Pipe(g[0], int(g[1]), g[2].split(", "))
        # compute distances from one valve to any other
        distances: dict[tuple[Pipe, Pipe], int] = {}
        for pipe_1 in pipes.values():
            distances.update(
                {
                    (pipe_1, pipe_2): distance
                    for pipe_2, distance in breadth_first_search(pipes, pipe_1).items()
                }
            )
        # valves with flow
        relevant_pipes = frozenset(pipe for pipe in pipes.values() if pipe.flow > 0)
        # 1651, 1653
        yield self.part_1(pipes["AA"], 30, distances, relevant_pipes)
        # 1707, 2223
        yield self.part_2(pipes["AA"], 26, distances, relevant_pipes)
--- a/src/holt59/aoc/2022/day17.py
+++ b/src/holt59/aoc/2022/day17.py
@ -1,23 +1,16 @@
-import sys
+from typing import Any, Iterator, Sequence, TypeAlias, TypeVar
 from typing import Sequence, TypeVar
 import numpy as np
 from numpy.typing import NDArray
 from ..base import BaseSolver
 T = TypeVar("T")
-
+Tower: TypeAlias = NDArray[np.bool]
 def print_tower(tower: np.ndarray, out: str = "#"):
    print("-" * (tower.shape[1] + 2))
    non_empty = False
    for row in reversed(range(1, tower.shape[0])):
        if not non_empty and not tower[row, :].any():
            continue
        non_empty = True
        print("|" + "".join(out if c else "." for c in tower[row, :]) + "|")
    print("+" + "-" * tower.shape[1] + "+")
-def tower_height(tower: np.ndarray) -> int:
+def tower_height(tower: Tower) -> int:
    return int(tower.shape[0] - tower[::-1, :].argmax(axis=0).min() - 1)
@ -45,8 +38,8 @@ def build_tower(
    n_rocks: int,
    jets: str,
    early_stop: bool = False,
-    init: np.ndarray = np.ones(WIDTH, dtype=bool),
+    init: Tower = np.ones(WIDTH, dtype=bool),
-) -> tuple[np.ndarray, int, int, dict[int, int]]:
+) -> tuple[Tower, int, int, dict[int, int]]:
    tower = EMPTY_BLOCKS.copy()
    tower[0, :] = init
@ -95,26 +88,24 @@ def build_tower(
    return tower, rock_count, done_at.get((i_rock, i_jet), -1), heights
-line = sys.stdin.read().strip()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        tower, *_ = build_tower(2022, input)
        yield tower_height(tower)
-tower, *_ = build_tower(2022, line)
+        TOTAL_ROCKS = 1_000_000_000_000
-answer_1 = tower_height(tower)
+        _tower_1, n_rocks_1, prev_1, heights_1 = build_tower(TOTAL_ROCKS, input, True)
-print(f"answer 1 is {answer_1}")
+        assert prev_1 > 0
-TOTAL_ROCKS = 1_000_000_000_000
+        # 2767 1513
-tower_1, n_rocks_1, prev_1, heights_1 = build_tower(TOTAL_ROCKS, line, True)
+        remaining_rocks = TOTAL_ROCKS - n_rocks_1
-assert prev_1 > 0
+        n_repeat_rocks = n_rocks_1 - prev_1
        n_repeat_towers = remaining_rocks // n_repeat_rocks
-# 2767 1513
+        base_height = heights_1[prev_1]
-remaining_rocks = TOTAL_ROCKS - n_rocks_1
+        repeat_height = heights_1[prev_1 + n_repeat_rocks - 1] - heights_1[prev_1]
-n_repeat_rocks = n_rocks_1 - prev_1
+        remaining_height = (
-n_repeat_towers = remaining_rocks // n_repeat_rocks
+            heights_1[prev_1 + remaining_rocks % n_repeat_rocks] - heights_1[prev_1]
        )
-base_height = heights_1[prev_1]
+        yield base_height + (n_repeat_towers + 1) * repeat_height + remaining_height
 repeat_height = heights_1[prev_1 + n_repeat_rocks - 1] - heights_1[prev_1]
 remaining_height = (
    heights_1[prev_1 + remaining_rocks % n_repeat_rocks] - heights_1[prev_1]
 )
 answer_2 = base_height + (n_repeat_towers + 1) * repeat_height + remaining_height
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2022/day18.py
+++ b/src/holt59/aoc/2022/day18.py
@ -1,50 +1,58 @@
-import sys
+from typing import Any, Iterator
 import numpy as np
-xyz = np.asarray(
+from ..base import BaseSolver
    [
        tuple(int(x) for x in row.split(","))  # type: ignore
        for row in sys.stdin.read().splitlines()
    ]
 )
 xyz = xyz - xyz.min(axis=0) + 1
-cubes = np.zeros(xyz.max(axis=0) + 3, dtype=bool)
+class Solver(BaseSolver):
-cubes[xyz[:, 0], xyz[:, 1], xyz[:, 2]] = True
+    def solve(self, input: str) -> Iterator[Any]:
        xyz = np.asarray(
            [
                tuple(int(x) for x in row.split(","))  # type: ignore
                for row in input.splitlines()
            ]
        )
-n_dims = len(cubes.shape)
+        xyz = xyz - xyz.min(axis=0) + 1
-faces = [(-1, 0, 0), (1, 0, 0), (0, -1, 0), (0, 1, 0), (0, 0, -1), (0, 0, 1)]
+        cubes = np.zeros(xyz.max(axis=0) + 3, dtype=bool)
        cubes[xyz[:, 0], xyz[:, 1], xyz[:, 2]] = True
-answer_1 = sum(
+        faces = [(-1, 0, 0), (1, 0, 0), (0, -1, 0), (0, 1, 0), (0, 0, -1), (0, 0, 1)]
    1 for x, y, z in xyz for dx, dy, dz in faces if not cubes[x + dx, y + dy, z + dz]
 )
 print(f"answer 1 is {answer_1}")
-visited = np.zeros_like(cubes, dtype=bool)
+        yield sum(
-queue = [(0, 0, 0)]
+            1
            for x, y, z in xyz
            for dx, dy, dz in faces
            if not cubes[x + dx, y + dy, z + dz]
        )
-n_faces = 0
+        visited = np.zeros_like(cubes, dtype=bool)
-while queue:
+        queue = [(0, 0, 0)]
    x, y, z = queue.pop(0)
-    if visited[x, y, z]:
+        n_faces = 0
-        continue
+        while queue:
            x, y, z = queue.pop(0)
-    visited[x, y, z] = True
+            if visited[x, y, z]:
                continue
-    for dx, dy, dz in faces:
+            visited[x, y, z] = True
        nx, ny, nz = x + dx, y + dy, z + dz
        if not all(n >= 0 and n < cubes.shape[i] for i, n in enumerate((nx, ny, nz))):
            continue
-        if visited[nx, ny, nz]:
+            for dx, dy, dz in faces:
-            continue
+                nx, ny, nz = x + dx, y + dy, z + dz
                if not all(
                    n >= 0 and n < cubes.shape[i] for i, n in enumerate((nx, ny, nz))
                ):
                    continue
-        if cubes[nx, ny, nz]:
+                if visited[nx, ny, nz]:
-            n_faces += 1
+                    continue
-        else:
+
-            queue.append((nx, ny, nz))
+                if cubes[nx, ny, nz]:
-print(f"answer 2 is {n_faces}")
+                    n_faces += 1
                else:
                    queue.append((nx, ny, nz))
        yield n_faces
--- a/src/holt59/aoc/2022/day19.py
+++ b/src/holt59/aoc/2022/day19.py
@ -1,10 +1,11 @@
-import sys
+from typing import Any, Iterator, Literal
 from typing import Any, Literal
 import numpy as np
 import parse  # pyright: ignore[reportMissingTypeStubs]
 from numpy.typing import NDArray
 from ..base import BaseSolver
 Reagent = Literal["ore", "clay", "obsidian", "geode"]
 REAGENTS: tuple[Reagent, ...] = (
    "ore",
@ -62,29 +63,6 @@ def dominates(lhs: State, rhs: State):
    )
 lines = sys.stdin.read().splitlines()
 blueprints: list[dict[Reagent, IntOfReagent]] = []
 for line in lines:
    r: list[int] = parse.parse(  # type: ignore
        "Blueprint {}: "
        "Each ore robot costs {:d} ore. "
        "Each clay robot costs {:d} ore. "
        "Each obsidian robot costs {:d} ore and {:d} clay. "
        "Each geode robot costs {:d} ore and {:d} obsidian.",
        line,
    )
    blueprints.append(
        {
            "ore": {"ore": r[1]},
            "clay": {"ore": r[2]},
            "obsidian": {"ore": r[3], "clay": r[4]},
            "geode": {"ore": r[5], "obsidian": r[6]},
        }
    )
 def run(blueprint: dict[Reagent, dict[Reagent, int]], max_time: int) -> int:
    # since we can only build one robot per time, we do not need more than X robots
    # of type K where X is the maximum number of K required among all robots, e.g.,
@ -173,11 +151,31 @@ def run(blueprint: dict[Reagent, dict[Reagent, int]], max_time: int) -> int:
    return max(state.reagents["geode"] for state in state_after_t[max_time])
-answer_1 = sum(
+class Solver(BaseSolver):
-    (i_blueprint + 1) * run(blueprint, 24)
+    def solve(self, input: str) -> Iterator[Any]:
-    for i_blueprint, blueprint in enumerate(blueprints)
+        blueprints: list[dict[Reagent, IntOfReagent]] = []
-)
+        for line in input.splitlines():
-print(f"answer 1 is {answer_1}")
+            r: list[int] = parse.parse(  # type: ignore
                "Blueprint {}: "
                "Each ore robot costs {:d} ore. "
                "Each clay robot costs {:d} ore. "
                "Each obsidian robot costs {:d} ore and {:d} clay. "
                "Each geode robot costs {:d} ore and {:d} obsidian.",
                line,
            )
-answer_2 = run(blueprints[0], 32) * run(blueprints[1], 32) * run(blueprints[2], 32)
+            blueprints.append(
-print(f"answer 2 is {answer_2}")
+                {
                    "ore": {"ore": r[1]},
                    "clay": {"ore": r[2]},
                    "obsidian": {"ore": r[3], "clay": r[4]},
                    "geode": {"ore": r[5], "obsidian": r[6]},
                }
            )
        yield sum(
            (i_blueprint + 1) * run(blueprint, 24)
            for i_blueprint, blueprint in enumerate(blueprints)
        )
        yield (run(blueprints[0], 32) * run(blueprints[1], 32) * run(blueprints[2], 32))
--- a/src/holt59/aoc/2022/day2.py
+++ b/src/holt59/aoc/2022/day2.py
@ -1,4 +1,6 @@
-import sys
+from typing import Any, Iterator
 from ..base import BaseSolver
 def score_1(ux: int, vx: int) -> int:
@ -33,21 +35,23 @@ def score_2(ux: int, vx: int) -> int:
    return (ux + vx - 1) % 3 + 1 + vx * 3
-lines = sys.stdin.readlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-# the solution relies on replacing rock / paper / scissor by values 0 / 1 / 2 and using
+        # the solution relies on replacing rock / paper / scissor by values 0 / 1 / 2 and using
-# modulo-3 arithmetic
+        # modulo-3 arithmetic
-#
+        #
-# in modulo-3 arithmetic, the winning move is 1 + the opponent move (e.g., winning move
+        # in modulo-3 arithmetic, the winning move is 1 + the opponent move (e.g., winning move
-# if opponent plays 0 is 1, or 0 if opponent plays 2 (0 = (2 + 1 % 3)))
+        # if opponent plays 0 is 1, or 0 if opponent plays 2 (0 = (2 + 1 % 3)))
-#
+        #
-# we read the lines in a Nx2 in array with value 0/1/2 instead of A/B/C or X/Y/Z for
+        # we read the lines in a Nx2 in array with value 0/1/2 instead of A/B/C or X/Y/Z for
-# easier manipulation
+        # easier manipulation
-values = [(ord(row[0]) - ord("A"), ord(row[2]) - ord("X")) for row in lines]
+        values = [(ord(row[0]) - ord("A"), ord(row[2]) - ord("X")) for row in lines]
-# part 1 - 13526
+        # part 1 - 13526
-print(f"answer 1 is {sum(score_1(*v) for v in values)}")
+        yield sum(score_1(*v) for v in values)
-# part 2 - 14204
+        # part 2 - 14204
-print(f"answer 2 is {sum(score_2(*v) for v in values)}")
+        yield sum(score_2(*v) for v in values)
--- a/src/holt59/aoc/2022/day20.py
+++ b/src/holt59/aoc/2022/day20.py
@ -1,6 +1,8 @@
 from __future__ import annotations
-import sys
+from typing import Any, Iterator
 from ..base import BaseSolver
 class Number:
@ -65,10 +67,9 @@ def decrypt(numbers: list[Number], key: int, rounds: int) -> int:
    )
-numbers = [Number(int(x)) for i, x in enumerate(sys.stdin.readlines())]
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        numbers = [Number(int(x)) for x in input.splitlines()]
-answer_1 = decrypt(numbers, 1, 1)
+        yield decrypt(numbers, 1, 1)
-print(f"answer 1 is {answer_1}")
+        yield decrypt(numbers, 811589153, 10)
 answer_2 = decrypt(numbers, 811589153, 10)
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2022/day21.py
+++ b/src/holt59/aoc/2022/day21.py
@ -1,6 +1,7 @@
 import operator
-import sys
+from typing import Any, Callable, Iterator
-from typing import Callable
+
 from ..base import BaseSolver
 def compute(monkeys: dict[str, int | tuple[str, str, str]], monkey: str) -> int:
@ -77,31 +78,31 @@ def invert(
    return monkeys
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = [line.strip() for line in input.splitlines()]
-monkeys: dict[str, int | tuple[str, str, str]] = {}
+        monkeys: dict[str, int | tuple[str, str, str]] = {}
-op_monkeys: set[str] = set()
+        op_monkeys: set[str] = set()
-for line in lines:
+        for line in lines:
-    parts = line.split(":")
+            parts = line.split(":")
-    name = parts[0].strip()
+            name = parts[0].strip()
-    try:
+            try:
-        value = int(parts[1].strip())
+                value = int(parts[1].strip())
-        monkeys[name] = value
+                monkeys[name] = value
-    except ValueError:
+            except ValueError:
-        op1, ope, op2 = parts[1].strip().split()
+                op1, ope, op2 = parts[1].strip().split()
-        monkeys[name] = (op1, ope, op2)
+                monkeys[name] = (op1, ope, op2)
-        op_monkeys.add(name)
+                op_monkeys.add(name)
        yield compute(monkeys.copy(), "root")
-answer_1 = compute(monkeys.copy(), "root")
+        # assume the second operand of 'root' can be computed, and the first one depends on
-print(f"answer 1 is {answer_1}")
+        # humn, which is the case is my input and the test input
-
+        assert isinstance(monkeys["root"], tuple)
-# assume the second operand of 'root' can be computed, and the first one depends on
+        p1, _, p2 = monkeys["root"]  # type: ignore
-# humn, which is the case is my input and the test input
+        yield compute(invert(monkeys, "humn", compute(monkeys.copy(), p2)), "humn")
 p1, _, p2 = monkeys["root"]  # type: ignore
 answer_2 = compute(invert(monkeys, "humn", compute(monkeys.copy(), p2)), "humn")
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2022/day22.py
+++ b/src/holt59/aoc/2022/day22.py
@ -1,223 +1,243 @@
 import re
-import sys
+from typing import Any, Callable, Iterator
 from typing import Callable
 import numpy as np
 from ..base import BaseSolver
 VOID, EMPTY, WALL = 0, 1, 2
 TILE_FROM_CHAR = {" ": VOID, ".": EMPTY, "#": WALL}
 SCORES = {"E": 0, "S": 1, "W": 2, "N": 3}
-board_map_s, direction_s = sys.stdin.read().split("\n\n")
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        board_map_s, direction_s = input.split("\n\n")
-# board
+        # board
-board_lines = board_map_s.splitlines()
+        board_lines = board_map_s.splitlines()
-max_line = max(len(line) for line in board_lines)
+        max_line = max(len(line) for line in board_lines)
-board = np.array(
+        board = np.array(
-    [
+            [
-        [TILE_FROM_CHAR[c] for c in row] + [VOID] * (max_line - len(row))
+                [TILE_FROM_CHAR[c] for c in row] + [VOID] * (max_line - len(row))
-        for row in board_map_s.splitlines()
+                for row in board_map_s.splitlines()
-    ]
+            ]
-)
+        )
-directions = [
+        directions = [
-    int(p1) if p2 else p1 for p1, p2 in re.findall(R"(([0-9])+|L|R)", direction_s)
+            int(p1) if p2 else p1
-]
+            for p1, p2 in re.findall(R"(([0-9])+|L|R)", direction_s)
        ]
        # find on each row and column the first and last non-void
        row_first_non_void = np.argmax(board != VOID, axis=1)
        row_last_non_void = (
            board.shape[1] - np.argmax(board[:, ::-1] != VOID, axis=1) - 1
        )
        col_first_non_void = np.argmax(board != VOID, axis=0)
        col_last_non_void = (
            board.shape[0] - np.argmax(board[::-1, :] != VOID, axis=0) - 1
        )
-# find on each row and column the first and last non-void
+        faces = np.zeros_like(board)
-row_first_non_void = np.argmax(board != VOID, axis=1)
+        size = np.gcd(board.shape[0], board.shape[1])
-row_last_non_void = board.shape[1] - np.argmax(board[:, ::-1] != VOID, axis=1) - 1
+        for row in range(0, board.shape[0], size):
-col_first_non_void = np.argmax(board != VOID, axis=0)
+            for col in range(row_first_non_void[row], row_last_non_void[row], size):
-col_last_non_void = board.shape[0] - np.argmax(board[::-1, :] != VOID, axis=0) - 1
+                faces[row : row + size, col : col + size] = faces.max() + 1
        SIZE = np.gcd(*board.shape)
-faces = np.zeros_like(board)
+        # TODO: deduce this from the actual cube...
-size = np.gcd(board.shape[0], board.shape[1])
+        faces_wrap: dict[int, dict[str, Callable[[int, int], tuple[int, int, str]]]]
 for row in range(0, board.shape[0], size):
    for col in range(row_first_non_void[row], row_last_non_void[row], size):
        faces[row : row + size, col : col + size] = faces.max() + 1
-SIZE = np.gcd(*board.shape)
