Poetry stuff.

src/holt59/aoc/2021/day1.py

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+import sys
+
+lines = sys.stdin.read().splitlines()
+
+values = [int(line) for line in lines]
+
+# part 1
+answer_1 = sum(v2 > v1 for v1, v2 in zip(values[:-1], values[1:]))
+print(f"answer 1 is {answer_1}")
+
+# part 2
+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:]))
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day10.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day11.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day12.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day13.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day14.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day15.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day16.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day17.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day18.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day19.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day2.py

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+import sys
+from math import prod
+from typing import Literal, cast
+
+lines = sys.stdin.read().splitlines()
+
+commands = [
+    (cast(Literal["forward", "up", "down"], (p := line.split())[0]), int(p[1]))
+    for line in lines
+]
+
+
+def depth_and_position(use_aim: bool):
+    aim, pos, depth = 0, 0, 0
+    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:
+            aim += d_depth
+        else:
+            depth += value
+
+    return depth, pos
+
+
+# part 1
+answer_1 = prod(depth_and_position(False))
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = prod(depth_and_position(True))
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day20.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day21.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day22.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day23.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day24.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day25.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day3.py

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+import sys
+from collections import Counter
+from typing import Literal
+
+
+def generator_rating(
+    values: list[str], most_common: bool, default: Literal["0", "1"]
+) -> str:
+    index = 0
+    most_common_idx = 0 if most_common else 1
+
+    while len(values) > 1:
+        cnt = Counter(value[index] for value in values)
+        bit = cnt.most_common(2)[most_common_idx][0]
+        if cnt["0"] == cnt["1"]:
+            bit = default
+        values = [value for value in values if value[index] == bit]
+        index += 1
+
+    return values[0]
+
+
+lines = sys.stdin.read().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)
+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}")

src/holt59/aoc/2021/day4.py

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+import sys
+
+import numpy as np
+
+lines = sys.stdin.read().splitlines()
+
+numbers = [int(c) for c in lines[0].split(",")]
+
+boards = np.asarray(
+    [
+        [[int(c) for c in line.split()] for line in lines[start : start + 5]]
+        for start in range(2, len(lines), 6)
+    ]
+)
+
+# (round, score) for each board (-1 when not found)
+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):
+    # mark boards
+    marked[boards == number] = True
+
+    # check each board for winning
+    for index in range(len(boards)):
+        if winning_rounds[index][0] > 0:
+            continue
+
+        if np.any(np.all(marked[index], axis=0) | np.all(marked[index], axis=1)):
+            winning_rounds[index] = (
+                round,
+                number * int(np.sum(boards[index][~marked[index]])),
+            )
+
+    # all boards are winning - break
+    if np.all(marked.all(axis=1) | marked.all(axis=2)):
+        break
+
+# part 1
+(_, score) = min(winning_rounds, key=lambda w: w[0])
+print(f"answer 1 is {score}")
+
+# part 2
+(_, score) = max(winning_rounds, key=lambda w: w[0])
+print(f"answer 2 is {score}")

src/holt59/aoc/2021/day5.py

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+import sys
+
+import numpy as np
+
+lines: list[str] = sys.stdin.read().splitlines()
+
+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)
+
+x_min, x_max, y_min, y_max = (
+    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()),
+    max(np_sections[:, 1].max(), np_sections[:, 3].max()),
+)
+
+counts_1 = np.zeros((y_max + 1, x_max + 1), dtype=int)
+counts_2 = counts_1.copy()
+
+for (x1, y1), (x2, y2) in sections:
+    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)
+
+    if x1 == x2 or y1 == y2:
+        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
+
+answer_1 = (counts_1 >= 2).sum()
+print(f"answer 1 is {answer_1}")
+
+answer_2 = (counts_2 >= 2).sum()
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day6.py

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+import sys
+
+values = [int(c) for c in sys.stdin.read().strip().split(",")]
+
+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):
+    for day2 in range(day + 9, days, 7):
+        lanterns[day2] += lanterns[day]
+
+# part 1
+answer_1 = sum(v for k, v in lanterns.items() if k < 80) + len(values)
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = sum(lanterns.values()) + len(values)
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day7.py

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+import sys
+
+import numpy as np
+
+positions = np.asarray([int(c) for c in sys.stdin.read().strip().split(",")])
+
+min_position, max_position = positions.min(), positions.max()
+
+# part 1
+answer_1 = min(
+    np.sum(np.abs(positions - position))
+    for position in range(min_position, max_position + 1)
+)
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = min(
+    np.sum(abs(positions - position) * (abs(positions - position) + 1) // 2)
+    for position in range(min_position, max_position + 1)
+)
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day8.py

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+import itertools
+import os
+import sys
+
+VERBOSE = os.getenv("AOC_VERBOSE") == "True"
+
+digits = {
+    "abcefg": 0,
+    "cf": 1,
+    "acdeg": 2,
+    "acdfg": 3,
+    "bcdf": 4,
+    "abdfg": 5,
+    "abdefg": 6,
+    "acf": 7,
+    "abcdefg": 8,
+    "abcdfg": 9,
+}
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+lengths = {len(k) for k, v in digits.items() if v in (1, 4, 7, 8)}
+answer_1 = sum(
+    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
+values: list[int] = []
+
+for line in lines:
+    parts = line.split("|")
+    broken_digits = sorted(parts[0].strip().split(), key=len)
+
+    per_length = {
+        k: list(v)
+        for k, v in itertools.groupby(sorted(broken_digits, key=len), key=len)
+    }
+
+    # a can be found immediately
+    a = next(u for u in per_length[3][0] if u not in per_length[2][0])
+
+    # c and f have only two possible values corresponding to the single entry of
+    # length 2
+    cf = list(per_length[2][0])
+
+    # the only digit of length 4 contains bcdf, so we can deduce bd by removing cf
+    bd = [u for u in per_length[4][0] if u not in cf]
+
+    # the 3 digits of length 5 have a, d and g in common
+    adg = [u for u in per_length[5][0] if all(u in pe for pe in per_length[5][1:])]
+
+    # we can remove a
+    dg = [u for u in adg if u != a]
+
+    # we can deduce d and g
+    d = next(u for u in dg if u in bd)
+    g = next(u for u in dg if u != d)
+
+    # then b
+    b = next(u for u in bd if u != d)
+
+    # f is in the three 6-length digits, while c is only in 2
+    f = next(u for u in cf if all(u in p for p in per_length[6]))
+
+    # c is not f
+    c = next(u for u in cf if u != f)
+
+    # e is the last one
+    e = next(u for u in "abcdefg" if u not in {a, b, c, d, f, g})
+
+    mapping = dict(zip((a, b, c, d, e, f, g), "abcdefg"))
+
+    value = 0
+    for number in parts[1].strip().split():
+        digit = "".join(sorted(mapping[c] for c in number))
+        value = 10 * value + digits[digit]
+
+    if VERBOSE:
+        print(value)
+
+    values.append(value)
+
+
+answer_2 = sum(values)
+print(f"answer 2 is {answer_2}")

src/holt59/aoc/2021/day9.py

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+import sys
+from collections import defaultdict
+from dataclasses import dataclass
+
+lines = sys.stdin.read().splitlines()
+
+# part 1
+answer_1 = ...
+print(f"answer 1 is {answer_1}")
+
+# part 2
+answer_2 = ...
+print(f"answer 2 is {answer_2}")