From 232d019b407ffe1ac170fffd6db9e74c9292ffd3 Mon Sep 17 00:00:00 2001
From: Mikael CAPELLE <capelle.mikael@gmail.com>
Date: Wed, 14 Dec 2022 09:29:56 +0100
Subject: [PATCH] Add day 14.

---
 2022/day14.py         | 144 +++++++++++++++++++++++++++++++++++++++++
 2022/inputs/day14.txt | 146 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 290 insertions(+)
 create mode 100644 2022/day14.py
 create mode 100644 2022/inputs/day14.txt

diff --git a/2022/day14.py b/2022/day14.py
new file mode 100644
index 0000000..829893a
--- /dev/null
+++ b/2022/day14.py
@@ -0,0 +1,144 @@
+# -*- encoding: utf-8 -*-
+
+import sys
+from collections import defaultdict
+from enum import Enum, auto
+from typing import Callable, cast
+
+
+class Cell(Enum):
+    AIR = auto()
+    ROCK = auto()
+    SAND = auto()
+
+    def __str__(self) -> str:
+        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, y in blocks),
+        0,
+        max(x for x, y in blocks),
+        max(y for x, 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],
+    fill_fn: Callable[[int, int], Cell],
+) -> dict[tuple[int, int], Cell]:
+    """
+    Flow sands onto the given set of blocks
+
+    Args:
+        blocks: Blocks containing ROCK position. Modified in-place.
+        stop_fn: Function called with the last (assumed) position of a grain of
+            sand BEFORE adding it to blocks. If the function returns True, the grain
+            is added and a new one is flowed, otherwise, the whole procedure stops
+            and the function returns (without adding the final grain).
+        fill_fn: Function called when the target position of a grain (during the
+            flowing process) is missing from blocks.
+
+    Returns:
+        The input blocks.
+    """
+
+    y_max = max(y for x, y in blocks)
+
+    while True:
+        x, y = 500, 0
+
+        while y <= y_max:
+
+            moved = False
+            for cx, cy in ((x, y + 1), (x - 1, y + 1), (x + 1, y + 1)):
+                if (cx, cy) not in blocks and fill_fn(cx, cy) == Cell.AIR:
+                    x, y = cx, cy
+                    moved = True
+                elif blocks[cx, cy] == Cell.AIR:
+                    x, y = cx, cy
+                    moved = True
+
+                if moved:
+                    break
+
+            if not moved:
+                break
+
+        if stop_fn(x, y):
+            break
+
+        blocks[x, y] = Cell.SAND
+
+    return blocks
+
+
+# === inputs ===
+
+lines = sys.stdin.read().splitlines()
+
+paths: list[list[tuple[int, int]]] = []
+for line in lines:
+    parts = line.split(" -> ")
+    paths.append(
+        [
+            cast(tuple[int, int], tuple(int(c.strip()) for c in part.split(",")))
+            for part in parts
+        ]
+    )
+
+
+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
+
+        for x in range(x_start, x_end):
+            for y in range(y_start, y_end):
+                blocks[x, y] = Cell.ROCK
+
+print_blocks(blocks)
+print()
+
+x_min, y_min, x_max, y_max = (
+    min(x for x, y in blocks),
+    0,
+    max(x for x, y in blocks),
+    max(y for x, y in blocks),
+)
+
+# === part 1 ===
+
+blocks_1 = flow(
+    blocks.copy(), stop_fn=lambda x, y: y > y_max, fill_fn=lambda x, y: Cell.AIR
+)
+print_blocks(blocks_1)
+print(f"answer 1 is {sum(v == Cell.SAND for v in blocks_1.values())}")
+print()
+
+# === 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
+print_blocks(blocks_2)
+print(f"answer 2 is {sum(v == Cell.SAND for v in blocks_2.values())}")
diff --git a/2022/inputs/day14.txt b/2022/inputs/day14.txt
new file mode 100644
index 0000000..b786261
--- /dev/null
+++ b/2022/inputs/day14.txt
@@ -0,0 +1,146 @@
+477,140 -> 481,140
+468,149 -> 472,149
+482,30 -> 482,23 -> 482,30 -> 484,30 -> 484,20 -> 484,30 -> 486,30 -> 486,26 -> 486,30 -> 488,30 -> 488,23 -> 488,30 -> 490,30 -> 490,20 -> 490,30 -> 492,30 -> 492,25 -> 492,30 -> 494,30 -> 494,29 -> 494,30 -> 496,30 -> 496,24 -> 496,30
+465,152 -> 469,152
+482,30 -> 482,23 -> 482,30 -> 484,30 -> 484,20 -> 484,30 -> 486,30 -> 486,26 -> 486,30 -> 488,30 -> 488,23 -> 488,30 -> 490,30 -> 490,20 -> 490,30 -> 492,30 -> 492,25 -> 492,30 -> 494,30 -> 494,29 -> 494,30 -> 496,30 -> 496,24 -> 496,30
+501,140 -> 505,140
+490,43 -> 490,42 -> 490,43 -> 492,43 -> 492,35 -> 492,43 -> 494,43 -> 494,38 -> 494,43 -> 496,43 -> 496,36 -> 496,43 -> 498,43 -> 498,39 -> 498,43 -> 500,43 -> 500,35 -> 500,43 -> 502,43 -> 502,36 -> 502,43
+498,17 -> 503,17
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+492,131 -> 496,131
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+501,116 -> 505,116
+495,122 -> 499,122
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+504,119 -> 508,119
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+471,146 -> 475,146
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+495,134 -> 499,134
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+504,125 -> 508,125
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+490,43 -> 490,42 -> 490,43 -> 492,43 -> 492,35 -> 492,43 -> 494,43 -> 494,38 -> 494,43 -> 496,43 -> 496,36 -> 496,43 -> 498,43 -> 498,39 -> 498,43 -> 500,43 -> 500,35 -> 500,43 -> 502,43 -> 502,36 -> 502,43
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+504,68 -> 504,59 -> 504,68 -> 506,68 -> 506,60 -> 506,68 -> 508,68 -> 508,63 -> 508,68 -> 510,68 -> 510,67 -> 510,68
+486,137 -> 490,137
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+462,155 -> 462,157 -> 457,157 -> 457,162 -> 471,162 -> 471,157 -> 465,157 -> 465,155
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