+        if board.shape == (12, 16):  # example
            faces_wrap = {
                1: {
                    "W": lambda y, x: (4, 4 + y, "S"),  # 3N
                    "N": lambda y, x: (4, 11 - x, "S"),  # 2N
                    "E": lambda y, x: (11 - y, 15, "W"),  # 6E
                },
                2: {
                    "W": lambda y, x: (11, 19 - y, "N"),  # 6S
                    "N": lambda y, x: (0, 11 - y, "S"),  # 1N
                    "S": lambda y, x: (11, 11 - x, "N"),  # 5S
                },
                3: {
                    "N": lambda y, x: (x - 4, 8, "E"),  # 1W
                    "S": lambda y, x: (15 - x, 8, "E"),  # 5W
                },
                4: {"E": lambda y, x: (8, 19 - y, "S")},  # 6N
                5: {
                    "W": lambda y, x: (7, 15 - y, "N"),  # 3S
                    "S": lambda y, x: (7, 11 - x, "N"),  # 2S
                },
                6: {
                    "N": lambda y, x: (19 - x, 11, "W"),  # 4E
                    "E": lambda y, x: (11 - y, 11, "W"),  # 1E
                    "S": lambda y, x: (19 - x, 0, "E"),  # 2W
                },
            }
 # TODO: deduce this from the actual cube...
 faces_wrap: dict[int, dict[str, Callable[[int, int], tuple[int, int, str]]]]
 if board.shape == (12, 16):  # example
    faces_wrap = {
        1: {
            "W": lambda y, x: (4, 4 + y, "S"),  # 3N
            "N": lambda y, x: (4, 11 - x, "S"),  # 2N
            "E": lambda y, x: (11 - y, 15, "W"),  # 6E
        },
        2: {
            "W": lambda y, x: (11, 19 - y, "N"),  # 6S
            "N": lambda y, x: (0, 11 - y, "S"),  # 1N
            "S": lambda y, x: (11, 11 - x, "N"),  # 5S
        },
        3: {
            "N": lambda y, x: (x - 4, 8, "E"),  # 1W
            "S": lambda y, x: (15 - x, 8, "E"),  # 5W
        },
        4: {"E": lambda y, x: (8, 19 - y, "S")},  # 6N
        5: {
            "W": lambda y, x: (7, 15 - y, "N"),  # 3S
            "S": lambda y, x: (7, 11 - x, "N"),  # 2S
        },
        6: {
            "N": lambda y, x: (19 - x, 11, "W"),  # 4E
            "E": lambda y, x: (11 - y, 11, "W"),  # 1E
            "S": lambda y, x: (19 - x, 0, "E"),  # 2W
        },
    }
 else:
    faces_wrap = {
        1: {
            "W": lambda y, x: (3 * SIZE - y - 1, 0, "E"),  # 4W
            "N": lambda y, x: (2 * SIZE + x, 0, "E"),  # 6W
        },
        2: {
            "N": lambda y, x: (4 * SIZE - 1, x - 2 * SIZE, "N"),  # 6S
            "E": lambda y, x: (3 * SIZE - y - 1, 2 * SIZE - 1, "W"),  # 5E
            "S": lambda y, x: (x - SIZE, 2 * SIZE - 1, "W"),  # 3E
        },
        3: {
            "W": lambda y, x: (2 * SIZE, y - SIZE, "S"),  # 4N
            "E": lambda y, x: (SIZE - 1, SIZE + y, "N"),  # 2S
        },
        4: {
            "W": lambda y, x: (3 * SIZE - y - 1, SIZE, "E"),  # 1W
            "N": lambda y, x: (SIZE + x, SIZE, "E"),  # 3W
        },
        5: {
            "E": lambda y, x: (3 * SIZE - y - 1, 3 * SIZE - 1, "W"),  # 2E
            "S": lambda y, x: (2 * SIZE + x, SIZE - 1, "W"),  # 6E
        },
        6: {
            "W": lambda y, x: (0, y - 2 * SIZE, "S"),  # 1N
            "E": lambda y, x: (3 * SIZE - 1, y - 2 * SIZE, "N"),  # 5S
            "S": lambda y, x: (0, x + 2 * SIZE, "S"),  # 2N
        },
    }
 def wrap_part_1(y0: int, x0: int, r0: str) -> tuple[int, int, str]:
    if r0 == "E":
        return y0, row_first_non_void[y0], r0
    elif r0 == "S":
        return col_first_non_void[x0], x0, r0
    elif r0 == "W":
        return y0, row_last_non_void[y0], r0
    elif r0 == "N":
        return col_last_non_void[x0], x0, r0
    assert False
 def wrap_part_2(y0: int, x0: int, r0: str) -> tuple[int, int, str]:
    cube = faces[y0, x0]
    assert r0 in faces_wrap[cube]
    return faces_wrap[cube][r0](y0, x0)
 def run(wrap: Callable[[int, int, str], tuple[int, int, str]]) -> tuple[int, int, str]:
    y0 = 0
    x0 = np.where(board[0] == EMPTY)[0][0]
    r0 = "E"
    for direction in directions:
        if isinstance(direction, int):
            while direction > 0:
                if r0 == "E":
                    xi = np.where(board[y0, x0 + 1 : x0 + direction + 1] == WALL)[0]
                    if len(xi):
                        x0 = x0 + xi[0]
                        direction = 0
                    elif (
                        x0 + direction < board.shape[1]
                        and board[y0, x0 + direction] == EMPTY
                    ):
                        x0 = x0 + direction
                        direction = 0
                    else:
                        y0_t, x0_t, r0_t = wrap(y0, x0, r0)
                        if board[y0_t, x0_t] == WALL:
                            x0 = row_last_non_void[y0]
                            direction = 0
                        else:
                            direction = direction - (row_last_non_void[y0] - x0) - 1
                            y0, x0, r0 = y0_t, x0_t, r0_t
                elif r0 == "S":
                    yi = np.where(board[y0 + 1 : y0 + direction + 1, x0] == WALL)[0]
                    if len(yi):
                        y0 = y0 + yi[0]
                        direction = 0
                    elif (
                        y0 + direction < board.shape[0]
                        and board[y0 + direction, x0] == EMPTY
                    ):
                        y0 = y0 + direction
                        direction = 0
                    else:
                        y0_t, x0_t, r0_t = wrap(y0, x0, r0)
                        if board[y0_t, x0_t] == WALL:
                            y0 = col_last_non_void[x0]
                            direction = 0
                        else:
                            direction = direction - (col_last_non_void[x0] - y0) - 1
                            y0, x0, r0 = y0_t, x0_t, r0_t
                elif r0 == "W":
                    left = max(x0 - direction - 1, 0)
                    xi = np.where(board[y0, left:x0] == WALL)[0]
                    if len(xi):
                        x0 = left + xi[-1] + 1
                        direction = 0
                    elif x0 - direction >= 0 and board[y0, x0 - direction] == EMPTY:
                        x0 = x0 - direction
                        direction = 0
                    else:
                        y0_t, x0_t, r0_t = wrap(y0, x0, r0)
                        if board[y0_t, x0_t] == WALL:
                            x0 = row_first_non_void[y0]
                            direction = 0
                        else:
                            direction = direction - (x0 - row_first_non_void[y0]) - 1
                            y0, x0, r0 = y0_t, x0_t, r0_t
                elif r0 == "N":
                    top = max(y0 - direction - 1, 0)
                    yi = np.where(board[top:y0, x0] == WALL)[0]
                    if len(yi):
                        y0 = top + yi[-1] + 1
                        direction = 0
                    elif y0 - direction >= 0 and board[y0 - direction, x0] == EMPTY:
                        y0 = y0 - direction
                        direction = 0
                    else:
                        y0_t, x0_t, r0_t = wrap(y0, x0, r0)
                        if board[y0_t, x0_t] == WALL:
                            y0 = col_first_non_void[x0]
                            direction = 0
                        else:
                            direction = direction - (y0 - col_first_non_void[x0]) - 1
                            y0, x0, r0 = y0_t, x0_t, r0_t
        else:
-            r0 = {
+            faces_wrap = {
-                "E": {"L": "N", "R": "S"},
+                1: {
-                "N": {"L": "W", "R": "E"},
+                    "W": lambda y, x: (3 * SIZE - y - 1, 0, "E"),  # 4W
-                "W": {"L": "S", "R": "N"},
+                    "N": lambda y, x: (2 * SIZE + x, 0, "E"),  # 6W
-                "S": {"L": "E", "R": "W"},
+                },
-            }[r0][direction]
+                2: {
                    "N": lambda y, x: (4 * SIZE - 1, x - 2 * SIZE, "N"),  # 6S
                    "E": lambda y, x: (3 * SIZE - y - 1, 2 * SIZE - 1, "W"),  # 5E
                    "S": lambda y, x: (x - SIZE, 2 * SIZE - 1, "W"),  # 3E
                },
                3: {
                    "W": lambda y, x: (2 * SIZE, y - SIZE, "S"),  # 4N
                    "E": lambda y, x: (SIZE - 1, SIZE + y, "N"),  # 2S
                },
                4: {
                    "W": lambda y, x: (3 * SIZE - y - 1, SIZE, "E"),  # 1W
                    "N": lambda y, x: (SIZE + x, SIZE, "E"),  # 3W
                },
                5: {
                    "E": lambda y, x: (3 * SIZE - y - 1, 3 * SIZE - 1, "W"),  # 2E
                    "S": lambda y, x: (2 * SIZE + x, SIZE - 1, "W"),  # 6E
                },
                6: {
                    "W": lambda y, x: (0, y - 2 * SIZE, "S"),  # 1N
                    "E": lambda y, x: (3 * SIZE - 1, y - 2 * SIZE, "N"),  # 5S
                    "S": lambda y, x: (0, x + 2 * SIZE, "S"),  # 2N
                },
            }
-    return y0, x0, r0
+        def wrap_part_1(y0: int, x0: int, r0: str) -> tuple[int, int, str]:
            if r0 == "E":
                return y0, row_first_non_void[y0], r0
            elif r0 == "S":
                return col_first_non_void[x0], x0, r0
            elif r0 == "W":
                return y0, row_last_non_void[y0], r0
            elif r0 == "N":
                return col_last_non_void[x0], x0, r0
            assert False
-y1, x1, r1 = run(wrap_part_1)
+        def wrap_part_2(y0: int, x0: int, r0: str) -> tuple[int, int, str]:
-answer_1 = 1000 * (1 + y1) + 4 * (1 + x1) + SCORES[r1]
+            cube = faces[y0, x0]
-print(f"answer 1 is {answer_1}")
+            assert r0 in faces_wrap[cube]
            return faces_wrap[cube][r0](y0, x0)
-y2, x2, r2 = run(wrap_part_2)
+        def run(
-answer_2 = 1000 * (1 + y2) + 4 * (1 + x2) + SCORES[r2]
+            wrap: Callable[[int, int, str], tuple[int, int, str]],
-print(f"answer 2 is {answer_2}")
+        ) -> tuple[int, int, str]:
            y0 = 0
            x0 = np.where(board[0] == EMPTY)[0][0]
            r0 = "E"
            for direction in directions:
                if isinstance(direction, int):
                    while direction > 0:
                        if r0 == "E":
                            xi = np.where(
                                board[y0, x0 + 1 : x0 + direction + 1] == WALL
                            )[0]
                            if len(xi):
                                x0 = x0 + xi[0]
                                direction = 0
                            elif (
                                x0 + direction < board.shape[1]
                                and board[y0, x0 + direction] == EMPTY
                            ):
                                x0 = x0 + direction
                                direction = 0
                            else:
                                y0_t, x0_t, r0_t = wrap(y0, x0, r0)
                                if board[y0_t, x0_t] == WALL:
                                    x0 = row_last_non_void[y0]
                                    direction = 0
                                else:
                                    direction = (
                                        direction - (row_last_non_void[y0] - x0) - 1
                                    )
                                    y0, x0, r0 = y0_t, x0_t, r0_t
                        elif r0 == "S":
                            yi = np.where(
                                board[y0 + 1 : y0 + direction + 1, x0] == WALL
                            )[0]
                            if len(yi):
                                y0 = y0 + yi[0]
                                direction = 0
                            elif (
                                y0 + direction < board.shape[0]
                                and board[y0 + direction, x0] == EMPTY
                            ):
                                y0 = y0 + direction
                                direction = 0
                            else:
                                y0_t, x0_t, r0_t = wrap(y0, x0, r0)
                                if board[y0_t, x0_t] == WALL:
                                    y0 = col_last_non_void[x0]
                                    direction = 0
                                else:
                                    direction = (
                                        direction - (col_last_non_void[x0] - y0) - 1
                                    )
                                    y0, x0, r0 = y0_t, x0_t, r0_t
                        elif r0 == "W":
                            left = max(x0 - direction - 1, 0)
                            xi = np.where(board[y0, left:x0] == WALL)[0]
                            if len(xi):
                                x0 = left + xi[-1] + 1
                                direction = 0
                            elif (
                                x0 - direction >= 0
                                and board[y0, x0 - direction] == EMPTY
                            ):
                                x0 = x0 - direction
                                direction = 0
                            else:
                                y0_t, x0_t, r0_t = wrap(y0, x0, r0)
                                if board[y0_t, x0_t] == WALL:
                                    x0 = row_first_non_void[y0]
                                    direction = 0
                                else:
                                    direction = (
                                        direction - (x0 - row_first_non_void[y0]) - 1
                                    )
                                    y0, x0, r0 = y0_t, x0_t, r0_t
                        elif r0 == "N":
                            top = max(y0 - direction - 1, 0)
                            yi = np.where(board[top:y0, x0] == WALL)[0]
                            if len(yi):
                                y0 = top + yi[-1] + 1
                                direction = 0
                            elif (
                                y0 - direction >= 0
                                and board[y0 - direction, x0] == EMPTY
                            ):
                                y0 = y0 - direction
                                direction = 0
                            else:
                                y0_t, x0_t, r0_t = wrap(y0, x0, r0)
                                if board[y0_t, x0_t] == WALL:
                                    y0 = col_first_non_void[x0]
                                    direction = 0
                                else:
                                    direction = (
                                        direction - (y0 - col_first_non_void[x0]) - 1
                                    )
                                    y0, x0, r0 = y0_t, x0_t, r0_t
                else:
                    r0 = {
                        "E": {"L": "N", "R": "S"},
                        "N": {"L": "W", "R": "E"},
                        "W": {"L": "S", "R": "N"},
                        "S": {"L": "E", "R": "W"},
                    }[r0][direction]
            return y0, x0, r0
        y1, x1, r1 = run(wrap_part_1)
        yield 1000 * (1 + y1) + 4 * (1 + x1) + SCORES[r1]
        y2, x2, r2 = run(wrap_part_2)
        yield 1000 * (1 + y2) + 4 * (1 + x2) + SCORES[r2]
--- a/src/holt59/aoc/2022/day23.py
+++ b/src/holt59/aoc/2022/day23.py
@ -1,6 +1,8 @@
 import itertools
 import sys
 from collections import defaultdict
 from typing import Any, Iterator
 from ..base import BaseSolver
 Directions = list[
    tuple[
@ -18,22 +20,10 @@ DIRECTIONS: Directions = [
 def min_max_yx(positions: set[tuple[int, int]]) -> tuple[int, int, int, int]:
-    ys, xs = {y for y, x in positions}, {x for y, x in positions}
+    ys, xs = {y for y, _x in positions}, {x for _y, x in positions}
    return min(ys), min(xs), max(ys), max(xs)
 def print_positions(positions: set[tuple[int, int]]):
    min_y, min_x, max_y, max_x = min_max_yx(positions)
    print(
        "\n".join(
            "".join(
                "#" if (y, x) in positions else "." for x in range(min_x - 1, max_x + 2)
            )
            for y in range(min_y - 1, max_y + 2)
        )
    )
 def round(
    positions: set[tuple[int, int]],
    directions: Directions,
@ -69,35 +59,38 @@ def round(
    directions.append(directions.pop(0))
-POSITIONS = {
+class Solver(BaseSolver):
-    (i, j)
+    def solve(self, input: str) -> Iterator[Any]:
-    for i, row in enumerate(sys.stdin.read().splitlines())
+        POSITIONS = {
-    for j, col in enumerate(row)
+            (i, j)
-    if col == "#"
+            for i, row in enumerate(input.splitlines())
-}
+            for j, col in enumerate(row)
            if col == "#"
        }
-# === part 1 ===
+        # === part 1 ===
-p1, d1 = POSITIONS.copy(), DIRECTIONS.copy()
+        p1, d1 = POSITIONS.copy(), DIRECTIONS.copy()
-for r in range(10):
+        for _ in range(10):
-    round(p1, d1)
+            round(p1, d1)
-min_y, min_x, max_y, max_x = min_max_yx(p1)
+        min_y, min_x, max_y, max_x = min_max_yx(p1)
-answer_1 = sum(
+        yield sum(
-    (y, x) not in p1 for y in range(min_y, max_y + 1) for x in range(min_x, max_x + 1)
+            (y, x) not in p1
-)
+            for y in range(min_y, max_y + 1)
-print(f"answer 1 is {answer_1}")
+            for x in range(min_x, max_x + 1)
        )
-# === part 2 ===
+        # === part 2 ===
-p2, d2 = POSITIONS.copy(), DIRECTIONS.copy()
+        p2, d2 = POSITIONS.copy(), DIRECTIONS.copy()
-answer_2 = 0
+        answer_2 = 0
-while True:
+        while True:
-    answer_2 += 1
+            answer_2 += 1
-    backup = p2.copy()
+            backup = p2.copy()
-    round(p2, d2)
+            round(p2, d2)
-    if backup == p2:
+            if backup == p2:
-        break
+                break
-print(f"answer 2 is {answer_2}")
+        yield answer_2
--- a/src/holt59/aoc/2022/day24.py
+++ b/src/holt59/aoc/2022/day24.py
@ -1,98 +1,117 @@
 import heapq
 import math
 import sys
 from collections import defaultdict
 from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 winds = {
    (i - 1, j - 1, lines[i][j])
    for i in range(1, len(lines) - 1)
    for j in range(1, len(lines[i]) - 1)
    if lines[i][j] != "."
 }
 n_rows, n_cols = len(lines) - 2, len(lines[0]) - 2
 CYCLE = math.lcm(n_rows, n_cols)
 east_winds = [{j for j in range(n_cols) if (i, j, ">") in winds} for i in range(n_rows)]
 west_winds = [{j for j in range(n_cols) if (i, j, "<") in winds} for i in range(n_rows)]
 north_winds = [
    {i for i in range(n_rows) if (i, j, "^") in winds} for j in range(n_cols)
 ]
 south_winds = [
    {i for i in range(n_rows) if (i, j, "v") in winds} for j in range(n_cols)
 ]
-def run(start: tuple[int, int], start_cycle: int, end: tuple[int, int]):
+class Solver(BaseSolver):
-    def heuristic(y: int, x: int) -> int:
+    def solve(self, input: str) -> Iterator[Any]:
-        return abs(end[0] - y) + abs(end[1] - x)
+        lines = [line.strip() for line in input.splitlines()]
-    # (distance + heuristic, distance, (start_pos, cycle))
+        winds = {
-    queue = [(heuristic(start[0], start[1]), 0, ((start[0], start[1]), start_cycle))]
+            (i - 1, j - 1, lines[i][j])
-    visited: set[tuple[tuple[int, int], int]] = set()
+            for i in range(1, len(lines) - 1)
-    distances: dict[tuple[int, int], dict[int, int]] = defaultdict(lambda: {})
+            for j in range(1, len(lines[i]) - 1)
            if lines[i][j] != "."
        }
-    while queue:
+        n_rows, n_cols = len(lines) - 2, len(lines[0]) - 2
-        _, distance, ((y, x), cycle) = heapq.heappop(queue)
+        CYCLE = math.lcm(n_rows, n_cols)
-        if ((y, x), cycle) in visited:
+        east_winds = [
-            continue
+            {j for j in range(n_cols) if (i, j, ">") in winds} for i in range(n_rows)
        ]
        west_winds = [
            {j for j in range(n_cols) if (i, j, "<") in winds} for i in range(n_rows)
        ]
        north_winds = [
            {i for i in range(n_rows) if (i, j, "^") in winds} for j in range(n_cols)
        ]
        south_winds = [
            {i for i in range(n_rows) if (i, j, "v") in winds} for j in range(n_cols)
        ]
-        distances[y, x][cycle] = distance
+        def run(start: tuple[int, int], start_cycle: int, end: tuple[int, int]):
            def heuristic(y: int, x: int) -> int:
                return abs(end[0] - y) + abs(end[1] - x)
-        visited.add(((y, x), cycle))
+            # (distance + heuristic, distance, (start_pos, cycle))
            queue = [
                (heuristic(start[0], start[1]), 0, ((start[0], start[1]), start_cycle))
            ]
            visited: set[tuple[tuple[int, int], int]] = set()
            distances: dict[tuple[int, int], dict[int, int]] = defaultdict(lambda: {})
-        if (y, x) == (end[0], end[1]):
+            while queue:
-            break
+                _, distance, ((y, x), cycle) = heapq.heappop(queue)
-        for dy, dx in (0, 0), (-1, 0), (1, 0), (0, -1), (0, 1):
+                if ((y, x), cycle) in visited:
            ty = y + dy
            tx = x + dx
            n_cycle = (cycle + 1) % CYCLE
            if (ty, tx) == end:
                heapq.heappush(queue, (distance + 1, distance + 1, ((ty, tx), n_cycle)))
                break
            if ((ty, tx), n_cycle) in visited:
                continue
            if (ty, tx) != start and (ty < 0 or tx < 0 or ty >= n_rows or tx >= n_cols):
                continue
            if (ty, tx) != start:
                if (ty - n_cycle) % n_rows in south_winds[tx]:
                    continue
                if (ty + n_cycle) % n_rows in north_winds[tx]:
                    continue
                if (tx + n_cycle) % n_cols in west_winds[ty]:
                    continue
                if (tx - n_cycle) % n_cols in east_winds[ty]:
                    continue
-            heapq.heappush(
+                distances[y, x][cycle] = distance
                queue,
                ((heuristic(ty, tx) + distance + 1, distance + 1, ((ty, tx), n_cycle))),
            )
-    return distances, next(iter(distances[end].values()))
+                visited.add(((y, x), cycle))
                if (y, x) == (end[0], end[1]):
                    break
-start = (
+                for dy, dx in (0, 0), (-1, 0), (1, 0), (0, -1), (0, 1):
-    -1,
+                    ty = y + dy
-    next(j for j in range(1, len(lines[0]) - 1) if lines[0][j] == ".") - 1,
+                    tx = x + dx
 )
 end = (
    n_rows,
    next(j for j in range(1, len(lines[-1]) - 1) if lines[-1][j] == ".") - 1,
 )
-distances_1, forward_1 = run(start, 0, end)
+                    n_cycle = (cycle + 1) % CYCLE
 print(f"answer 1 is {forward_1}")
-distances_2, return_1 = run(end, next(iter(distances_1[end].keys())), start)
+                    if (ty, tx) == end:
-distances_3, forward_2 = run(start, next(iter(distances_2[start].keys())), end)
+                        heapq.heappush(
-print(f"answer 2 is {forward_1 + return_1 + forward_2}")
+                            queue, (distance + 1, distance + 1, ((ty, tx), n_cycle))
                        )
                        break
                    if ((ty, tx), n_cycle) in visited:
                        continue
                    if (ty, tx) != start and (
                        ty < 0 or tx < 0 or ty >= n_rows or tx >= n_cols
                    ):
                        continue
                    if (ty, tx) != start:
                        if (ty - n_cycle) % n_rows in south_winds[tx]:
                            continue
                        if (ty + n_cycle) % n_rows in north_winds[tx]:
                            continue
                        if (tx + n_cycle) % n_cols in west_winds[ty]:
                            continue
                        if (tx - n_cycle) % n_cols in east_winds[ty]:
                            continue
                    heapq.heappush(
                        queue,
                        (
                            (
                                heuristic(ty, tx) + distance + 1,
                                distance + 1,
                                ((ty, tx), n_cycle),
                            )
                        ),
                    )
            return distances, next(iter(distances[end].values()))
        start = (
            -1,
            next(j for j in range(1, len(lines[0]) - 1) if lines[0][j] == ".") - 1,
        )
        end = (
            n_rows,
            next(j for j in range(1, len(lines[-1]) - 1) if lines[-1][j] == ".") - 1,
        )
        distances_1, forward_1 = run(start, 0, end)
        yield forward_1
        distances_2, return_1 = run(end, next(iter(distances_1[end].keys())), start)
        _distances_3, forward_2 = run(start, next(iter(distances_2[start].keys())), end)
        yield forward_1 + return_1 + forward_2
--- a/src/holt59/aoc/2022/day25.py
+++ b/src/holt59/aoc/2022/day25.py
@ -1,27 +1,28 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 coeffs = {"2": 2, "1": 1, "0": 0, "-": -1, "=": -2}
-def snafu2number(number: str) -> int:
+class Solver(BaseSolver):
-    value = 0
+    def solve(self, input: str) -> Iterator[Any]:
-    for c in number:
+        lines = [line.strip() for line in input.splitlines()]
        value *= 5
        value += coeffs[c]
    return value
        coeffs = {"2": 2, "1": 1, "0": 0, "-": -1, "=": -2}
-def number2snafu(number: int) -> str:
+        def snafu2number(number: str) -> int:
-    values = ["0", "1", "2", "=", "-"]
+            value = 0
-    res = ""
+            for c in number:
-    while number > 0:
+                value *= 5
-        mod = number % 5
+                value += coeffs[c]
-        res = res + values[mod]
+            return value
        number = number // 5 + int(mod >= 3)
    return "".join(reversed(res))
        def number2snafu(number: int) -> str:
            values = ["0", "1", "2", "=", "-"]
            res = ""
            while number > 0:
                mod = number % 5
                res = res + values[mod]
                number = number // 5 + int(mod >= 3)
            return "".join(reversed(res))
-answer_1 = number2snafu(sum(map(snafu2number, lines)))
+        yield number2snafu(sum(map(snafu2number, lines)))
 print(f"answer 1 is {answer_1}")
--- a/src/holt59/aoc/2022/day3.py
+++ b/src/holt59/aoc/2022/day3.py
@ -1,23 +1,28 @@
 import string
-import sys
+from typing import Any, Iterator
-lines = [line.strip() for line in sys.stdin.readlines()]
+from ..base import BaseSolver
 # extract content of each part
 parts = [(set(line[: len(line) // 2]), set(line[len(line) // 2 :])) for line in lines]
-# priorities
+class Solver(BaseSolver):
-priorities = {c: i + 1 for i, c in enumerate(string.ascii_letters)}
+    def solve(self, input: str) -> Iterator[Any]:
        lines = [line.strip() for line in input.splitlines()]
-# part 1
+        # extract content of each part
-part1 = sum(priorities[c] for p1, p2 in parts for c in p1.intersection(p2))
+        parts = [
-print(f"answer 1 is {part1}")
+            (set(line[: len(line) // 2]), set(line[len(line) // 2 :])) for line in lines
        ]
-# part 2
+        # priorities
-n_per_group = 3
+        priorities = {c: i + 1 for i, c in enumerate(string.ascii_letters)}
-part2 = sum(
+
-    priorities[c]
+        # part 1
-    for i in range(0, len(lines), n_per_group)
+        yield sum(priorities[c] for p1, p2 in parts for c in p1.intersection(p2))
-    for c in set(lines[i]).intersection(*lines[i + 1 : i + n_per_group])
+
-)
+        # part 2
-print(f"answer 2 is {part2}")
+        n_per_group = 3
        yield sum(
            priorities[c]
            for i in range(0, len(lines), n_per_group)
            for c in set(lines[i]).intersection(*lines[i + 1 : i + n_per_group])
        )
--- a/src/holt59/aoc/2022/day4.py
+++ b/src/holt59/aoc/2022/day4.py
@ -1,6 +1,6 @@
-import sys
+from typing import Any, Iterator
-lines = [line.strip() for line in sys.stdin.readlines()]
+from ..base import BaseSolver
 def make_range(value: str) -> set[int]:
@ -8,10 +8,13 @@ def make_range(value: str) -> set[int]:
    return set(range(int(parts[0]), int(parts[1]) + 1))
-sections = [tuple(make_range(part) for part in line.split(",")) for line in lines]
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = [line.strip() for line in input.splitlines()]
-answer_1 = sum(s1.issubset(s2) or s2.issubset(s1) for s1, s2 in sections)
+        sections = [
-print(f"answer 1 is {answer_1}")
+            tuple(make_range(part) for part in line.split(",")) for line in lines
        ]
-answer_2 = sum(bool(s1.intersection(s2)) for s1, s2 in sections)
+        yield sum(s1.issubset(s2) or s2.issubset(s1) for s1, s2 in sections)
-print(f"answer 1 is {answer_2}")
+        yield sum(bool(s1.intersection(s2)) for s1, s2 in sections)
--- a/src/holt59/aoc/2022/day5.py
+++ b/src/holt59/aoc/2022/day5.py
@ -1,41 +1,43 @@
 import copy
-import sys
+from typing import Any, Iterator
-blocks_s, moves_s = (part.splitlines() for part in sys.stdin.read().split("\n\n"))
+from ..base import BaseSolver
 blocks: dict[str, list[str]] = {stack: [] for stack in blocks_s[-1].split()}
-# this codes assumes that the lines are regular, i.e., 4 characters per "crate" in the
+class Solver(BaseSolver):
-# form of '[X] ' (including the trailing space)
+    def solve(self, input: str) -> Iterator[Any]:
-#
+        blocks_s, moves_s = (part.splitlines() for part in input.split("\n\n"))
 for block in blocks_s[-2::-1]:
    for stack, index in zip(blocks, range(0, len(block), 4)):
        crate = block[index + 1 : index + 2].strip()
-        if crate:
+        blocks: dict[str, list[str]] = {stack: [] for stack in blocks_s[-1].split()}
            blocks[stack].append(crate)
-# part 1 - deep copy for part 2
+        # this codes assumes that the lines are regular, i.e., 4 characters per "crate" in the
-blocks_1 = copy.deepcopy(blocks)
+        # form of '[X] ' (including the trailing space)
        #
        for block in blocks_s[-2::-1]:
            for stack, index in zip(blocks, range(0, len(block), 4)):
                crate = block[index + 1 : index + 2].strip()
-for move in moves_s:
+                if crate:
-    _, count_s, _, from_, _, to_ = move.strip().split()
+                    blocks[stack].append(crate)
-    for _i in range(int(count_s)):
+        # part 1 - deep copy for part 2
-        blocks_1[to_].append(blocks_1[from_].pop())
+        blocks_1 = copy.deepcopy(blocks)
-# part 2
+        for move in moves_s:
-blocks_2 = copy.deepcopy(blocks)
+            _, count_s, _, from_, _, to_ = move.strip().split()
-for move in moves_s:
+            for _i in range(int(count_s)):
-    _, count_s, _, from_, _, to_ = move.strip().split()
+                blocks_1[to_].append(blocks_1[from_].pop())
    count = int(count_s)
-    blocks_2[to_].extend(blocks_2[from_][-count:])
+        # part 2
-    del blocks_2[from_][-count:]
+        blocks_2 = copy.deepcopy(blocks)
-answer_1 = "".join(s[-1] for s in blocks_1.values())
+        for move in moves_s:
-print(f"answer 1 is {answer_1}")
+            _, count_s, _, from_, _, to_ = move.strip().split()
            count = int(count_s)
-answer_2 = "".join(s[-1] for s in blocks_2.values())
+            blocks_2[to_].extend(blocks_2[from_][-count:])
-print(f"answer 2 is {answer_2}")
+            del blocks_2[from_][-count:]
        yield "".join(s[-1] for s in blocks_1.values())
        yield "".join(s[-1] for s in blocks_2.values())
--- a/src/holt59/aoc/2022/day6.py
+++ b/src/holt59/aoc/2022/day6.py
@ -1,4 +1,6 @@
-import sys
+from typing import Any, Iterator
 from ..base import BaseSolver
 def index_of_first_n_differents(data: str, n: int) -> int:
@ -8,8 +10,7 @@ def index_of_first_n_differents(data: str, n: int) -> int:
    return -1
-data = sys.stdin.read().strip()
+class Solver(BaseSolver):
-
+    def solve(self, input: str) -> Iterator[Any]:
-
+        yield index_of_first_n_differents(input, 4)
-print(f"answer 1 is {index_of_first_n_differents(data, 4)}")
+        yield index_of_first_n_differents(input, 14)
 print(f"answer 2 is {index_of_first_n_differents(data, 14)}")
--- a/src/holt59/aoc/2022/day7.py
+++ b/src/holt59/aoc/2022/day7.py
@ -1,80 +1,81 @@
 import sys
 from pathlib import Path
 from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 # we are going to use Path to create path and go up/down in the file tree since it
 # implements everything we need
 #
 # we can use .resolve() to get normalized path, although this will add C:\ to all paths
 # on Windows but that is not an issue since only the sizes matter
 #
 # mapping from path to list of files or directories
 trees: dict[Path, list[Path]] = {}
 # mapping from paths to either size (for file) or -1 for directory
 sizes: dict[Path, int] = {}
 # first line must be a cd otherwise we have no idea where we are
 assert lines[0].startswith("$ cd")
 base_path = Path(lines[0].strip("$").split()[1]).resolve()
 cur_path = base_path
 trees[cur_path] = []
 sizes[cur_path] = -1
 for line in lines[1:]:
    # command
    if line.startswith("$"):
        parts = line.strip("$").strip().split()
        command = parts[0]
        if command == "cd":
            cur_path = cur_path.joinpath(parts[1]).resolve()
            # just initialize the lis of files if not already done
            if cur_path not in trees:
                trees[cur_path] = []
        else:
            # nothing to do here
            pass
    # fill the current path
    else:
        parts = line.split()
        name: str = parts[1]
        if line.startswith("dir"):
            size = -1
        else:
            size = int(parts[0])
        path = cur_path.joinpath(name)
        trees[cur_path].append(path)
        sizes[path] = size
-def compute_size(path: Path) -> int:
+class Solver(BaseSolver):
-    size = sizes[path]
+    def solve(self, input: str) -> Iterator[Any]:
        lines = [line.strip() for line in input.splitlines()]
-    if size >= 0:
+        # we are going to use Path to create path and go up/down in the file tree since it
-        return size
+        # implements everything we need
        #
        # we can use .resolve() to get normalized path, although this will add C:\ to all paths
        # on Windows but that is not an issue since only the sizes matter
        #
-    return sum(compute_size(sub) for sub in trees[path])
+        # mapping from path to list of files or directories
        trees: dict[Path, list[Path]] = {}
        # mapping from paths to either size (for file) or -1 for directory
        sizes: dict[Path, int] = {}
-acc_sizes = {path: compute_size(path) for path in trees}
+        # first line must be a cd otherwise we have no idea where we are
        assert lines[0].startswith("$ cd")
        base_path = Path(lines[0].strip("$").split()[1]).resolve()
        cur_path = base_path
-# part 1
+        trees[cur_path] = []
-answer_1 = sum(size for size in acc_sizes.values() if size <= 100_000)
+        sizes[cur_path] = -1
 print(f"answer 1 is {answer_1}")
-# part 2
+        for line in lines[1:]:
-total_space = 70_000_000
+            # command
-update_space = 30_000_000
+            if line.startswith("$"):
-free_space = total_space - acc_sizes[base_path]
+                parts = line.strip("$").strip().split()
                command = parts[0]
-to_free_space = update_space - free_space
+                if command == "cd":
                    cur_path = cur_path.joinpath(parts[1]).resolve()
-answer_2 = min(size for size in acc_sizes.values() if size >= to_free_space)
+                    # just initialize the lis of files if not already done
-print(f"answer 2 is {answer_2}")
+                    if cur_path not in trees:
                        trees[cur_path] = []
                else:
                    # nothing to do here
                    pass
            # fill the current path
            else:
                parts = line.split()
                name: str = parts[1]
                if line.startswith("dir"):
                    size = -1
                else:
                    size = int(parts[0])
                path = cur_path.joinpath(name)
                trees[cur_path].append(path)
                sizes[path] = size
        def compute_size(path: Path) -> int:
            size = sizes[path]
            if size >= 0:
                return size
            return sum(compute_size(sub) for sub in trees[path])
        acc_sizes = {path: compute_size(path) for path in trees}
        # part 1
        yield sum(size for size in acc_sizes.values() if size <= 100_000)
        # part 2
        total_space = 70_000_000
        update_space = 30_000_000
        free_space = total_space - acc_sizes[base_path]
        to_free_space = update_space - free_space
        yield min(size for size in acc_sizes.values() if size >= to_free_space)
--- a/src/holt59/aoc/2022/day8.py
+++ b/src/holt59/aoc/2022/day8.py
@ -1,53 +1,54 @@
-import sys
+from typing import Any, Iterator
 import numpy as np
 from numpy.typing import NDArray
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 trees = np.array([[int(x) for x in row] for row in lines])
-# answer 1
+class Solver(BaseSolver):
-highest_trees = np.ones(trees.shape + (4,), dtype=int) * -1
+    def solve(self, input: str) -> Iterator[Any]:
-highest_trees[1:-1, 1:-1] = [
+        lines = [line.strip() for line in input.splitlines()]
-    [
+
-        [
+        trees = np.array([[int(x) for x in row] for row in lines])
-            trees[:i, j].max(),
+
-            trees[i + 1 :, j].max(),
+        # answer 1
-            trees[i, :j].max(),
+        highest_trees = np.ones(trees.shape + (4,), dtype=int) * -1
-            trees[i, j + 1 :].max(),
+        highest_trees[1:-1, 1:-1] = [
            [
                [
                    trees[:i, j].max(),
                    trees[i + 1 :, j].max(),
                    trees[i, :j].max(),
                    trees[i, j + 1 :].max(),
                ]
                for j in range(1, trees.shape[1] - 1)
            ]
            for i in range(1, trees.shape[0] - 1)
        ]
        for j in range(1, trees.shape[1] - 1)
    ]
    for i in range(1, trees.shape[0] - 1)
 ]
-answer_1 = (highest_trees.min(axis=2) < trees).sum()
+        yield (highest_trees.min(axis=2) < trees).sum()
 print(f"answer 1 is {answer_1}")
        def viewing_distance(row_of_trees: NDArray[np.int_], value: int) -> int:
            w = np.where(row_of_trees >= value)[0]
-def viewing_distance(row_of_trees: NDArray[np.int_], value: int) -> int:
+            if not w.size:
-    w = np.where(row_of_trees >= value)[0]
+                return len(row_of_trees)
-    if not w.size:
+            return w[0] + 1
        return len(row_of_trees)
-    return w[0] + 1
+        # answer 2
-
+        v_distances = np.zeros(trees.shape + (4,), dtype=int)
-
+        v_distances[1:-1, 1:-1, :] = [
-# answer 2
+            [
-v_distances = np.zeros(trees.shape + (4,), dtype=int)
+                [
-v_distances[1:-1, 1:-1, :] = [
+                    viewing_distance(trees[i - 1 :: -1, j], trees[i, j]),
-    [
+                    viewing_distance(trees[i, j - 1 :: -1], trees[i, j]),
-        [
+                    viewing_distance(trees[i, j + 1 :], trees[i, j]),
-            viewing_distance(trees[i - 1 :: -1, j], trees[i, j]),
+                    viewing_distance(trees[i + 1 :, j], trees[i, j]),
-            viewing_distance(trees[i, j - 1 :: -1], trees[i, j]),
+                ]
-            viewing_distance(trees[i, j + 1 :], trees[i, j]),
+                for j in range(1, trees.shape[1] - 1)
-            viewing_distance(trees[i + 1 :, j], trees[i, j]),
+            ]
            for i in range(1, trees.shape[0] - 1)
        ]
-        for j in range(1, trees.shape[1] - 1)
+        yield np.prod(v_distances, axis=2).max()
    ]
    for i in range(1, trees.shape[0] - 1)
 ]
 answer_2 = np.prod(v_distances, axis=2).max()
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2022/day9.py
+++ b/src/holt59/aoc/2022/day9.py
@ -1,7 +1,10 @@
-import sys
+import itertools as it
 from typing import Any, Iterator
 import numpy as np
 from ..base import BaseSolver
 def move(head: tuple[int, int], command: str) -> tuple[int, int]:
    h_col, h_row = head
@ -43,17 +46,14 @@ def run(commands: list[str], n_blocks: int) -> list[tuple[int, int]]:
    return visited
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = [line.strip() for line in input.splitlines()]
-# flatten the commands
+        # flatten the commands
-commands: list[str] = []
+        commands = list(
-for line in lines:
+            it.chain(*(p[0] * int(p[1]) for line in lines if (p := line.split())))
-    d, c = line.split()
+        )
    commands.extend(d * int(c))
-
+        yield len(set(run(commands, n_blocks=2)))
-visited_1 = run(commands, n_blocks=2)
+        yield len(set(run(commands, n_blocks=10)))
 print(f"answer 1 is {len(set(visited_1))}")
 visited_2 = run(commands, n_blocks=10)
 print(f"answer 2 is {len(set(visited_2))}")
--- a/src/holt59/aoc/2023/day1.py
+++ b/src/holt59/aoc/2023/day1.py
@ -1,27 +1,9 @@
-import sys
+from typing import Any, Iterator
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 lookups_1 = {str(d): d for d in range(1, 10)}
 lookups_2 = lookups_1 | {
    d: i + 1
    for i, d in enumerate(
        (
            "one",
            "two",
            "three",
            "four",
            "five",
            "six",
            "seven",
            "eight",
            "nine",
        )
    )
 }
-def find_values(lookups: dict[str, int]) -> list[int]:
+def find_values(lines: list[str], lookups: dict[str, int]) -> list[int]:
    values: list[int] = []
    for line in filter(bool, lines):
@ -41,5 +23,27 @@ def find_values(lookups: dict[str, int]) -> list[int]:
    return values
-print(f"answer 1 is {sum(find_values(lookups_1))}")
+class Solver(BaseSolver):
-print(f"answer 2 is {sum(find_values(lookups_2))}")
+    def solve(self, input: str) -> Iterator[Any]:
        lookups_1 = {str(d): d for d in range(1, 10)}
        lookups_2 = lookups_1 | {
            d: i + 1
            for i, d in enumerate(
                (
                    "one",
                    "two",
                    "three",
                    "four",
                    "five",
                    "six",
                    "seven",
                    "eight",
                    "nine",
                )
            )
        }
        lines = input.splitlines()
        yield sum(find_values(lines, lookups_1))
        yield sum(find_values(lines, lookups_2))
--- a/src/holt59/aoc/2023/day10.py
+++ b/src/holt59/aoc/2023/day10.py
@ -1,100 +1,99 @@
-import os
+from typing import Any, Iterator, Literal, cast
 import sys
 from typing import Literal, cast
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 Symbol = Literal["|", "-", "L", "J", "7", "F", ".", "S"]
 lines: list[list[Symbol]] = [
    [cast(Symbol, symbol) for symbol in line] for line in sys.stdin.read().splitlines()
 ]
-# find starting point
+class Solver(BaseSolver):
-si, sj = next(
+    def solve(self, input: str) -> Iterator[Any]:
-    (i, j)
+        lines: list[list[Symbol]] = [
-    for i in range(len(lines))
+            [cast(Symbol, symbol) for symbol in line] for line in input.splitlines()
-    for j in range(len(lines[0]))
+        ]
    if lines[i][j] == "S"
 )
-# find one of the two outputs
+        # find starting point
-ni, nj = si, sj
+        si, sj = next(
-for ni, nj, chars in (
+            (i, j)
-    (si - 1, sj, "|7F"),
+            for i in range(len(lines))
-    (si + 1, sj, "|LJ"),
+            for j in range(len(lines[0]))
-    (si, sj - 1, "-LF"),
+            if lines[i][j] == "S"
-    (si, sj + 1, "-J7"),
+        )
 ):
    if lines[ni][nj] in chars:
        break
-# part 1 - find the loop (re-used in part 2)
+        # find one of the two outputs
-loop = [(si, sj), (ni, nj)]
+        ni, nj = si, sj
-while True:
+        for ni, nj, chars in (
-    pi, pj = loop[-2]
+            (si - 1, sj, "|7F"),
-    i, j = loop[-1]
+            (si + 1, sj, "|LJ"),
            (si, sj - 1, "-LF"),
            (si, sj + 1, "-J7"),
        ):
            if lines[ni][nj] in chars:
                break
-    sym = lines[i][j]
+        # part 1 - find the loop (re-used in part 2)
        loop = [(si, sj), (ni, nj)]
        while True:
            pi, pj = loop[-2]
            i, j = loop[-1]
-    if sym == "|" and pi > i or sym in "JL" and pi == i:
+            sym = lines[i][j]
        i -= 1
    elif sym == "|" and pi < i or sym in "7F" and pi == i:
        i += 1
    elif sym == "-" and pj > j or sym in "J7" and pj == j:
        j -= 1
    elif sym == "-" and pj < j or sym in "LF" and pj == j:
        j += 1
-    if (i, j) == (si, sj):
+            if sym == "|" and pi > i or sym in "JL" and pi == i:
-        break
+                i -= 1
            elif sym == "|" and pi < i or sym in "7F" and pi == i:
                i += 1
            elif sym == "-" and pj > j or sym in "J7" and pj == j:
                j -= 1
            elif sym == "-" and pj < j or sym in "LF" and pj == j:
                j += 1
    loop.append((i, j))
 answer_1 = len(loop) // 2
 print(f"answer 1 is {answer_1}")
 # part 2
 # replace S by an appropriate character for the loop below
 di1, dj1 = loop[1][0] - loop[0][0], loop[1][1] - loop[0][1]
 di2, dj2 = loop[0][0] - loop[-1][0], loop[0][1] - loop[-1][1]
 mapping: dict[tuple[int, int], dict[tuple[int, int], Symbol]] = {
    (0, 1): {(0, 1): "-", (-1, 0): "F", (1, 0): "L"},
    (0, -1): {(0, -1): "-", (-1, 0): "7", (1, 0): "J"},
    (1, 0): {(1, 0): "|", (0, 1): "7", (0, -1): "F"},
    (-1, 0): {(-1, 0): "|", (0, -1): "L", (0, 1): "J"},
 }
 lines[si][sj] = mapping[di1, dj1][di2, dj2]
 # find the points inside the loop using an adaptation of ray casting for a discrete
 # grid (https://stackoverflow.com/a/218081/2666289)
 #
 # use a set for faster '... in loop' check
 #
 loop_s = set(loop)
 inside: set[tuple[int, int]] = set()
 for i in range(len(lines)):
    cnt = 0
    for j in range(len(lines[0])):
        if (i, j) not in loop_s and cnt % 2 == 1:
            inside.add((i, j))
        if (i, j) in loop_s and lines[i][j] in "|LJ":
            cnt += 1
 if VERBOSE:
    for i in range(len(lines)):
        for j in range(len(lines[0])):
            if (i, j) == (si, sj):
-                print("\033[91mS\033[0m", end="")
+                break
            elif (i, j) in loop:
                print(lines[i][j], end="")
            elif (i, j) in inside:
                print("\033[92mI\033[0m", end="")
            else:
                print(".", end="")
        print()
-answer_2 = len(inside)
+            loop.append((i, j))
-print(f"answer 2 is {answer_2}")
+
        yield len(loop) // 2
        # part 2
        # replace S by an appropriate character for the loop below
        di1, dj1 = loop[1][0] - loop[0][0], loop[1][1] - loop[0][1]
        di2, dj2 = loop[0][0] - loop[-1][0], loop[0][1] - loop[-1][1]
        mapping: dict[tuple[int, int], dict[tuple[int, int], Symbol]] = {
            (0, 1): {(0, 1): "-", (-1, 0): "F", (1, 0): "L"},
            (0, -1): {(0, -1): "-", (-1, 0): "7", (1, 0): "J"},
            (1, 0): {(1, 0): "|", (0, 1): "7", (0, -1): "F"},
            (-1, 0): {(-1, 0): "|", (0, -1): "L", (0, 1): "J"},
        }
        lines[si][sj] = mapping[di1, dj1][di2, dj2]
        # find the points inside the loop using an adaptation of ray casting for a discrete
        # grid (https://stackoverflow.com/a/218081/2666289)
        #
        # use a set for faster '... in loop' check
        #
        loop_s = set(loop)
        inside: set[tuple[int, int]] = set()
        for i in range(len(lines)):
            cnt = 0
            for j in range(len(lines[0])):
                if (i, j) not in loop_s and cnt % 2 == 1:
                    inside.add((i, j))
                if (i, j) in loop_s and lines[i][j] in "|LJ":
                    cnt += 1
        if self.files:
            rows = [["." for _j in range(len(lines[0]))] for _i in range(len(lines))]
            rows[si][sj] = "\033[91mS\033[0m"
            for i, j in loop:
                rows[i][j] = lines[i][j]
            for i, j in inside:
                rows[i][j] = "\033[92mI\033[0m"
            self.files.create(
                "output.txt", "\n".join("".join(row) for row in rows).encode(), True
            )
        yield len(inside)
--- a/src/holt59/aoc/2023/day11.py
+++ b/src/holt59/aoc/2023/day11.py
@ -1,41 +1,42 @@
-import sys
+from typing import Any, Iterator
 import numpy as np
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 data = np.array([[c == "#" for c in line] for line in lines])
 rows = {c for c in range(data.shape[0]) if not data[c, :].any()}
 columns = {c for c in range(data.shape[1]) if not data[:, c].any()}
 galaxies_y, galaxies_x = np.where(data)  # type: ignore
-def compute_total_distance(expansion: int) -> int:
+class Solver(BaseSolver):
-    distances: list[int] = []
+    def solve(self, input: str) -> Iterator[Any]:
-    for g1 in range(len(galaxies_y)):
+        lines = input.splitlines()
        x1, y1 = int(galaxies_x[g1]), int(galaxies_y[g1])
        for g2 in range(g1 + 1, len(galaxies_y)):
            x2, y2 = int(galaxies_x[g2]), int(galaxies_y[g2])
-            dx = sum(
+        data = np.array([[c == "#" for c in line] for line in lines])
                1 + (expansion - 1) * (x in columns)
                for x in range(min(x1, x2), max(x1, x2))
            )
            dy = sum(
                1 + (expansion - 1) * (y in rows)
                for y in range(min(y1, y2), max(y1, y2))
            )
-            distances.append(dx + dy)
+        rows = {c for c in range(data.shape[0]) if not data[c, :].any()}
-    return sum(distances)
+        columns = {c for c in range(data.shape[1]) if not data[:, c].any()}
        galaxies_y, galaxies_x = np.where(data)  # type: ignore
-# part 1
+        def compute_total_distance(expansion: int) -> int:
-answer_1 = compute_total_distance(2)
+            distances: list[int] = []
-print(f"answer 1 is {answer_1}")
+            for g1 in range(len(galaxies_y)):
                x1, y1 = int(galaxies_x[g1]), int(galaxies_y[g1])
                for g2 in range(g1 + 1, len(galaxies_y)):
                    x2, y2 = int(galaxies_x[g2]), int(galaxies_y[g2])
-# part 2
+                    dx = sum(
-answer_2 = compute_total_distance(1000000)
+                        1 + (expansion - 1) * (x in columns)
-print(f"answer 2 is {answer_2}")
+                        for x in range(min(x1, x2), max(x1, x2))
                    )
                    dy = sum(
                        1 + (expansion - 1) * (y in rows)
                        for y in range(min(y1, y2), max(y1, y2))
                    )
                    distances.append(dx + dy)
            return sum(distances)
        # part 1
        yield compute_total_distance(2)
        # part 2
        yield compute_total_distance(1000000)
--- a/src/holt59/aoc/2023/day12.py
+++ b/src/holt59/aoc/2023/day12.py
@ -1,9 +1,7 @@
 import os
 import sys
 from functools import lru_cache
-from typing import Iterable
+from typing import Any, Iterable, Iterator
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
@lru_cache
@ -77,31 +75,29 @@ def compute_possible_arrangements(
        )
-def compute_all_possible_arrangements(lines: Iterable[str], repeat: int) -> int:
+class Solver(BaseSolver):
-    count = 0
+    def compute_all_possible_arrangements(
        self, lines: Iterable[str], repeat: int
    ) -> int:
        count = 0
-    if VERBOSE:
+        for i_line, line in enumerate(lines):
-        from tqdm import tqdm
+            self.logger.info(f"processing line {i_line}: {line}...")
            parts = line.split(" ")
            count += compute_possible_arrangements(
                tuple(
                    filter(len, "?".join(parts[0] for _ in range(repeat)).split("."))
                ),
                tuple(int(c) for c in parts[1].split(",")) * repeat,
            )
-        lines = tqdm(lines)
+        return count
-    for line in lines:
+    def solve(self, input: str) -> Iterator[Any]:
-        parts = line.split(" ")
+        lines = input.splitlines()
        count += compute_possible_arrangements(
            tuple(filter(len, "?".join(parts[0] for _ in range(repeat)).split("."))),
            tuple(int(c) for c in parts[1].split(",")) * repeat,
        )
-    return count
+        # part 1
        yield self.compute_all_possible_arrangements(lines, 1)
-
+        # part 2
-lines = sys.stdin.read().splitlines()
+        yield self.compute_all_possible_arrangements(lines, 5)
 # part 1
 answer_1 = compute_all_possible_arrangements(lines, 1)
 print(f"answer 1 is {answer_1}")
 # part 2
 answer_2 = compute_all_possible_arrangements(lines, 5)
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day13.py
+++ b/src/holt59/aoc/2023/day13.py
@ -1,5 +1,6 @@
-import sys
+from typing import Any, Callable, Iterator, Literal
-from typing import Callable, Literal
+
 from ..base import BaseSolver
 def split(block: list[str], axis: Literal[0, 1], count: int) -> int:
@ -25,19 +26,18 @@ def split(block: list[str], axis: Literal[0, 1], count: int) -> int:
    return 0
-blocks = [block.splitlines() for block in sys.stdin.read().split("\n\n")]
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        blocks = [block.splitlines() for block in input.split("\n\n")]
        # part 1
        yield sum(
            split(block, axis=1, count=0) + 100 * split(block, axis=0, count=0)
            for block in blocks
        )
-# part 1
+        # part 2
-answer_1 = sum(
+        yield sum(
-    split(block, axis=1, count=0) + 100 * split(block, axis=0, count=0)
+            split(block, axis=1, count=1) + 100 * split(block, axis=0, count=1)
-    for block in blocks
+            for block in blocks
-)
+        )
 print(f"answer 1 is {answer_1}")
 # part 2
 answer_2 = sum(
    split(block, axis=1, count=1) + 100 * split(block, axis=0, count=1)
    for block in blocks
 )
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day14.py
+++ b/src/holt59/aoc/2023/day14.py
@ -1,10 +1,9 @@
-import sys
+from typing import Any, Iterator, TypeAlias
-from typing import TypeAlias
+
 from ..base import BaseSolver
 RockGrid: TypeAlias = list[list[str]]
 rocks0 = [list(line) for line in sys.stdin.read().splitlines()]
 def slide_rocks_top(rocks: RockGrid) -> RockGrid:
    top = [0 if c == "." else 1 for c in rocks[0]]
@ -34,35 +33,38 @@ def cycle(rocks: RockGrid) -> RockGrid:
    return rocks
-rocks = slide_rocks_top([[c for c in r] for r in rocks0])
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        rocks0 = [list(line) for line in input.splitlines()]
-# part 1
+        rocks = slide_rocks_top([[c for c in r] for r in rocks0])
 answer_1 = sum(
    (len(rocks) - i) * sum(1 for c in row if c == "O") for i, row in enumerate(rocks)
 )
 print(f"answer 1 is {answer_1}")
-# part 2
+        # part 1
-rocks = rocks0
+        yield sum(
            (len(rocks) - i) * sum(1 for c in row if c == "O")
            for i, row in enumerate(rocks)
        )
-N = 1000000000
+        # part 2
-cycles: list[RockGrid] = []
+        rocks = rocks0
 i_cycle: int = -1
 for i_cycle in range(N):
    rocks = cycle(rocks)
-    if any(rocks == c for c in cycles):
+        N = 1000000000
-        break
+        cycles: list[RockGrid] = []
        i_cycle: int = -1
        for i_cycle in range(N):
            rocks = cycle(rocks)
-    cycles.append([[c for c in r] for r in rocks])
+            if any(rocks == c for c in cycles):
                break
-cycle_start = next(i for i in range(len(cycles)) if (rocks == cycles[i]))
+            cycles.append([[c for c in r] for r in rocks])
 cycle_length = i_cycle - cycle_start
-ci = cycle_start + (N - cycle_start) % cycle_length - 1
+        cycle_start = next(i for i in range(len(cycles)) if (rocks == cycles[i]))
        cycle_length = i_cycle - cycle_start
-answer_2 = sum(
+        ci = cycle_start + (N - cycle_start) % cycle_length - 1
-    (len(rocks) - i) * sum(1 for c in row if c == "O")
+
-    for i, row in enumerate(cycles[ci])
+        yield sum(
-)
+            (len(rocks) - i) * sum(1 for c in row if c == "O")
-print(f"answer 2 is {answer_2}")
+            for i, row in enumerate(cycles[ci])
        )
--- a/src/holt59/aoc/2023/day15.py
+++ b/src/holt59/aoc/2023/day15.py
@ -1,31 +1,33 @@
 import sys
 from functools import reduce
 from typing import Any, Iterator
-steps = sys.stdin.read().strip().split(",")
+from ..base import BaseSolver
 def _hash(s: str) -> int:
    return reduce(lambda v, u: ((v + ord(u)) * 17) % 256, s, 0)
-# part 1
+class Solver(BaseSolver):
-answer_1 = sum(map(_hash, steps))
+    def solve(self, input: str) -> Iterator[Any]:
-print(f"answer 1 is {answer_1}")
+        steps = input.split(",")
-# part 2
+        # part 1
-boxes: list[dict[str, int]] = [{} for _ in range(256)]
+        yield sum(map(_hash, steps))
-for step in steps:
+        # part 2
-    if (i := step.find("=")) >= 0:
+        boxes: list[dict[str, int]] = [{} for _ in range(256)]
        label, length = step[:i], int(step[i + 1 :])
        boxes[_hash(label)][label] = length
    else:
        label = step[:-1]
        boxes[_hash(label)].pop(label, None)
-answer_2 = sum(
+        for step in steps:
-    i_box * i_lens * length
+            if (i := step.find("=")) >= 0:
-    for i_box, box in enumerate(boxes, start=1)
+                label, length = step[:i], int(step[i + 1 :])
-    for i_lens, length in enumerate(box.values(), start=1)
+                boxes[_hash(label)][label] = length
-)
+            else:
-print(f"answer 2 is {answer_2}")
+                label = step[:-1]
                boxes[_hash(label)].pop(label, None)
        yield sum(
            i_box * i_lens * length
            for i_box, box in enumerate(boxes, start=1)
            for i_lens, length in enumerate(box.values(), start=1)
        )
--- a/src/holt59/aoc/2023/day16.py
+++ b/src/holt59/aoc/2023/day16.py
@ -1,8 +1,6 @@
-import os
+from typing import Any, Iterator, Literal, TypeAlias, cast
 import sys
 from typing import Literal, TypeAlias, cast
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 CellType: TypeAlias = Literal[".", "|", "-", "\\", "/"]
 Direction: TypeAlias = Literal["R", "L", "U", "D"]
@ -78,33 +76,38 @@ def propagate(
    return beams
-layout: list[list[CellType]] = [
+class Solver(BaseSolver):
-    [cast(CellType, col) for col in row] for row in sys.stdin.read().splitlines()
+    def solve(self, input: str) -> Iterator[Any]:
-]
+        layout: list[list[CellType]] = [
            [cast(CellType, col) for col in row] for row in input.splitlines()
        ]
        beams = propagate(layout, (0, 0), "R")
-beams = propagate(layout, (0, 0), "R")
+        if self.files:
            self.files.create(
                "beams.txt",
                "\n".join(
                    "".join("#" if col else "." for col in row) for row in beams
                ).encode(),
                True,
            )
-if VERBOSE:
+        # part 1
-    print("\n".join(["".join("#" if col else "." for col in row) for row in beams]))
+        yield sum(sum(map(bool, row)) for row in beams)
-# part 1
+        # part 2
-answer_1 = sum(sum(map(bool, row)) for row in beams)
+        n_rows, n_cols = len(layout), len(layout[0])
-print(f"answer 1 is {answer_1}")
+        cases: list[tuple[tuple[int, int], Direction]] = []
-# part 2
+        for row in range(n_rows):
-n_rows, n_cols = len(layout), len(layout[0])
+            cases.append(((row, 0), "R"))
-cases: list[tuple[tuple[int, int], Direction]] = []
+            cases.append(((row, n_cols - 1), "L"))
        for col in range(n_cols):
            cases.append(((0, col), "D"))
            cases.append(((n_rows - 1, col), "U"))
-for row in range(n_rows):
+        yield max(
-    cases.append(((row, 0), "R"))
+            sum(sum(map(bool, row)) for row in propagate(layout, start, direction))
-    cases.append(((row, n_cols - 1), "L"))
+            for start, direction in cases
-for col in range(n_cols):
+        )
    cases.append(((0, col), "D"))
    cases.append(((n_rows - 1, col), "U"))
 answer_2 = max(
    sum(sum(map(bool, row)) for row in propagate(layout, start, direction))
    for start, direction in cases
 )
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day17.py
+++ b/src/holt59/aoc/2023/day17.py
@ -1,13 +1,11 @@
 from __future__ import annotations
 import heapq
 import os
 import sys
 from collections import defaultdict
 from dataclasses import dataclass
-from typing import Literal, TypeAlias
+from typing import Any, Iterator, Literal, TypeAlias
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 Direction: TypeAlias = Literal[">", "<", "^", "v"]
@ -32,202 +30,209 @@ MAPPINGS: dict[Direction, tuple[int, int, Direction]] = {
 }
-def print_shortest_path(
+class Solver(BaseSolver):
-    grid: list[list[int]],
+    def print_shortest_path(
-    target: tuple[int, int],
+        self,
-    per_cell: dict[tuple[int, int], list[tuple[Label, int]]],
+        name: str,
-):
+        grid: list[list[int]],
-    assert len(per_cell[target]) == 1
+        target: tuple[int, int],
-    label = per_cell[target][0][0]
+        per_cell: dict[tuple[int, int], list[tuple[Label, int]]],
    ):
        if not self.files:
            return
-    path: list[Label] = []
+        assert len(per_cell[target]) == 1
-    while True:
+        label = per_cell[target][0][0]
        path.insert(0, label)
        if label.parent is None:
            break
        label = label.parent
-    p_grid = [[str(c) for c in r] for r in grid]
+        path: list[Label] = []
        while True:
            path.insert(0, label)
            if label.parent is None:
                break
            label = label.parent
-    for i in range(len(grid)):
+        p_grid = [[str(c) for c in r] for r in grid]
        for j in range(len(grid[0])):
            if per_cell[i, j]:
                p_grid[i][j] = f"\033[94m{grid[i][j]}\033[0m"
-    prev_label = path[0]
+        for i in range(len(grid)):
-    for label in path[1:]:
+            for j in range(len(grid[0])):
-        for r in range(
+                if per_cell[i, j]:
-            min(prev_label.row, label.row), max(prev_label.row, label.row) + 1
+                    p_grid[i][j] = f"\033[94m{grid[i][j]}\033[0m"
-        ):
+
-            for c in range(
+        prev_label = path[0]
-                min(prev_label.col, label.col),
+        for label in path[1:]:
-                max(prev_label.col, label.col) + 1,
+            for r in range(
                min(prev_label.row, label.row), max(prev_label.row, label.row) + 1
            ):
-                if (r, c) != (prev_label.row, prev_label.col):
+                for c in range(
-                    p_grid[r][c] = f"\033[93m{grid[r][c]}\033[0m"
+                    min(prev_label.col, label.col),
                    max(prev_label.col, label.col) + 1,
                ):
                    if (r, c) != (prev_label.row, prev_label.col):
                        p_grid[r][c] = f"\033[93m{grid[r][c]}\033[0m"
-        p_grid[label.row][label.col] = f"\033[91m{grid[label.row][label.col]}\033[0m"
+            p_grid[label.row][label.col] = (
                f"\033[91m{grid[label.row][label.col]}\033[0m"
            )
-        prev_label = label
+            prev_label = label
-    p_grid[0][0] = f"\033[92m{grid[0][0]}\033[0m"
+        p_grid[0][0] = f"\033[92m{grid[0][0]}\033[0m"
-    print("\n".join("".join(row) for row in p_grid))
+        self.files.create(
            name, "\n".join("".join(row) for row in p_grid).encode(), True
        )
    def shortest_many_paths(self, grid: list[list[int]]) -> dict[tuple[int, int], int]:
        n_rows, n_cols = len(grid), len(grid[0])
-def shortest_many_paths(grid: list[list[int]]) -> dict[tuple[int, int], int]:
+        visited: dict[tuple[int, int], tuple[Label, int]] = {}
    n_rows, n_cols = len(grid), len(grid[0])
-    visited: dict[tuple[int, int], tuple[Label, int]] = {}
+        queue: list[tuple[int, Label]] = [
            (0, Label(row=n_rows - 1, col=n_cols - 1, direction="^", count=0))
        ]
-    queue: list[tuple[int, Label]] = [
+        while queue and len(visited) != n_rows * n_cols:
-        (0, Label(row=n_rows - 1, col=n_cols - 1, direction="^", count=0))
+            distance, label = heapq.heappop(queue)
    ]
-    while queue and len(visited) != n_rows * n_cols:
+            if (label.row, label.col) in visited:
        distance, label = heapq.heappop(queue)
        if (label.row, label.col) in visited:
            continue
        visited[label.row, label.col] = (label, distance)
        for direction, (c_row, c_col, i_direction) in MAPPINGS.items():
            if label.direction == i_direction:
                continue
            else:
                row, col = (label.row + c_row, label.col + c_col)
            # exclude labels outside the grid or with too many moves in the same
            # direction
            if row not in range(0, n_rows) or col not in range(0, n_cols):
                continue
-            heapq.heappush(
+            visited[label.row, label.col] = (label, distance)
-                queue,
+
-                (
+            for direction, (c_row, c_col, i_direction) in MAPPINGS.items():
                if label.direction == i_direction:
                    continue
                else:
                    row, col = (label.row + c_row, label.col + c_col)
                # exclude labels outside the grid or with too many moves in the same
                # direction
                if row not in range(0, n_rows) or col not in range(0, n_cols):
                    continue
                heapq.heappush(
                    queue,
                    (
                        distance
                        + sum(
                            grid[r][c]
                            for r in range(min(row, label.row), max(row, label.row) + 1)
                            for c in range(min(col, label.col), max(col, label.col) + 1)
                        )
                        - grid[row][col],
                        Label(
                            row=row,
                            col=col,
                            direction=direction,
                            count=0,
                            parent=label,
                        ),
                    ),
                )
        return {(r, c): visited[r, c][1] for r in range(n_rows) for c in range(n_cols)}
    def shortest_path(
        self,
        name: str,
        grid: list[list[int]],
        min_straight: int,
        max_straight: int,
        lower_bounds: dict[tuple[int, int], int],
    ) -> int:
        n_rows, n_cols = len(grid), len(grid[0])
        target = (len(grid) - 1, len(grid[0]) - 1)
        # for each tuple (row, col, direction, count), the associated label when visited
        visited: dict[tuple[int, int, str, int], Label] = {}
        # list of all visited labels for a cell (with associated distance)
        per_cell: dict[tuple[int, int], list[tuple[Label, int]]] = defaultdict(list)
        # need to add two start labels, otherwise one of the two possible direction will
        # not be possible
        queue: list[tuple[int, int, Label]] = [
            (lower_bounds[0, 0], 0, Label(row=0, col=0, direction="^", count=0)),
            (lower_bounds[0, 0], 0, Label(row=0, col=0, direction="<", count=0)),
        ]
        while queue:
            _, distance, label = heapq.heappop(queue)
            if (label.row, label.col, label.direction, label.count) in visited:
                continue
            visited[label.row, label.col, label.direction, label.count] = label
            per_cell[label.row, label.col].append((label, distance))
            if (label.row, label.col) == target:
                break
            for direction, (c_row, c_col, i_direction) in MAPPINGS.items():
                # cannot move in the opposite direction
                if label.direction == i_direction:
                    continue
                # other direction, move 'min_straight' in the new direction
                elif label.direction != direction:
                    row, col, count = (
                        label.row + min_straight * c_row,
                        label.col + min_straight * c_col,
                        min_straight,
                    )
                # same direction, too many count
                elif label.count == max_straight:
                    continue
                # same direction, keep going and increment count
                else:
                    row, col, count = (
                        label.row + c_row,
                        label.col + c_col,
                        label.count + 1,
                    )
                # exclude labels outside the grid or with too many moves in the same
                # direction
                if row not in range(0, n_rows) or col not in range(0, n_cols):
                    continue
                distance_to = (
                    distance
                    + sum(
                        grid[r][c]
                        for r in range(min(row, label.row), max(row, label.row) + 1)
                        for c in range(min(col, label.col), max(col, label.col) + 1)
                    )
-                    - grid[row][col],
+                    - grid[label.row][label.col]
-                    Label(
+                )
-                        row=row,
+
-                        col=col,
+                heapq.heappush(
-                        direction=direction,
+                    queue,
-                        count=0,
+                    (
-                        parent=label,
+                        distance_to + lower_bounds[row, col],
                        distance_to,
                        Label(
                            row=row,
                            col=col,
                            direction=direction,
                            count=count,
                            parent=label,
                        ),
                    ),
                ),
            )
    return {(r, c): visited[r, c][1] for r in range(n_rows) for c in range(n_cols)}
 def shortest_path(
    grid: list[list[int]],
    min_straight: int,
    max_straight: int,
    lower_bounds: dict[tuple[int, int], int],
 ) -> int:
    n_rows, n_cols = len(grid), len(grid[0])
    target = (len(grid) - 1, len(grid[0]) - 1)
    # for each tuple (row, col, direction, count), the associated label when visited
    visited: dict[tuple[int, int, str, int], Label] = {}
    # list of all visited labels for a cell (with associated distance)
    per_cell: dict[tuple[int, int], list[tuple[Label, int]]] = defaultdict(list)
    # need to add two start labels, otherwise one of the two possible direction will
    # not be possible
    queue: list[tuple[int, int, Label]] = [
        (lower_bounds[0, 0], 0, Label(row=0, col=0, direction="^", count=0)),
        (lower_bounds[0, 0], 0, Label(row=0, col=0, direction="<", count=0)),
    ]
    while queue:
        _, distance, label = heapq.heappop(queue)
        if (label.row, label.col, label.direction, label.count) in visited:
            continue
        visited[label.row, label.col, label.direction, label.count] = label
        per_cell[label.row, label.col].append((label, distance))
        if (label.row, label.col) == target:
            break
        for direction, (c_row, c_col, i_direction) in MAPPINGS.items():
            # cannot move in the opposite direction
            if label.direction == i_direction:
                continue
            # other direction, move 'min_straight' in the new direction
            elif label.direction != direction:
                row, col, count = (
                    label.row + min_straight * c_row,
                    label.col + min_straight * c_col,
                    min_straight,
                )
-            # same direction, too many count
+        self.print_shortest_path(f"shortest-path_{name}.txt", grid, target, per_cell)
            elif label.count == max_straight:
                continue
-            # same direction, keep going and increment count
+        return per_cell[target][0][1]
            else:
                row, col, count = (
                    label.row + c_row,
                    label.col + c_col,
                    label.count + 1,
                )
            # exclude labels outside the grid or with too many moves in the same
            # direction
            if row not in range(0, n_rows) or col not in range(0, n_cols):
                continue
-            distance_to = (
+    def solve(self, input: str) -> Iterator[Any]:
-                distance
+        data = [[int(c) for c in r] for r in input.splitlines()]
-                + sum(
+        estimates = self.shortest_many_paths(data)
                    grid[r][c]
                    for r in range(min(row, label.row), max(row, label.row) + 1)
                    for c in range(min(col, label.col), max(col, label.col) + 1)
                )
                - grid[label.row][label.col]
            )
-            heapq.heappush(
+        # part 1
-                queue,
+        yield self.shortest_path("answer_1", data, 1, 3, lower_bounds=estimates)
                (
                    distance_to + lower_bounds[row, col],
                    distance_to,
                    Label(
                        row=row,
                        col=col,
                        direction=direction,
                        count=count,
                        parent=label,
                    ),
                ),
            )
-    if VERBOSE:
+        # part 2
-        print_shortest_path(grid, target, per_cell)
+        yield self.shortest_path("answer_2", data, 4, 10, lower_bounds=estimates)
    return per_cell[target][0][1]
 data = [[int(c) for c in r] for r in sys.stdin.read().splitlines()]
 estimates = shortest_many_paths(data)
 # part 1
 answer_1 = shortest_path(data, 1, 3, lower_bounds=estimates)
 print(f"answer 1 is {answer_1}")
 # part 2
 answer_2 = shortest_path(data, 4, 10, lower_bounds=estimates)
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day18.py
+++ b/src/holt59/aoc/2023/day18.py
@ -1,5 +1,6 @@
-import sys
+from typing import Any, Iterator, Literal, TypeAlias, cast
-from typing import Literal, TypeAlias, cast
+
 from ..base import BaseSolver
 Direction: TypeAlias = Literal["R", "L", "U", "D"]
@ -33,22 +34,23 @@ def polygon(values: list[tuple[Direction, int]]) -> tuple[list[tuple[int, int]],
    return corners, perimeter
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
        # part 1
        yield area(
            *polygon(
                [(cast(Direction, (p := line.split())[0]), int(p[1])) for line in lines]
            )
        )
-# part 1
+        # part 2
-answer_1 = area(
+        yield area(
-    *polygon([(cast(Direction, (p := line.split())[0]), int(p[1])) for line in lines])
+            *polygon(
-)
+                [
-print(f"answer 1 is {answer_1}")
+                    (DIRECTIONS[int((h := line.split()[-1])[-2])], int(h[2:-2], 16))
-
+                    for line in lines
-# part 2
+                ]
-answer_2 = area(
+            )
-    *polygon(
+        )
        [
            (DIRECTIONS[int((h := line.split()[-1])[-2])], int(h[2:-2], 16))
            for line in lines
        ]
    )
 )
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day19.py
+++ b/src/holt59/aoc/2023/day19.py
@ -1,13 +1,8 @@
 import logging
 import operator
 import os
 import sys
 from math import prod
-from typing import Literal, TypeAlias, cast
+from typing import Any, Iterator, Literal, TypeAlias, cast
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)
 Category: TypeAlias = Literal["x", "m", "a", "s"]
 Part: TypeAlias = dict[Category, int]
@ -22,119 +17,118 @@ Check: TypeAlias = tuple[Category, Literal["<", ">"], int] | None
 Workflow: TypeAlias = list[tuple[Check, str]]
-def accept(workflows: dict[str, Workflow], part: Part) -> bool:
+class Solver(BaseSolver):
-    workflow = "in"
+    def accept(self, workflows: dict[str, Workflow], part: Part) -> bool:
-    decision: bool | None = None
+        workflow = "in"
        decision: bool | None = None
-    while decision is None:
+        while decision is None:
-        for check, target in workflows[workflow]:
+            for check, target in workflows[workflow]:
-            passed = check is None
+                passed = check is None
-            if check is not None:
+                if check is not None:
-                category, sense, value = check
+                    category, sense, value = check
-                passed = OPERATORS[sense](part[category], value)
+                    passed = OPERATORS[sense](part[category], value)
-            if passed:
+                if passed:
-                if target in workflows:
+                    if target in workflows:
-                    workflow = target
+                        workflow = target
-                else:
+                    else:
-                    decision = target == "A"
+                        decision = target == "A"
-                break
+                    break
-    return decision
+        return decision
    def propagate(self, workflows: dict[str, Workflow], start: PartWithBounds) -> int:
        def _fmt(meta: PartWithBounds) -> str:
            return "{" + ", ".join(f"{k}={v}" for k, v in meta.items()) + "}"
-def propagate(workflows: dict[str, Workflow], start: PartWithBounds) -> int:
+        def transfer_or_accept(
-    def _fmt(meta: PartWithBounds) -> str:
+            target: str, meta: PartWithBounds, queue: list[tuple[PartWithBounds, str]]
-        return "{" + ", ".join(f"{k}={v}" for k, v in meta.items()) + "}"
+        ) -> int:
-
+            count = 0
-    def transfer_or_accept(
+            if target in workflows:
-        target: str, meta: PartWithBounds, queue: list[tuple[PartWithBounds, str]]
+                self.logger.info(f"    transfer to {target}")
-    ) -> int:
+                queue.append((meta, target))
-        count = 0
+            elif target == "A":
-        if target in workflows:
+                count = prod((high - low + 1) for low, high in meta.values())
-            logging.info(f"    transfer to {target}")
+                self.logger.info(f"    accepted ({count})")
            queue.append((meta, target))
        elif target == "A":
            count = prod((high - low + 1) for low, high in meta.values())
            logging.info(f"    accepted ({count})")
        else:
            logging.info("    rejected")
        return count
    accepted = 0
    queue: list[tuple[PartWithBounds, str]] = [(start, "in")]
    n_iterations = 0
    while queue:
        n_iterations += 1
        meta, workflow = queue.pop()
        logging.info(f"{workflow}: {_fmt(meta)}")
        for check, target in workflows[workflow]:
            if check is None:
                logging.info("  end-of-workflow")
                accepted += transfer_or_accept(target, meta, queue)
                continue
            category, sense, value = check
            bounds, op = meta[category], OPERATORS[sense]
            logging.info(f"  checking {_fmt(meta)} against {category} {sense} {value}")
            if not op(bounds[0], value) and not op(bounds[1], value):
                logging.info("    reject, always false")
                continue
            if op(meta[category][0], value) and op(meta[category][1], value):
                logging.info("    accept, always true")
                accepted += transfer_or_accept(target, meta, queue)
                break
            meta2 = meta.copy()
            low, high = meta[category]
            if sense == "<":
                meta[category], meta2[category] = (value, high), (low, value - 1)
            else:
-                meta[category], meta2[category] = (low, value), (value + 1, high)
+                self.logger.info("    rejected")
-            logging.info(f"    split {_fmt(meta2)} ({target}), {_fmt(meta)}")
+            return count
-            accepted += transfer_or_accept(target, meta2, queue)
+        accepted = 0
        queue: list[tuple[PartWithBounds, str]] = [(start, "in")]
-    logging.info(f"run took {n_iterations} iterations")
+        n_iterations = 0
    return accepted
        while queue:
            n_iterations += 1
            meta, workflow = queue.pop()
            self.logger.info(f"{workflow}: {_fmt(meta)}")
            for check, target in workflows[workflow]:
                if check is None:
                    self.logger.info("  end-of-workflow")
                    accepted += transfer_or_accept(target, meta, queue)
                    continue
-workflows_s, parts_s = sys.stdin.read().strip().split("\n\n")
+                category, sense, value = check
                bounds, op = meta[category], OPERATORS[sense]
-workflows: dict[str, Workflow] = {}
+                self.logger.info(
-for workflow_s in workflows_s.split("\n"):
+                    f"  checking {_fmt(meta)} against {category} {sense} {value}"
-    name, block_s = workflow_s.split("{")
+                )
    workflows[name] = []
-    for block in block_s[:-1].split(","):
+                if not op(bounds[0], value) and not op(bounds[1], value):
-        check: Check
+                    self.logger.info("    reject, always false")
-        if (i := block.find(":")) >= 0:
+                    continue
            check = (
                cast(Category, block[0]),
                cast(Literal["<", ">"], block[1]),
                int(block[2:i]),
            )
            target = block[i + 1 :]
        else:
            check, target = None, block
        workflows[name].append((check, target))
-# part 1
+                if op(meta[category][0], value) and op(meta[category][1], value):
-parts: list[Part] = [
+                    self.logger.info("    accept, always true")
-    {cast(Category, s[0]): int(s[2:]) for s in part_s[1:-1].split(",")}
+                    accepted += transfer_or_accept(target, meta, queue)
-    for part_s in parts_s.split("\n")
+                    break
 ]
 answer_1 = sum(sum(part.values()) for part in parts if accept(workflows, part))
 print(f"answer 1 is {answer_1}")
                meta2 = meta.copy()
                low, high = meta[category]
                if sense == "<":
                    meta[category], meta2[category] = (value, high), (low, value - 1)
                else:
                    meta[category], meta2[category] = (low, value), (value + 1, high)
                self.logger.info(f"    split {_fmt(meta2)} ({target}), {_fmt(meta)}")
-# part 2
+                accepted += transfer_or_accept(target, meta2, queue)
-answer_2 = propagate(
+
-    workflows, {cast(Category, c): (1, 4000) for c in ["x", "m", "a", "s"]}
+        self.logger.info(f"run took {n_iterations} iterations")
-)
+        return accepted
-print(f"answer 2 is {answer_2}")
+
    def solve(self, input: str) -> Iterator[Any]:
        workflows_s, parts_s = input.split("\n\n")
        workflows: dict[str, Workflow] = {}
        for workflow_s in workflows_s.split("\n"):
            name, block_s = workflow_s.split("{")
            workflows[name] = []
            for block in block_s[:-1].split(","):
                check: Check
                if (i := block.find(":")) >= 0:
                    check = (
                        cast(Category, block[0]),
                        cast(Literal["<", ">"], block[1]),
                        int(block[2:i]),
                    )
                    target = block[i + 1 :]
                else:
                    check, target = None, block
                workflows[name].append((check, target))
        # part 1
        parts: list[Part] = [
            {cast(Category, s[0]): int(s[2:]) for s in part_s[1:-1].split(",")}
            for part_s in parts_s.split("\n")
        ]
        yield sum(sum(part.values()) for part in parts if self.accept(workflows, part))
        # part 2
        yield self.propagate(
            workflows, {cast(Category, c): (1, 4000) for c in ["x", "m", "a", "s"]}
        )
--- a/src/holt59/aoc/2023/day2.py
+++ b/src/holt59/aoc/2023/day2.py
@ -1,43 +1,43 @@
 import math
-import sys
+from typing import Any, Iterator, Literal, TypeAlias, cast
-from typing import Literal, TypeAlias, cast
+
 from ..base import BaseSolver
 CubeType: TypeAlias = Literal["red", "blue", "green"]
 MAX_CUBES: dict[CubeType, int] = {"red": 12, "green": 13, "blue": 14}
 # parse games
 lines = sys.stdin.read().splitlines()
 games: dict[int, list[dict[CubeType, int]]] = {}
 for line in filter(bool, lines):
    id_part, sets_part = line.split(":")
-    games[int(id_part.split(" ")[-1])] = [
+class Solver(BaseSolver):
-        {
+    def solve(self, input: str) -> Iterator[Any]:
-            cast(CubeType, s[1]): int(s[0])
+        lines = input.splitlines()
-            for cube_draw in cube_set_s.strip().split(", ")
+        games: dict[int, list[dict[CubeType, int]]] = {}
-            if (s := cube_draw.split(" "))
+        for line in filter(bool, lines):
-        }
+            id_part, sets_part = line.split(":")
        for cube_set_s in sets_part.strip().split(";")
    ]
-# part 1
+            games[int(id_part.split(" ")[-1])] = [
-answer_1 = sum(
+                {
-    id
+                    cast(CubeType, s[1]): int(s[0])
-    for id, set_of_cubes in games.items()
+                    for cube_draw in cube_set_s.strip().split(", ")
-    if all(
+                    if (s := cube_draw.split(" "))
-        n_cubes <= MAX_CUBES[cube]
+                }
-        for cube_set in set_of_cubes
+                for cube_set_s in sets_part.strip().split(";")
-        for cube, n_cubes in cube_set.items()
+            ]
    )
 )
 print(f"answer 1 is {answer_1}")
-# part 2
+        yield sum(
-answer_2 = sum(
+            id
-    math.prod(
+            for id, set_of_cubes in games.items()
-        max(cube_set.get(cube, 0) for cube_set in set_of_cubes) for cube in MAX_CUBES
+            if all(
-    )
+                n_cubes <= MAX_CUBES[cube]
-    for set_of_cubes in games.values()
+                for cube_set in set_of_cubes
-)
+                for cube, n_cubes in cube_set.items()
-print(f"answer 2 is {answer_2}")
+            )
        )
        yield sum(
            math.prod(
                max(cube_set.get(cube, 0) for cube_set in set_of_cubes)
                for cube in MAX_CUBES
            )
            for set_of_cubes in games.values()
        )
--- a/src/holt59/aoc/2023/day20.py
+++ b/src/holt59/aoc/2023/day20.py
@ -1,161 +1,172 @@
 import logging
 import os
 import sys
 from collections import defaultdict
 from math import lcm
-from typing import Literal, TypeAlias
+from typing import Any, Iterator, Literal, TypeAlias
 VERBOSE = os.getenv("AOC_VERBOSE") == "True"
 logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)
 from ..base import BaseSolver
 ModuleType: TypeAlias = Literal["broadcaster", "conjunction", "flip-flop"]
 PulseType: TypeAlias = Literal["high", "low"]
 modules: dict[str, tuple[ModuleType, list[str]]] = {}
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    _modules: dict[str, tuple[ModuleType, list[str]]]
-for line in lines:
+    def _process(
-    name, outputs_s = line.split(" -> ")
+        self,
-    outputs = outputs_s.split(", ")
+        start: tuple[str, str, PulseType],
-    if name == "broadcaster":
+        flip_flop_states: dict[str, Literal["on", "off"]],
-        modules["broadcaster"] = ("broadcaster", outputs)
+        conjunction_states: dict[str, dict[str, PulseType]],
-    else:
+    ) -> tuple[dict[PulseType, int], dict[str, dict[PulseType, int]]]:
-        modules[name[1:]] = (
+        pulses: list[tuple[str, str, PulseType]] = [start]
-            "conjunction" if name.startswith("&") else "flip-flop",
+        counts: dict[PulseType, int] = {"low": 0, "high": 0}
-            outputs,
+        inputs: dict[str, dict[PulseType, int]] = defaultdict(
            lambda: {"low": 0, "high": 0}
        )
        self.logger.info("starting process... ")
-def process(
+        while pulses:
-    start: tuple[str, str, PulseType],
+            input, name, pulse = pulses.pop(0)
-    flip_flop_states: dict[str, Literal["on", "off"]],
+            self.logger.info(f"{input} -{pulse}-> {name}")
-    conjunction_states: dict[str, dict[str, PulseType]],
+            counts[pulse] += 1
 ) -> tuple[dict[PulseType, int], dict[str, dict[PulseType, int]]]:
    pulses: list[tuple[str, str, PulseType]] = [start]
    counts: dict[PulseType, int] = {"low": 0, "high": 0}
    inputs: dict[str, dict[PulseType, int]] = defaultdict(lambda: {"low": 0, "high": 0})
-    logging.info("starting process... ")
+            inputs[name][pulse] += 1
-    while pulses:
+            if name not in self._modules:
        input, name, pulse = pulses.pop(0)
        logging.info(f"{input} -{pulse}-> {name}")
        counts[pulse] += 1
        inputs[name][pulse] += 1
        if name not in modules:
            continue
        type, outputs = modules[name]
        if type == "broadcaster":
            ...
        elif type == "flip-flop":
            if pulse == "high":
                continue
-            if flip_flop_states[name] == "off":
+            type, outputs = self._modules[name]
-                flip_flop_states[name] = "on"
+
-                pulse = "high"
+            if type == "broadcaster":
                ...
            elif type == "flip-flop":
                if pulse == "high":
                    continue
                if flip_flop_states[name] == "off":
                    flip_flop_states[name] = "on"
                    pulse = "high"
                else:
                    flip_flop_states[name] = "off"
                    pulse = "low"
            else:
-                flip_flop_states[name] = "off"
+                conjunction_states[name][input] = pulse
                pulse = "low"
-        else:
+                if all(state == "high" for state in conjunction_states[name].values()):
-            conjunction_states[name][input] = pulse
+                    pulse = "low"
                else:
                    pulse = "high"
-            if all(state == "high" for state in conjunction_states[name].values()):
+            pulses.extend((name, output, pulse) for output in outputs)
-                pulse = "low"
+
        return counts, inputs
    def solve(self, input: str) -> Iterator[Any]:
        self._modules = {}
        lines = input.splitlines()
        for line in lines:
            name, outputs_s = line.split(" -> ")
            outputs = outputs_s.split(", ")
            if name == "broadcaster":
                self._modules["broadcaster"] = ("broadcaster", outputs)
            else:
-                pulse = "high"
+                self._modules[name[1:]] = (
                    "conjunction" if name.startswith("&") else "flip-flop",
                    outputs,
                )
-        pulses.extend((name, output, pulse) for output in outputs)
+        if self.files:
            contents = "digraph G {\n"
            contents += "rx [shape=circle, color=red, style=filled];\n"
            for name, (type, outputs) in self._modules.items():
                if type == "conjunction":
                    shape = "diamond"
                elif type == "flip-flop":
                    shape = "box"
                else:
                    shape = "circle"
                contents += f"{name} [shape={shape}];\n"
            for name, (type, outputs) in self._modules.items():
                for output in outputs:
                    contents += f"{name} -> {output};\n"
            contents += "}\n"
-    return counts, inputs
+            self.files.create("day20.dot", contents.encode(), False)
        # part 1
        flip_flop_states: dict[str, Literal["on", "off"]] = {
            name: "off"
            for name, (type, _) in self._modules.items()
            if type == "flip-flop"
        }
        conjunction_states: dict[str, dict[str, PulseType]] = {
            name: {
                input: "low"
                for input, (_, outputs) in self._modules.items()
                if name in outputs
            }
            for name, (type, _) in self._modules.items()
            if type == "conjunction"
        }
        counts: dict[PulseType, int] = {"low": 0, "high": 0}
        for _ in range(1000):
            result, _ = self._process(
                ("button", "broadcaster", "low"), flip_flop_states, conjunction_states
            )
            for pulse in ("low", "high"):
                counts[pulse] += result[pulse]
        yield counts["low"] * counts["high"]
-with open("./day20.dot", "w") as fp:
+        # part 2
    fp.write("digraph G {\n")
    fp.write("rx [shape=circle, color=red, style=filled];\n")
    for name, (type, outputs) in modules.items():
        if type == "conjunction":
            shape = "diamond"
        elif type == "flip-flop":
            shape = "box"
        else:
            shape = "circle"
        fp.write(f"{name} [shape={shape}];\n")
    for name, (type, outputs) in modules.items():
        for output in outputs:
            fp.write(f"{name} -> {output};\n")
    fp.write("}\n")
-# part 1
+        # reset states
-flip_flop_states: dict[str, Literal["on", "off"]] = {
+        for name in flip_flop_states:
-    name: "off" for name, (type, _) in modules.items() if type == "flip-flop"
+            flip_flop_states[name] = "off"
 }
 conjunction_states: dict[str, dict[str, PulseType]] = {
    name: {input: "low" for input, (_, outputs) in modules.items() if name in outputs}
    for name, (type, _) in modules.items()
    if type == "conjunction"
 }
 counts: dict[PulseType, int] = {"low": 0, "high": 0}
 for _ in range(1000):
    result, _ = process(
        ("button", "broadcaster", "low"), flip_flop_states, conjunction_states
    )
    for pulse in ("low", "high"):
        counts[pulse] += result[pulse]
 answer_1 = counts["low"] * counts["high"]
 print(f"answer 1 is {answer_1}")
-# part 2
+        for name in conjunction_states:
            for input in conjunction_states[name]:
                conjunction_states[name][input] = "low"
-# reset states
+        # find the conjunction connected to rx
-for name in flip_flop_states:
+        to_rx = [
-    flip_flop_states[name] = "off"
+            name for name, (_, outputs) in self._modules.items() if "rx" in outputs
        ]
        assert len(to_rx) == 1, "cannot handle multiple module inputs for rx"
        assert (
            self._modules[to_rx[0]][0] == "conjunction"
        ), "can only handle conjunction as input to rx"
-for name in conjunction_states:
+        to_rx_inputs = [
-    for input in conjunction_states[name]:
+            name for name, (_, outputs) in self._modules.items() if to_rx[0] in outputs
-        conjunction_states[name][input] = "low"
+        ]
        assert all(
            self._modules[i][0] == "conjunction" and len(self._modules[i][1]) == 1
            for i in to_rx_inputs
        ), "can only handle inversion as second-order inputs to rx"
-# find the conjunction connected to rx
+        count = 1
-to_rx = [name for name, (_, outputs) in modules.items() if "rx" in outputs]
+        cycles: dict[str, int] = {}
-assert len(to_rx) == 1, "cannot handle multiple module inputs for rx"
+        second: dict[str, int] = {}
-assert (
+        while len(second) != len(to_rx_inputs):
-    modules[to_rx[0]][0] == "conjunction"
+            _, inputs = self._process(
-), "can only handle conjunction as input to rx"
+                ("button", "broadcaster", "low"), flip_flop_states, conjunction_states
            )
-to_rx_inputs = [name for name, (_, outputs) in modules.items() if to_rx[0] in outputs]
+            for node in to_rx_inputs:
-assert all(
+                if inputs[node]["low"] == 1:
-    modules[i][0] == "conjunction" and len(modules[i][1]) == 1 for i in to_rx_inputs
+                    if node not in cycles:
-), "can only handle inversion as second-order inputs to rx"
+                        cycles[node] = count
                    elif node not in second:
                        second[node] = count
            count += 1
-count = 1
+        assert all(
-cycles: dict[str, int] = {}
+            second[k] == cycles[k] * 2 for k in to_rx_inputs
-second: dict[str, int] = {}
+        ), "cannot only handle cycles starting at the beginning"
 while len(second) != len(to_rx_inputs):
    _, inputs = process(
        ("button", "broadcaster", "low"), flip_flop_states, conjunction_states
    )
-    for node in to_rx_inputs:
+        yield lcm(*cycles.values())
        if inputs[node]["low"] == 1:
            if node not in cycles:
                cycles[node] = count
            elif node not in second:
                second[node] = count
    count += 1
 assert all(
    second[k] == cycles[k] * 2 for k in to_rx_inputs
 ), "cannot only handle cycles starting at the beginning"
 answer_2 = lcm(*cycles.values())
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day21.py
+++ b/src/holt59/aoc/2023/day21.py
@ -1,9 +1,6 @@
-import logging
+from typing import Any, Iterator
 import os
 import sys
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)
 def reachable(
@ -21,129 +18,133 @@ def reachable(
    return tiles
-map = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
-start = next(
+    def solve(self, input: str) -> Iterator[Any]:
-    (i, j) for i in range(len(map)) for j in range(len(map[i])) if map[i][j] == "S"
+        map = input.splitlines()
-)
+        start = next(
-
+            (i, j)
-# part 1
+            for i in range(len(map))
-answer_1 = len(reachable(map, {start}, 6 if len(map) < 20 else 64))
+            for j in range(len(map[i]))
-print(f"answer 1 is {answer_1}")
+            if map[i][j] == "S"
 # part 2
 # the initial map is a square and contains an empty rhombus whose diameter is the size
 # of the map, and has only empty cells around the middle row and column
 #
 # after ~n/2 steps, the first map is filled with a rhombus, after that we get a bigger
 # rhombus every n steps
 #
 # we are going to find the number of cells reached for the initial rhombus, n steps
 # after and n * 2 steps after
 #
 cycle = len(map)
 rhombus = (len(map) - 3) // 2 + 1
 values: list[int] = []
 values.append(len(tiles := reachable(map, {start}, rhombus)))
 values.append(len(tiles := reachable(map, tiles, cycle)))
 values.append(len(tiles := reachable(map, tiles, cycle)))
 if logging.root.getEffectiveLevel() == logging.INFO:
    n_rows, n_cols = len(map), len(map[0])
    rows = [
        [
            map[i % n_rows][j % n_cols] if (i, j) not in tiles else "O"
            for j in range(-2 * cycle, 3 * cycle)
        ]
        for i in range(-2 * cycle, 3 * cycle)
    ]
    for i in range(len(rows)):
        for j in range(len(rows[i])):
            if (i // cycle) % 2 == (j // cycle) % 2:
                rows[i][j] = f"\033[91m{rows[i][j]}\033[0m"
    print("\n".join("".join(row) for row in rows))
 logging.info(f"values to fit: {values}")
 # version 1:
 #
 # after 3 cycles, the figure looks like the following:
 #
 #   I M D
 # I J A K D
 # H A F A L
 # C E A K B
 #   C G B
 #
 # after 4 cycles, the figure looks like the following:
 #
 #     I M D
 #   I J A K D
 # I J A B A K D
 # H A B A B A L
 # C E A B A N F
 #   C E A N F
 #     C G F
 #
 # the 'radius' of the rhombus is the number of cycles minus 1
 #
 # the 4 'corner' (M, H, L, G) are counted once, the blocks with a corner triangle (D, I,
 # C, B) are each counted radius times, the blocks with everything but one corner (J, K,
 # E, N) are each counted radius - 1 times
 #
 # there are two versions of the whole block, A and B in the above (or odd and even),
 # depending on the number of cycles, either A or B will be in the center
 #
 counts = [
    [
        sum(
            (i, j) in tiles
            for i in range(ci * cycle, (ci + 1) * cycle)
            for j in range(cj * cycle, (cj + 1) * cycle)
        )
        for cj in range(-2, 3)
    ]
    for ci in range(-2, 3)
 ]
-radius = (26501365 - rhombus) // cycle - 1
+        # part 1
-A = counts[2][2] if radius % 2 == 0 else counts[2][1]
+        yield len(reachable(map, {start}, 6 if len(map) < 20 else 64))
 B = counts[2][2] if radius % 2 == 1 else counts[2][1]
 answer_2 = (
    (radius + 1) * A
    + radius * B
    + 2 * radius * (radius + 1) // 2 * A
    + 2 * radius * (radius - 1) // 2 * B
    + sum(counts[i][j] for i, j in ((0, 2), (-1, 2), (2, 0), (2, -1)))
    + sum(counts[i][j] for i, j in ((0, 1), (0, 3), (-1, 1), (-1, 3))) * (radius + 1)
    + sum(counts[i][j] for i, j in ((1, 1), (1, 3), (-2, 1), (-2, 3))) * radius
 )
 print(f"answer 2 (v1) is {answer_2}")
-# version 2: fitting a polynomial
+        # part 2
 #
 # the value we are interested in (26501365) can be written as R + K * C where R is the
 # step at which we find the first rhombus, and K the repeat step, so instead of fitting
 # for X values (R, R + K, R + 2 K), we are going to fit for (0, 1, 2), giving us much
 # simpler equation for the a, b and c coefficient
 #
 # we get:
 #   - (a * 0² + b * 0 + c) = y1  =>  c = y1
 #   - (a * 1² + b * 1 + c) = y2  =>  a + b = y2 - y1
 #                                =>  b = y2 - y1 - a
 #   - (a * 2² + b * 2 + c) = y3  =>  4a + 2b = y3 - y1
 #                                =>  4a + 2(y2 - y1 - a) = y3 - y1
 #                                =>  a = (y1 + y3) / 2 - y2
 #
 y1, y2, y3 = values
 a, b, c = (y1 + y3) // 2 - y2, 2 * y2 - (3 * y1 + y3) // 2, y1
-n = (26501365 - rhombus) // cycle
+        # the initial map is a square and contains an empty rhombus whose diameter is
-answer_2 = a * n * n + b * n + c
+        # the size of the map, and has only empty cells around the middle row and column
-print(f"answer 2 (v2) is {answer_2}")
+        #
        # after ~n/2 steps, the first map is filled with a rhombus, after that we get a
        # bigger rhombus every n steps
        #
        # we are going to find the number of cells reached for the initial rhombus, n
        # steps after and n * 2 steps after
        #
        cycle = len(map)
        rhombus = (len(map) - 3) // 2 + 1
        values: list[int] = []
        values.append(len(tiles := reachable(map, {start}, rhombus)))
        values.append(len(tiles := reachable(map, tiles, cycle)))
        values.append(len(tiles := reachable(map, tiles, cycle)))
        if self.files:
            n_rows, n_cols = len(map), len(map[0])
            rows = [
                [
                    map[i % n_rows][j % n_cols] if (i, j) not in tiles else "O"
                    for j in range(-2 * cycle, 3 * cycle)
                ]
                for i in range(-2 * cycle, 3 * cycle)
            ]
            for i in range(len(rows)):
                for j in range(len(rows[i])):
                    if (i // cycle) % 2 == (j // cycle) % 2:
                        rows[i][j] = f"\033[91m{rows[i][j]}\033[0m"
            self.files.create(
                "cycle.txt", "\n".join("".join(row) for row in rows).encode(), True
            )
        self.logger.info(f"values to fit: {values}")
        # version 1:
        #
        # after 3 cycles, the figure looks like the following:
        #
        #   I M D
        # I J A K D
        # H A F A L
        # C E A K B
        #   C G B
        #
        # after 4 cycles, the figure looks like the following:
        #
        #     I M D
        #   I J A K D
        # I J A B A K D
        # H A B A B A L
        # C E A B A N F
        #   C E A N F
        #     C G F
        #
        # the 'radius' of the rhombus is the number of cycles minus 1
        #
        # the 4 'corner' (M, H, L, G) are counted once, the blocks with a corner triangle (D, I,
        # C, B) are each counted radius times, the blocks with everything but one corner (J, K,
        # E, N) are each counted radius - 1 times
        #
        # there are two versions of the whole block, A and B in the above (or odd and even),
        # depending on the number of cycles, either A or B will be in the center
        #
        # counts = [
        #     [
        #         sum(
        #             (i, j) in tiles
        #             for i in range(ci * cycle, (ci + 1) * cycle)
        #             for j in range(cj * cycle, (cj + 1) * cycle)
        #         )
        #         for cj in range(-2, 3)
        #     ]
        #     for ci in range(-2, 3)
        # ]
        # radius = (26501365 - rhombus) // cycle - 1
        # A = counts[2][2] if radius % 2 == 0 else counts[2][1]
        # B = counts[2][2] if radius % 2 == 1 else counts[2][1]
        # answer_2 = (
        #     (radius + 1) * A
        #     + radius * B
        #     + 2 * radius * (radius + 1) // 2 * A
        #     + 2 * radius * (radius - 1) // 2 * B
        #     + sum(counts[i][j] for i, j in ((0, 2), (-1, 2), (2, 0), (2, -1)))
        #     + sum(counts[i][j] for i, j in ((0, 1), (0, 3), (-1, 1), (-1, 3)))
        #     * (radius + 1)
        #     + sum(counts[i][j] for i, j in ((1, 1), (1, 3), (-2, 1), (-2, 3))) * radius
        # )
        # version 2: fitting a polynomial
        #
        # the value we are interested in (26501365) can be written as R + K * C where R is the
        # step at which we find the first rhombus, and K the repeat step, so instead of fitting
        # for X values (R, R + K, R + 2 K), we are going to fit for (0, 1, 2), giving us much
        # simpler equation for the a, b and c coefficient
        #
        # we get:
        #   - (a * 0² + b * 0 + c) = y1  =>  c = y1
        #   - (a * 1² + b * 1 + c) = y2  =>  a + b = y2 - y1
        #                                =>  b = y2 - y1 - a
        #   - (a * 2² + b * 2 + c) = y3  =>  4a + 2b = y3 - y1
        #                                =>  4a + 2(y2 - y1 - a) = y3 - y1
        #                                =>  a = (y1 + y3) / 2 - y2
        #
        y1, y2, y3 = values
        a, b, c = (y1 + y3) // 2 - y2, 2 * y2 - (3 * y1 + y3) // 2, y1
        n = (26501365 - rhombus) // cycle
        yield a * n * n + b * n + c
--- a/src/holt59/aoc/2023/day22.py
+++ b/src/holt59/aoc/2023/day22.py
@ -1,111 +1,109 @@
 import itertools
 import logging
 import os
 import string
 import sys
 from collections import defaultdict
 from typing import Any, Iterator
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
        def _name(i: int) -> str:
            if len(lines) < 26:
                return string.ascii_uppercase[i]
            return f"B{i:04d}"
-def _name(i: int) -> str:
+        def build_supports(
-    if len(lines) < 26:
+            bricks: list[tuple[tuple[int, int, int], tuple[int, int, int]]],
-        return string.ascii_uppercase[i]
+        ) -> tuple[dict[int, set[int]], dict[int, set[int]]]:
-    return f"B{i:04d}"
+            # 1. compute locations where a brick of sand will land after falling by processing
            # them in sorted order of bottom z location
            levels: dict[tuple[int, int, int], int] = defaultdict(lambda: -1)
            for i_brick, ((sx, sy, sz), (ex, ey, ez)) in enumerate(bricks):
                assert sx <= ex and sy <= ey and sz <= ez
                xs, ys = range(sx, ex + 1), range(sy, ey + 1)
-def build_supports(
+                for z in range(sz - 1, 0, -1):
-    bricks: list[tuple[tuple[int, int, int], tuple[int, int, int]]],
+                    if any(levels[x, y, z] >= 0 for x, y in itertools.product(xs, ys)):
-) -> tuple[dict[int, set[int]], dict[int, set[int]]]:
+                        break
-    # 1. compute locations where a brick of sand will land after falling by processing
+                    sz, ez = sz - 1, ez - 1
    # them in sorted order of bottom z location
    levels: dict[tuple[int, int, int], int] = defaultdict(lambda: -1)
    for i_brick, ((sx, sy, sz), (ex, ey, ez)) in enumerate(bricks):
        assert sx <= ex and sy <= ey and sz <= ez
-        xs, ys = range(sx, ex + 1), range(sy, ey + 1)
+                bricks[i_brick] = ((sx, sy, sz), (ex, ey, ez))
                zs = range(sz, ez + 1)
-        for z in range(sz - 1, 0, -1):
+                for x, y, z in itertools.product(xs, ys, zs):
-            if any(levels[x, y, z] >= 0 for x, y in itertools.product(xs, ys)):
+                    levels[x, y, z] = i_brick
                break
            sz, ez = sz - 1, ez - 1
-        bricks[i_brick] = ((sx, sy, sz), (ex, ey, ez))
+            # 2. compute the bricks that supports any brick
-        zs = range(sz, ez + 1)
+            supported_by: dict[int, set[int]] = {}
            supports: dict[int, set[int]] = {
                i_brick: set() for i_brick in range(len(bricks))
            }
            for i_brick, ((sx, sy, sz), (ex, ey, ez)) in enumerate(bricks):
                name = _name(i_brick)
-        for x, y, z in itertools.product(xs, ys, zs):
+                supported_by[i_brick] = {
-            levels[x, y, z] = i_brick
+                    v
                    for x, y in itertools.product(range(sx, ex + 1), range(sy, ey + 1))
                    if (v := levels[x, y, sz - 1]) != -1
                }
                self.logger.info(
                    f"{name} supported by {', '.join(map(_name, supported_by[i_brick]))}"
                )
-    # 2. compute the bricks that supports any brick
+                for support in supported_by[i_brick]:
-    supported_by: dict[int, set[int]] = {}
+                    supports[support].add(i_brick)
    supports: dict[int, set[int]] = {i_brick: set() for i_brick in range(len(bricks))}
    for i_brick, ((sx, sy, sz), (ex, ey, ez)) in enumerate(bricks):
        name = _name(i_brick)
-        supported_by[i_brick] = {
+            return supported_by, supports
-            v
+
-            for x, y in itertools.product(range(sx, ex + 1), range(sy, ey + 1))
+        bricks: list[tuple[tuple[int, int, int], tuple[int, int, int]]] = []
-            if (v := levels[x, y, sz - 1]) != -1
+        for line in lines:
-        }
+            bricks.append(
-        logging.info(
+                (
-            f"{name} supported by {', '.join(map(_name, supported_by[i_brick]))}"
+                    tuple(int(c) for c in line.split("~")[0].split(",")),  # type: ignore
                    tuple(int(c) for c in line.split("~")[1].split(",")),  # type: ignore
                )
            )
        # sort bricks by bottom z position to compute supports
        bricks = sorted(bricks, key=lambda b: b[0][-1])
        supported_by, supports = build_supports(bricks)
        # part 1
        yield len(bricks) - sum(
            any(len(supported_by[supported]) == 1 for supported in supports_to)
            for supports_to in supports.values()
        )
-        for support in supported_by[i_brick]:
+        # part 2
-            supports[support].add(i_brick)
+        falling_in_chain: dict[int, set[int]] = {}
        for i_brick in range(len(bricks)):
            to_disintegrate: set[int] = {
                supported
                for supported in supports[i_brick]
                if len(supported_by[supported]) == 1
            }
-    return supported_by, supports
+            supported_by_copy = dict(supported_by)
            falling_in_chain[i_brick] = set()
            while to_disintegrate:
                falling_in_chain[i_brick].update(to_disintegrate)
-bricks: list[tuple[tuple[int, int, int], tuple[int, int, int]]] = []
+                to_disintegrate_v: set[int] = set()
 for line in lines:
    bricks.append(
        (
            tuple(int(c) for c in line.split("~")[0].split(",")),  # type: ignore
            tuple(int(c) for c in line.split("~")[1].split(",")),  # type: ignore
        )
    )
-# sort bricks by bottom z position to compute supports
+                for d_brick in to_disintegrate:
-bricks = sorted(bricks, key=lambda b: b[0][-1])
+                    for supported in supports[d_brick]:
-supported_by, supports = build_supports(bricks)
+                        supported_by_copy[supported] = supported_by_copy[supported] - {
                            d_brick
                        }
-# part 1
+                        if not supported_by_copy[supported]:
-answer_1 = len(bricks) - sum(
+                            to_disintegrate_v.add(supported)
    any(len(supported_by[supported]) == 1 for supported in supports_to)
    for supports_to in supports.values()
 )
 print(f"answer 1 is {answer_1}")
-# part 2
+                to_disintegrate = to_disintegrate_v
 falling_in_chain: dict[int, set[int]] = {}
 for i_brick in range(len(bricks)):
    to_disintegrate: set[int] = {
        supported
        for supported in supports[i_brick]
        if len(supported_by[supported]) == 1
    }
-    supported_by_copy = dict(supported_by)
+        yield sum(len(falling) for falling in falling_in_chain.values())
    falling_in_chain[i_brick] = set()
    while to_disintegrate:
        falling_in_chain[i_brick].update(to_disintegrate)
        to_disintegrate_v: set[int] = set()
        for d_brick in to_disintegrate:
            for supported in supports[d_brick]:
                supported_by_copy[supported] = supported_by_copy[supported] - {d_brick}
                if not supported_by_copy[supported]:
                    to_disintegrate_v.add(supported)
        to_disintegrate = to_disintegrate_v
 answer_2 = sum(len(falling) for falling in falling_in_chain.values())
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day23.py
+++ b/src/holt59/aoc/2023/day23.py
@ -1,11 +1,7 @@
 import logging
 import os
 import sys
 from collections import defaultdict
-from typing import Literal, Sequence, TypeAlias, cast
+from typing import Any, Iterator, Literal, Sequence, TypeAlias, cast
-VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+from ..base import BaseSolver
 logging.basicConfig(level=logging.INFO if VERBOSE else logging.WARNING)
 DirectionType: TypeAlias = Literal[">", "<", "^", "v", ".", "#"]
@ -35,6 +31,7 @@ def neighbors(
    Compute neighbors of the given node, ignoring the given set of nodes and considering
    that you can go uphill on slopes.
    """
    n_rows, n_cols = len(grid), len(grid[0])
    i, j = node
    for di, dj in Neighbors[grid[i][j]]:
@ -103,65 +100,66 @@ def compute_direct_links(
    return direct
-def longest_path_length(
+class Solver(BaseSolver):
-    links: dict[tuple[int, int], list[tuple[tuple[int, int], int]]],
+    def longest_path_length(
-    start: tuple[int, int],
+        self,
-    target: tuple[int, int],
+        links: dict[tuple[int, int], list[tuple[tuple[int, int], int]]],
-) -> int:
+        start: tuple[int, int],
-    max_distance: int = -1
+        target: tuple[int, int],
-    queue: list[tuple[tuple[int, int], int, frozenset[tuple[int, int]]]] = [
+    ) -> int:
-        (start, 0, frozenset({start}))
+        max_distance: int = -1
-    ]
+        queue: list[tuple[tuple[int, int], int, frozenset[tuple[int, int]]]] = [
            (start, 0, frozenset({start}))
        ]
-    nodes = 0
+        nodes = 0
-    while queue:
+        while queue:
-        node, distance, path = queue.pop()
+            node, distance, path = queue.pop()
-        nodes += 1
+            nodes += 1
-        if node == target:
+            if node == target:
-            max_distance = max(distance, max_distance)
+                max_distance = max(distance, max_distance)
-            continue
+                continue
-        queue.extend(
+            queue.extend(
-            (reach, distance + length, path | {reach})
+                (reach, distance + length, path | {reach})
-            for reach, length in links.get(node, [])
+                for reach, length in links.get(node, [])
-            if reach not in path
+                if reach not in path
            )
        self.logger.info(f"processed {nodes} nodes")
        return max_distance
    def solve(self, input: str) -> Iterator[Any]:
        lines = cast(list[Sequence[DirectionType]], input.splitlines())
        start = (0, 1)
        target = (len(lines) - 1, len(lines[0]) - 2)
        direct_links: dict[tuple[int, int], list[tuple[tuple[int, int], int]]] = {
            start: [reachable(lines, start, target)]
        }
        direct_links.update(
            compute_direct_links(lines, direct_links[start][0][0], target)
        )
-    logging.info(f"processed {nodes} nodes")
+        # part 1
        yield self.longest_path_length(direct_links, start, target)
-    return max_distance
+        # part 2
        reverse_links: dict[tuple[int, int], list[tuple[tuple[int, int], int]]] = (
            defaultdict(list)
        )
        for origin, links in direct_links.items():
            for destination, distance in links:
                if origin != start:
                    reverse_links[destination].append((origin, distance))
        links = {
            k: direct_links.get(k, []) + reverse_links.get(k, [])
            for k in direct_links.keys() | reverse_links.keys()
        }
-lines = cast(list[Sequence[DirectionType]], sys.stdin.read().splitlines())
+        yield self.longest_path_length(links, start, target)
 n_rows, n_cols = len(lines), len(lines[0])
 start = (0, 1)
 target = (len(lines) - 1, len(lines[0]) - 2)
 direct_links: dict[tuple[int, int], list[tuple[tuple[int, int], int]]] = {
    start: [reachable(lines, start, target)]
 }
 direct_links.update(compute_direct_links(lines, direct_links[start][0][0], target))
 # part 1
 answer_1 = longest_path_length(direct_links, start, target)
 print(f"answer 1 is {answer_1}")
 # part 2
 reverse_links: dict[tuple[int, int], list[tuple[tuple[int, int], int]]] = defaultdict(
    list
 )
 for origin, links in direct_links.items():
    for destination, distance in links:
        if origin != start:
            reverse_links[destination].append((origin, distance))
 links = {
    k: direct_links.get(k, []) + reverse_links.get(k, [])
    for k in direct_links.keys() | reverse_links.keys()
 }
 answer_2 = longest_path_length(links, start, target)
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day24.py
+++ b/src/holt59/aoc/2023/day24.py
@ -1,63 +1,69 @@
-import sys
+from typing import Any, Iterator
 import numpy as np
 from sympy import solve, symbols
-lines = sys.stdin.read().splitlines()
+from ..base import BaseSolver
 positions = np.array(
    [[int(c) for c in line.split("@")[0].strip().split(", ")] for line in lines]
 )
 velocities = np.array(
    [[int(c) for c in line.split("@")[1].strip().split(", ")] for line in lines]
 )
 # part 1
 low, high = [7, 27] if len(positions) <= 10 else [200000000000000, 400000000000000]
 count = 0
 for i1, (p1, v1) in enumerate(zip(positions, velocities)):
    p, r = p1[:2], v1[:2]
    q, s = positions[i1 + 1 :, :2], velocities[i1 + 1 :, :2]
    rs = np.cross(r, s)
    q, s, rs = q[m := (rs != 0)], s[m], rs[m]
    t = np.cross((q - p), s) / rs
    u = np.cross((q - p), r) / rs
    t, u = t[m := ((t >= 0) & (u >= 0))], u[m]
    c = p + np.expand_dims(t, 1) * r
    count += np.all((low <= c) & (c <= high), axis=1).sum()
-answer_1 = count
+class Solver(BaseSolver):
-print(f"answer 1 is {answer_1}")
+    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-# part 2
+        positions = np.array(
-# equation
+            [[int(c) for c in line.split("@")[0].strip().split(", ")] for line in lines]
-#   p1 + t1 * v1 == p0 + t1 * v0
+        )
-#   p2 + t2 * v2 == p0 + t2 * v0
+        velocities = np.array(
-#   p3 + t3 * v3 == p0 + t3 * v0
+            [[int(c) for c in line.split("@")[1].strip().split(", ")] for line in lines]
-#      ...
+        )
 #   pn + tn * vn == p0 + tn * v0
 #
-# we can solve with only 3 lines since each lines contains 3
+        # part 1
-# equations (x / y / z), so 3 lines give 9 equations and 9
+        low, high = (
-# variables: position (3), velocities (3) and times (3).
+            [7, 27] if len(positions) <= 10 else [200000000000000, 400000000000000]
-n = 3
+        )
-x, y, z, vx, vy, vz, *ts = symbols(
+        count = 0
-    "x y z vx vy vz " + " ".join(f"t{i}" for i in range(n + 1))
+        for i1, (p1, v1) in enumerate(zip(positions, velocities)):
-)
+            p, r = p1[:2], v1[:2]
 equations = []
 for i1, ti in zip(range(n), ts):
    for p, d, pi, di in zip((x, y, z), (vx, vy, vz), positions[i1], velocities[i1]):
        equations.append(p + ti * d - pi - ti * di)
-r = solve(equations, [x, y, z, vx, vy, vz] + list(ts), dict=True)[0]
+            q, s = positions[i1 + 1 :, :2], velocities[i1 + 1 :, :2]
-answer_2 = r[x] + r[y] + r[z]
+            rs = np.cross(r, s)
-print(f"answer 2 is {answer_2}")
+
            q, s, rs = q[m := (rs != 0)], s[m], rs[m]
            t = np.cross((q - p), s) / rs
            u = np.cross((q - p), r) / rs
            t, u = t[m := ((t >= 0) & (u >= 0))], u[m]
            c = p + np.expand_dims(t, 1) * r
            count += np.all((low <= c) & (c <= high), axis=1).sum()
        yield count
        # part 2
        # equation
        #   p1 + t1 * v1 == p0 + t1 * v0
        #   p2 + t2 * v2 == p0 + t2 * v0
        #   p3 + t3 * v3 == p0 + t3 * v0
        #      ...
        #   pn + tn * vn == p0 + tn * v0
        #
        # we can solve with only 3 lines since each lines contains 3
        # equations (x / y / z), so 3 lines give 9 equations and 9
        # variables: position (3), velocities (3) and times (3).
        n = 3
        x, y, z, vx, vy, vz, *ts = symbols(
            "x y z vx vy vz " + " ".join(f"t{i}" for i in range(n + 1))
        )
        equations = []
        for i1, ti in zip(range(n), ts):
            for p, d, pi, di in zip(
                (x, y, z), (vx, vy, vz), positions[i1], velocities[i1]
            ):
                equations.append(p + ti * d - pi - ti * di)
        print(equations)
        r = solve(equations, [x, y, z, vx, vy, vz] + list(ts), dict=True)[0]
        yield r[x] + r[y] + r[z]
--- a/src/holt59/aoc/2023/day25.py
+++ b/src/holt59/aoc/2023/day25.py
@ -1,25 +1,25 @@
-import sys
+# pyright: reportUnknownMemberType=false
 from typing import Any, Iterator
 import networkx as nx
-components = {
+from ..base import BaseSolver
    (p := line.split(": "))[0]: p[1].split() for line in sys.stdin.read().splitlines()
 }
 targets = {t for c in components for t in components[c] if t not in components}
-graph = nx.Graph()
+class Solver(BaseSolver):
-graph.add_edges_from((u, v) for u, vs in components.items() for v in vs)
+    def solve(self, input: str) -> Iterator[Any]:
        components = {
            (p := line.split(": "))[0]: p[1].split() for line in input.splitlines()
        }
-cut = nx.minimum_edge_cut(graph)
+        graph: "nx.Graph[str]" = nx.Graph()
-graph.remove_edges_from(cut)
+        graph.add_edges_from((u, v) for u, vs in components.items() for v in vs)
-c1, c2 = nx.connected_components(graph)
+        cut = nx.minimum_edge_cut(graph)
        graph.remove_edges_from(cut)
-# part 1
+        c1, c2 = nx.connected_components(graph)
 answer_1 = len(c1) * len(c2)
 print(f"answer 1 is {answer_1}")
-# part 2
+        # part 1
-answer_2 = ...
+        yield len(c1) * len(c2)
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day3.py
+++ b/src/holt59/aoc/2023/day3.py
@ -1,53 +1,53 @@
 import string
 import sys
 from collections import defaultdict
 from typing import Any, Iterator
 from ..base import BaseSolver
 NOT_A_SYMBOL = "." + string.digits
 lines = sys.stdin.read().splitlines()
-values: list[int] = []
+class Solver(BaseSolver):
-gears: dict[tuple[int, int], list[int]] = defaultdict(list)
+    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-for i, line in enumerate(lines):
+        values: list[int] = []
-    j = 0
+        gears: dict[tuple[int, int], list[int]] = defaultdict(list)
    while j < len(line):
        # skip everything until a digit is found (start of a number)
        if line[j] not in string.digits:
            j += 1
            continue
-        # extract the range of the number and its value
+        for i, line in enumerate(lines):
-        k = j + 1
+            j = 0
-        while k < len(line) and line[k] in string.digits:
+            while j < len(line):
-            k += 1
+                # skip everything until a digit is found (start of a number)
                if line[j] not in string.digits:
                    j += 1
                    continue
-        value = int(line[j:k])
+                # extract the range of the number and its value
                k = j + 1
                while k < len(line) and line[k] in string.digits:
                    k += 1
-        # lookup around the number if there is a symbol - we go through the number
+                value = int(line[j:k])
        # itself but that should not matter since it only contains digits
        found = False
        for i2 in range(max(0, i - 1), min(i + 1, len(lines) - 1) + 1):
            for j2 in range(max(0, j - 1), min(k, len(line) - 1) + 1):
                assert i2 >= 0 and i2 < len(lines)
                assert j2 >= 0 and j2 < len(line)
-                if lines[i2][j2] not in NOT_A_SYMBOL:
+                # lookup around the number if there is a symbol - we go through the number
-                    found = True
+                # itself but that should not matter since it only contains digits
                found = False
                for i2 in range(max(0, i - 1), min(i + 1, len(lines) - 1) + 1):
                    for j2 in range(max(0, j - 1), min(k, len(line) - 1) + 1):
                        assert i2 >= 0 and i2 < len(lines)
                        assert j2 >= 0 and j2 < len(line)
-                    if lines[i2][j2] == "*":
+                        if lines[i2][j2] not in NOT_A_SYMBOL:
-                        gears[i2, j2].append(value)
+                            found = True
-        if found:
+                            if lines[i2][j2] == "*":
-            values.append(value)
+                                gears[i2, j2].append(value)
-        # continue starting from the end of the number
+                if found:
-        j = k
+                    values.append(value)
-# part 1
+                # continue starting from the end of the number
-answer_1 = sum(values)
+                j = k
 print(f"answer 1 is {answer_1}")
-# part 2
+        yield sum(values)
-answer_2 = sum(v1 * v2 for v1, v2 in filter(lambda vs: len(vs) == 2, gears.values()))
+        yield sum(v1 * v2 for v1, v2 in filter(lambda vs: len(vs) == 2, gears.values()))
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day4.py
+++ b/src/holt59/aoc/2023/day4.py
@ -1,5 +1,7 @@
 import sys
 from dataclasses import dataclass
 from typing import Any, Iterator
 from ..base import BaseSolver
@dataclass(frozen=True)
@ -9,33 +11,34 @@ class Card:
    values: list[int]
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-cards: list[Card] = []
+        cards: list[Card] = []
-for line in lines:
+        for line in lines:
-    id_part, e_part = line.split(":")
+            id_part, e_part = line.split(":")
-    numbers_s, values_s = e_part.split("|")
+            numbers_s, values_s = e_part.split("|")
-    cards.append(
+            cards.append(
-        Card(
+                Card(
-            id=int(id_part.split()[1]),
+                    id=int(id_part.split()[1]),
-            numbers=[int(v.strip()) for v in numbers_s.strip().split()],
+                    numbers=[int(v.strip()) for v in numbers_s.strip().split()],
-            values=[int(v.strip()) for v in values_s.strip().split()],
+                    values=[int(v.strip()) for v in values_s.strip().split()],
-        )
+                )
-    )
+            )
-winnings = [sum(1 for n in card.values if n in card.numbers) for card in cards]
+        winnings = [sum(1 for n in card.values if n in card.numbers) for card in cards]
-# part 1
+        # part 1
-answer_1 = sum(2 ** (winning - 1) for winning in winnings if winning > 0)
+        yield sum(2 ** (winning - 1) for winning in winnings if winning > 0)
 print(f"answer 1 is {answer_1}")
-# part 2
+        # part 2
-card2cards = {i: list(range(i + 1, i + w + 1)) for i, w in enumerate(winnings)}
+        card2cards = {i: list(range(i + 1, i + w + 1)) for i, w in enumerate(winnings)}
-card2values = {i: 0 for i in range(len(cards))}
+        card2values = {i: 0 for i in range(len(cards))}
-for i in range(len(cards)):
+        for i in range(len(cards)):
-    card2values[i] += 1
+            card2values[i] += 1
-    for j in card2cards[i]:
+            for j in card2cards[i]:
-        card2values[j] += card2values[i]
+                card2values[j] += card2values[i]
-print(f"answer 2 is {sum(card2values.values())}")
+        yield sum(card2values.values())
--- a/src/holt59/aoc/2023/day5.py
+++ b/src/holt59/aoc/2023/day5.py
@ -1,5 +1,6 @@
-import sys
+from typing import Any, Iterator, Sequence
-from typing import Sequence
+
 from ..base import BaseSolver
 MAP_ORDER = [
    "seed",
@ -12,55 +13,6 @@ MAP_ORDER = [
    "location",
 ]
 lines = sys.stdin.read().splitlines()
 # mappings from one category to another, each list contains
 # ranges stored as (source, target, length), ordered by start and
 # completed to have no "hole"
 maps: dict[tuple[str, str], list[tuple[int, int, int]]] = {}
 # parsing
 index = 2
 while index < len(lines):
    p1, _, p2 = lines[index].split()[0].split("-")
    # extract the existing ranges from the file - we store as (source, target, length)
    # whereas the file is in order (target, source, length)
    index += 1
    values: list[tuple[int, int, int]] = []
    while index < len(lines) and lines[index]:
        n1, n2, n3 = lines[index].split()
        values.append((int(n2), int(n1), int(n3)))
        index += 1
    # sort by source value
    values.sort()
    # add a 'fake' interval starting at 0 if missing
    if values[0][0] != 0:
        values.insert(0, (0, 0, values[0][0]))
    # fill gaps between intervals
    for i in range(len(values) - 1):
        next_start = values[i + 1][0]
        end = values[i][0] + values[i][2]
        if next_start != end:
            values.insert(
                i + 1,
                (end, end, next_start - end),
            )
    # add an interval covering values up to at least 2**32 at the end
    last_start, _, last_length = values[-1]
    values.append((last_start + last_length, last_start + last_length, 2**32))
    assert all(v1[0] + v1[2] == v2[0] for v1, v2 in zip(values[:-1], values[1:]))
    assert values[0][0] == 0
    assert values[-1][0] + values[-1][-1] >= 2**32
    maps[p1, p2] = values
    index += 1
 def find_range(
    values: tuple[int, int], map: list[tuple[int, int, int]]
@ -111,19 +63,71 @@ def find_range(
    return ranges
-def find_location_ranges(seeds: Sequence[tuple[int, int]]) -> Sequence[tuple[int, int]]:
+class Solver(BaseSolver):
-    for map1, map2 in zip(MAP_ORDER[:-1], MAP_ORDER[1:]):
+    def solve(self, input: str) -> Iterator[Any]:
-        seeds = [s2 for s1 in seeds for s2 in find_range(s1, maps[map1, map2])]
+        lines = input.splitlines()
    return seeds
        # mappings from one category to another, each list contains
        # ranges stored as (source, target, length), ordered by start and
        # completed to have no "hole"
        maps: dict[tuple[str, str], list[tuple[int, int, int]]] = {}
-# part 1 - use find_range() with range of length 1
+        def find_location_ranges(
-seeds_p1 = [(int(s), 1) for s in lines[0].split(":")[1].strip().split()]
+            seeds: Sequence[tuple[int, int]],
-answer_1 = min(start for start, _ in find_location_ranges(seeds_p1))
+        ) -> Sequence[tuple[int, int]]:
-print(f"answer 1 is {answer_1}")
+            for map1, map2 in zip(MAP_ORDER[:-1], MAP_ORDER[1:]):
                seeds = [s2 for s1 in seeds for s2 in find_range(s1, maps[map1, map2])]
            return seeds
-# # part 2
+        # parsing
-parts = lines[0].split(":")[1].strip().split()
+        index = 2
-seeds_p2 = [(int(s), int(e)) for s, e in zip(parts[::2], parts[1::2])]
+        while index < len(lines):
-answer_2 = min(start for start, _ in find_location_ranges(seeds_p2))
+            p1, _, p2 = lines[index].split()[0].split("-")
-print(f"answer 2 is {answer_2}")
+
            # extract the existing ranges from the file - we store as (source, target, length)
            # whereas the file is in order (target, source, length)
            index += 1
            values: list[tuple[int, int, int]] = []
            while index < len(lines) and lines[index]:
                n1, n2, n3 = lines[index].split()
                values.append((int(n2), int(n1), int(n3)))
                index += 1
            # sort by source value
            values.sort()
            # add a 'fake' interval starting at 0 if missing
            if values[0][0] != 0:
                values.insert(0, (0, 0, values[0][0]))
            # fill gaps between intervals
            for i in range(len(values) - 1):
                next_start = values[i + 1][0]
                end = values[i][0] + values[i][2]
                if next_start != end:
                    values.insert(
                        i + 1,
                        (end, end, next_start - end),
                    )
            # add an interval covering values up to at least 2**32 at the end
            last_start, _, last_length = values[-1]
            values.append((last_start + last_length, last_start + last_length, 2**32))
            assert all(
                v1[0] + v1[2] == v2[0] for v1, v2 in zip(values[:-1], values[1:])
            )
            assert values[0][0] == 0
            assert values[-1][0] + values[-1][-1] >= 2**32
            maps[p1, p2] = values
            index += 1
        # part 1 - use find_range() with range of length 1
        seeds_p1 = [(int(s), 1) for s in lines[0].split(":")[1].strip().split()]
        yield min(start for start, _ in find_location_ranges(seeds_p1))
        # # part 2
        parts = lines[0].split(":")[1].strip().split()
        seeds_p2 = [(int(s), int(e)) for s, e in zip(parts[::2], parts[1::2])]
        yield min(start for start, _ in find_location_ranges(seeds_p2))
--- a/src/holt59/aoc/2023/day6.py
+++ b/src/holt59/aoc/2023/day6.py
@ -1,5 +1,7 @@
 import math
-import sys
+from typing import Any, Iterator
 from ..base import BaseSolver
 def extreme_times_to_beat(time: int, distance: int) -> tuple[int, int]:
@ -25,23 +27,23 @@ def extreme_times_to_beat(time: int, distance: int) -> tuple[int, int]:
    return t1, t2
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
-# part 1
+        # part 1
-times = list(map(int, lines[0].split()[1:]))
+        times = list(map(int, lines[0].split()[1:]))
-distances = list(map(int, lines[1].split()[1:]))
+        distances = list(map(int, lines[1].split()[1:]))
-answer_1 = math.prod(
+        yield math.prod(
-    t2 - t1 + 1
+            t2 - t1 + 1
-    for t1, t2 in (
+            for t1, t2 in (
-        extreme_times_to_beat(time, distance)
+                extreme_times_to_beat(time, distance)
-        for time, distance in zip(times, distances)
+                for time, distance in zip(times, distances)
-    )
+            )
-)
+        )
 print(f"answer 1 is {answer_1}")
-# part 2
+        # part 2
-time = int(lines[0].split(":")[1].strip().replace(" ", ""))
+        time = int(lines[0].split(":")[1].strip().replace(" ", ""))
-distance = int(lines[1].split(":")[1].strip().replace(" ", ""))
+        distance = int(lines[1].split(":")[1].strip().replace(" ", ""))
-t1, t2 = extreme_times_to_beat(time, distance)
+        t1, t2 = extreme_times_to_beat(time, distance)
-answer_2 = t2 - t1 + 1
+        yield t2 - t1 + 1
 print(f"answer 2 is {answer_2}")
--- a/src/holt59/aoc/2023/day7.py
+++ b/src/holt59/aoc/2023/day7.py
@ -1,5 +1,7 @@
 import sys
 from collections import Counter, defaultdict
 from typing import Any, Iterator
 from ..base import BaseSolver
 class HandTypes:
@ -32,18 +34,17 @@ def extract_key(hand: str, values: dict[str, int], joker: str = "0") -> tuple[in
    )
-lines = sys.stdin.read().splitlines()
+class Solver(BaseSolver):
-cards = [(t[0], int(t[1])) for line in lines if (t := line.split())]
+    def solve(self, input: str) -> Iterator[Any]:
        lines = input.splitlines()
        cards = [(t[0], int(t[1])) for line in lines if (t := line.split())]
        # part 1
        values = {card: value for value, card in enumerate("23456789TJQKA")}
        cards.sort(key=lambda cv: extract_key(cv[0], values=values))
        yield sum(rank * value for rank, (_, value) in enumerate(cards, start=1))
-# part 1
+        # part 2
-values = {card: value for value, card in enumerate("23456789TJQKA")}
+        values = {card: value for value, card in enumerate("J23456789TQKA")}
-cards.sort(key=lambda cv: extract_key(cv[0], values=values))
+        cards.sort(key=lambda cv: extract_key(cv[0], values=values, joker="J"))
-answer_1 = sum(rank * value for rank, (_, value) in enumerate(cards, start=1))
+        yield sum(rank * value for rank, (_, value) in enumerate(cards, start=1))
 print(f"answer 1 is {answer_1}")
 # part 2
 values = {card: value for value, card in enumerate("J23456789TQKA")}
 cards.sort(key=lambda cv: extract_key(cv[0], values=values, joker="J"))
 answer_2 = sum(rank * value for rank, (_, value) in enumerate(cards, start=1))
 print(f"answer 2 is {answer_2}")
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Mikaël Capelle	b9341bdecc	2024 day 22. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-22 14:07:40 +01:00
Mikaël Capelle	ae5527b72d	2024 day 21 part 1. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-21 13:13:31 +01:00
Mikaël Capelle	96f139fe10	2024 day 20. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-20 09:19:12 +01:00
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Mikael CAPELLE	146d025d41	Add generic simple dijkstra method. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-18 10:41:01 +01:00
Mikael CAPELLE	954ef1e6ce	2024 day 18. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-18 08:54:06 +01:00
Mikael CAPELLE	24580fdfd8	Add Thomas input for 2024 day 17. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-17 15:27:21 +01:00
Mikael CAPELLE	7c0a124a5d	2024 day 17 kind-of-generic.	2024-12-17 15:20:30 +01:00
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Mikael CAPELLE	f965eea33a	2024 day 16 no networkx. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-16 16:48:45 +01:00
Mikael CAPELLE	c3c73ee517	2024 day 16, networkx version. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-16 08:19:42 +01:00
Mikaël Capelle	8308940674	Allow creation of avi video. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-15 14:07:32 +01:00
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Mikaël Capelle	b15131bf1e	Add dot file to 2021 day 12. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-14 22:35:18 +01:00
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Mikaël Capelle	51275dd539	2021 day 11. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-14 22:07:05 +01:00
Mikaël Capelle	f1ae1c598f	2021 day 10.	2024-12-14 21:49:05 +01:00
Mikaël Capelle	91ba8ec86f	2015 day 25. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-14 21:02:23 +01:00
Mikaël Capelle	323f810fcd	2015 day 24. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-14 15:21:19 +01:00
Mikaël Capelle	8969ea895f	Handle PNG file generation. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-14 11:52:32 +01:00
Mikaël Capelle	67f7eef636	Update poetry dependencies. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-14 11:10:46 +01:00
Mikaël Capelle	4f8b50577a	2024 day 14. Some checks failed continuous-integration/drone/push Build is failing Details	2024-12-14 10:23:00 +01:00
Mikaël Capelle	67e41503c9	2024 day 13. All checks were successful continuous-integration/drone/push Build is passing Details	2024-12-13 09:15:23 +01:00
Mikael CAPELLE	30e0bb3665	2015 day 23. All checks were successful continuous-integration/drone/push Build is passing Details	2024-12-12 17:19:25 +01:00
Mikael CAPELLE	291c627c79	2024 day 12. All checks were successful continuous-integration/drone/push Build is passing Details	2024-12-12 17:19:00 +01:00
Mikaël Capelle	89306f4a04	UGLY, 2024 day 12. All checks were successful continuous-integration/drone/push Build is passing Details	2024-12-12 07:21:12 +01:00
Mikael CAPELLE	721d69e766	Remove unused functions from previous years. All checks were successful continuous-integration/drone/push Build is passing Details	2024-12-11 15:48:38 +01:00
Mikael CAPELLE	356fd35b08	2024 day 11 without str.	2024-12-11 09:57:47 +01:00
Mikaël Capelle	92bd85e1dd	2024 day 11.	2024-12-11 07:13:28 +01:00
Mikael CAPELLE	22129048e7	Fix 2023 day 20 for API.	2024-12-10 16:54:18 +01:00
Mikael CAPELLE	781e4cd6e1	Remove bad print in 2023 day 21.	2024-12-10 16:22:03 +01:00
Mikael CAPELLE	46558672e8	File handling for API.	2024-12-10 15:39:00 +01:00
Mikael CAPELLE	3c544c559b	Clean 2024 day 10.	2024-12-10 08:46:44 +01:00
Mikaël Capelle	4367a5183a	2024 day 10.	2024-12-10 07:02:39 +01:00
Mikael CAPELLE	03e4e75978	Add TQDM to 2024 day 9.	2024-12-09 10:33:28 +01:00
Mikaël Capelle	98eb515c19	2024 day 9.	2024-12-09 06:55:27 +01:00
Mikaël Capelle	dd3f332870	Fix 2022 day 16 for progress API.	2024-12-08 19:25:21 +01:00
Mikaël Capelle	9d7ef94fa6	Force string type for answer value.	2024-12-08 14:34:57 +01:00
Mikaël Capelle	ce315b8778	Refactor code for API (#3 ) Co-authored-by: Mikael CAPELLE <mikael.capelle@thalesaleniaspace.com> Co-authored-by: Mikaël Capelle <capelle.mikael@gmail.com> Reviewed-on: #3	2024-12-08 13:06:41 +00:00
Mikael CAPELLE	ab4e3e199c	Refactor 2024 day 6 to be a little bit faster.	2024-12-06 14:10:51 +01:00
Mikaël Capelle	2c1a0b919b	2024 day 6, brute force.	2024-12-06 06:50:35 +01:00
Mikael CAPELLE	cd6f97cd7e	Refactor 2024 day 5 without networkx.	2024-12-05 08:28:55 +01:00
Mikaël Capelle	5312755f32	2024 day 5.	2024-12-05 07:25:55 +01:00
Mikael CAPELLE	55cb5ed745	Refactor 2024 day 4.	2024-12-04 09:31:47 +01:00
Mikaël Capelle	f0d8e156a9	2024 day 4.	2024-12-04 07:35:22 +01:00
Mikael CAPELLE	c19279fad3	Refactor 2024 day 3.	2024-12-03 15:22:54 +01:00
Mikaël Capelle	0d50b44c37	Add .drone.yml for CI. (#2 )	2024-12-03 13:38:03 +00:00
Mikael CAPELLE	b32d46b641	Fix linting.	2024-12-03 14:11:29 +01:00
Mikael CAPELLE	5c43eb2c73	2024 day 3.	2024-12-03 08:29:25 +01:00
Mikaël Capelle	540fe37b9d	Fix 2024 day 2.	2024-12-02 18:44:50 +01:00
Mikael CAPELLE	2a4f923552	Update Python dependencies.	2024-12-02 17:08:50 +01:00
Mikael CAPELLE	4821db89cc	2024 day 2.	2024-12-02 15:42:56 +01:00
Mikaël Capelle	d1733a5888	2024 day 1.	2024-12-01 10:26:02 +01:00
Mikaël Capelle	dd8458fa96	2015 day 22, part 1.	2024-12-01 10:25:49 +01:00
Mikaël Capelle	850c66cd8d	2015 day 21.	2024-01-20 17:57:37 +01:00
Mikaël Capelle	2597235d0c	2015 day 20.	2024-01-06 22:07:34 +01:00
Mikaël Capelle	db9a3b3ed3	2015 day 19.	2024-01-06 21:35:48 +01:00
Mikaël Capelle	31b0e9f195	2015 day 18.	2024-01-06 16:43:35 +01:00
Mikaël Capelle	5b07e73382	2015 day 17.	2024-01-06 15:46:43 +01:00
Mikaël Capelle	c1732baa0d	2015 day 16.	2024-01-06 15:27:45 +01:00
Mikaël Capelle	de96ab0e25	2015 day 15.	2024-01-06 15:11:47 +01:00
Mikaël Capelle	cd58b7861b	2015 day 12, 13 & 14.	2024-01-06 14:56:30 +01:00
Mikaël Capelle	8d2f61fa65	2015 day 11.	2024-01-06 11:46:59 +01:00
Mikaël Capelle	3d7dd37c11	2015 day 10.	2024-01-06 11:30:10 +01:00
Mikael CAPELLE	f373528b06	2015 day 9.	2024-01-05 14:46:05 +01:00
Mikael CAPELLE	3fe9555cb1	2015 day 8.	2024-01-05 10:01:02 +01:00
Mikaël Capelle	f94e2bd831	2015 day 4, 5, 6, 7.	2024-01-04 21:05:42 +01:00
Mikael CAPELLE	685f1e56d7	2015 day 3.	2024-01-04 18:36:30 +01:00
Mikael CAPELLE	ea0c9e7812	2015 day 1 & 2.	2024-01-04 18:27:17 +01:00
Mikaël Capelle	52cb793d06	Faster 2023 day 24 (part 1).	2024-01-01 18:44:13 +01:00
Mikaël Capelle	4a2a63b0b0	Minor cleaning 2023.	2023-12-30 19:35:06 +01:00
Mikaël Capelle	9f96abbd43	2023 day 25.	2023-12-25 10:36:36 +01:00
Mikaël Capelle	57bf025622	2023 day 24.	2023-12-25 10:36:29 +01:00
Mikaël Capelle	bcadb68189	2023 day 23.	2023-12-23 11:05:35 +01:00
Mikaël Capelle	d7d7837c1f	2021 day 9.	2023-12-22 21:26:13 +01:00
Mikaël Capelle	82fab771ab	2023 day 22.	2023-12-22 14:49:31 +01:00
Mikaël Capelle	85fff24cc1	2023 day 21, version 2.	2023-12-21 21:56:38 +01:00
Mikael CAPELLE	9326d6c76c	2023 day 21.	2023-12-21 16:47:43 +01:00
Mikael CAPELLE	eefb3ceb44	2023 day 20.	2023-12-20 14:27:25 +01:00
Mikael CAPELLE	2959387bcd	Poetry stuff.	2023-12-19 17:45:33 +01:00
Mikaël Capelle	41b07cfe83	2023 day 19.	2023-12-19 10:41:53 +01:00
Mikael CAPELLE	981e745eb0	2023 day 18.	2023-12-18 11:40:32 +01:00
Mikaël Capelle	8760e47283	2023 day 17.	2023-12-17 18:19:49 +01:00
Mikaël Capelle	1db3ab9090	2023 day 16.	2023-12-16 18:33:11 +01:00
Mikaël Capelle	9a1769e200	2023 day 15.	2023-12-15 16:18:21 +01:00
Mikaël Capelle	8c150c0bb1	2023 day 14.	2023-12-14 19:34:38 +01:00
Mikaël Capelle	69929b28dd	2023 day 13.	2023-12-13 20:05:05 +01:00
Mikaël Capelle	f41b50c9e0	2023 day 12.	2023-12-12 20:20:26 +00:00
Mikaël Capelle	d6b99454d2	2023 day 11.	2023-12-11 10:25:56 +01:00
Mikaël Capelle	1fc3c1632d	2021 day 8.	2023-12-10 20:23:22 +01:00
Mikaël Capelle	9141029557	2023 day 10.	2023-12-10 10:09:12 +01:00
Mikaël Capelle	9d5b57fd56	2021 day 7.	2023-12-09 12:52:46 +01:00
Mikaël Capelle	0756cf74c4	2021 day 6.	2023-12-09 12:36:10 +01:00
Mikaël Capelle	bd5727c758	2021 day 1-5.	2023-12-09 11:01:28 +01:00
Mikaël Capelle	0ebd823656	Clean 2022.	2023-12-09 09:54:53 +01:00
Mikaël Capelle	7c6c9e5995	2023 day 9.	2023-12-09 08:08:46 +01:00
Mikaël Capelle	f4cd8318b0	2023 day 8.	2023-12-08 08:44:03 +01:00
Mikaël Capelle	e06f3da2bd	2023 day 7.	2023-12-08 08:38:08 +01:00
Mikael CAPELLE	fb8a911d4d	Clean 2023.	2023-12-06 08:47:59 +01:00
Mikaël Capelle	4e1c71b221	2023 day 6.	2023-12-06 07:14:26 +01:00
Mikael CAPELLE	0f8a272b71	2023 day 5.	2023-12-05 13:41:17 +01:00
Mikaël Capelle	508c8cdc42	2023 day 5 part 1.	2023-12-05 07:22:56 +01:00
Mikaël Capelle	ee55c807ef	Prepare 2023 days.	2023-12-04 19:32:41 +01:00
Mikaël Capelle	10a5b92740	2023 day 4.	2023-12-04 19:30:44 +01:00
Mikaël Capelle	d3eacd48aa	2023 day 3.	2023-12-03 09:09:25 +01:00
Mikaël Capelle	53f05058f3	2023 day 2.	2023-12-02 09:47:52 +01:00
Mikaël Capelle	c0ea724d4c	Fix 2023 day 1.	2023-12-01 20:27:42 +01:00
Mikael CAPELLE	57c15270dc	2023: Day 1.	2023-12-01 10:41:13 +01:00
Mikael CAPELLE	7533dd0b11	Post-christmas cleaning.	2023-01-06 13:48:18 +01:00
Mikaël Capelle	dd80b30e26	Day 25.	2022-12-25 11:34:49 +01:00
Mikaël Capelle	0508d95e33	Faster day 24.	2022-12-24 23:00:14 +01:00
Mikaël Capelle	f2cc3e4d16	Day 24.	2022-12-24 20:50:37 +01:00
Mikael CAPELLE	9526c383f3	Add day 23.	2022-12-23 13:25:22 +01:00
Mikaël Capelle	dd88a1838d	Ugly day 22.	2022-12-22 23:00:36 +01:00
Mikaël Capelle	72ffd399b3	Update day 22.	2022-12-22 18:46:59 +01:00
Mikael CAPELLE	020ad7c6d1	Update day 22.	2022-12-22 17:22:56 +01:00
Mikael CAPELLE	1fc4d6531d	Update day 22.	2022-12-22 17:00:09 +01:00
Mikael CAPELLE	d8bb659e78	Day 22 part 1.	2022-12-22 14:10:30 +01:00
Mikael CAPELLE	6ade69ac35	Start day 22.	2022-12-22 08:20:09 +01:00
Mikael CAPELLE	ed7149e5f4	Remove tqdm from day 19.	2022-12-21 17:39:43 +01:00
Mikael CAPELLE	e2df3c4825	Day 21.	2022-12-21 09:44:05 +01:00
Mikaël Capelle	266703cdc0	Clean day 20.	2022-12-20 23:39:26 +01:00
Mikaël Capelle	f635ea3c97	Add empty files for following days.	2022-12-20 21:51:38 +01:00
Mikael CAPELLE	304aeb16bd	Faster day 20.	2022-12-20 18:27:09 +01:00
Mikael CAPELLE	ed00c72e59	Day 20, slow.	2022-12-20 13:39:36 +01:00
Mikael CAPELLE	835458e0f3	Start day 20.	2022-12-20 12:35:01 +01:00
Mikaël Capelle	3b9e9a2c8f	Add all tests from previous days.	2022-12-19 22:32:15 +01:00
Mikaël Capelle	fadb2a71c2	Day 19.	2022-12-19 22:09:20 +01:00
Mikael CAPELLE	91434051c6	Tmp	2022-12-19 18:46:16 +01:00
Mikael CAPELLE	c1161f6c1f	Start working on day 19.	2022-12-19 13:51:32 +01:00
Mikaël Capelle	3b4efce02f	Clean day 17.	2022-12-18 16:46:00 +01:00
Mikaël Capelle	2aaf55b72f	Day 18.	2022-12-18 09:57:35 +01:00
Mikaël Capelle	d493856d20	Day 17.	2022-12-17 12:27:05 +01:00
Mikaël Capelle	67647c7923	Day 17.	2022-12-17 12:25:48 +01:00
Mikaël Capelle	3c61e5cb7f	Less BFS for day 16.	2022-12-16 22:56:34 +01:00
Mikaël Capelle	37e0e1ef06	Better day 16.	2022-12-16 22:52:03 +01:00
Mikael CAPELLE	725e18d480	Update ugly day 16.	2022-12-16 18:40:21 +01:00
Mikael CAPELLE	3d383527e4	Add ugly day 16, to be improved...	2022-12-16 09:21:54 +01:00
Mikael CAPELLE	48e8dff52b	Update day 15.	2022-12-15 14:17:04 +01:00
Mikael CAPELLE	0b53406b52	Add day 15.	2022-12-15 09:36:19 +01:00
Mikael CAPELLE	232d019b40	Add day 14.	2022-12-14 09:29:56 +01:00
Mikael CAPELLE	35190adcdf	Clean day 9.	2022-12-13 11:18:31 +01:00
Mikael CAPELLE	d4199b2810	Clean day 13.	2022-12-13 08:59:53 +01:00
Mikael CAPELLE	971c1b0dda	Add day 13.	2022-12-13 08:54:15 +01:00
Mikael CAPELLE	4fe1f521b7	Clean day 12.	2022-12-12 17:55:24 +01:00
Mikael CAPELLE	38b1d86514	One to many Dijkstra.	2022-12-12 17:50:48 +01:00
Mikael CAPELLE	4899583b15	Generic Dijkstra for day 12.	2022-12-12 15:59:19 +01:00
Mikael CAPELLE	792951afa8	Clean day 12.	2022-12-12 10:48:37 +01:00
Mikael CAPELLE	5004aa3376	Add day 12.	2022-12-12 09:35:12 +01:00
Mikaël Capelle	9ba338a4f1	Clean monkey code.	2022-12-11 11:50:23 +01:00
Mikaël Capelle	8795d7a276	Add day 11.	2022-12-11 11:42:47 +01:00
Mikaël Capelle	89adfb151a	Add day 10.	2022-12-10 10:24:23 +01:00
Mikaël Capelle	9fd8a5866a	Add day 9.	2022-12-09 10:45:00 +01:00
Mikael CAPELLE	7564fac345	Add 2022 day 8.	2022-12-08 08:59:25 +01:00
Mikael CAPELLE	6bd27e4bca	Add 2021 day 5.	2022-12-07 18:41:39 +01:00
Mikael CAPELLE	26cfe60f16	Add day 7.	2022-12-07 09:28:06 +01:00
Mikael CAPELLE	32a1220072	Cleaning.	2022-12-06 15:28:46 +01:00
Mikael CAPELLE	9852aea94b	Add day 6.	2022-12-06 09:03:22 +01:00
Mikaël Capelle	f76767ca6d	Add day 4.	2022-12-05 19:09:55 +01:00
Mikael CAPELLE	1b60725e9c	Add day 5.	2022-12-05 08:58:25 +01:00
Mikaël Capelle	b8cb2cb0b9	Day 3.	2022-12-03 11:42:09 +01:00
Mikael CAPELLE	228f7501bb	More comments.	2022-12-02 15:06:37 +01:00
Mikael CAPELLE	f4ef0a2666	Comments.	2022-12-02 09:21:38 +01:00
Mikael CAPELLE	60e68ed31c	Day 2.	2022-12-02 09:12:49 +01:00