feat: solve day 24

24/input.txt

@@ -0,0 +1,471 @@
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+seseseswswseseseswsesesewseseseseseswne
+swwwsweswswswswwswswswswswneww
+seeenweseweseesesweeeeeenwe
+nweneneeneeeeeeeeneseeeneene
+wswnewwwwwwwwswswwwswewwww
+swswswseswswswwseseswneswseswseseswswsesw
+swswswswseswswswsenwnweswswswseswsewesw
+nwswnwwnwswnwnwnenwnwenenwsenwne
+nwwnwesenwnwnwnenwwwnwnwewnwnwnwnwswnw
+wswswswnwwwwwneswwswwsewwswwsw
+nenewneneneeneewnenenenenenenwnenenene
+nwseseswswseseseeeseeseneseseseseese
+eswseeseseeewnwseeseseeeseseesese
+nenwnwnwneneeneneneneneneneneneneneswnw
+nwnenwneneneneenwnenenenenenenwnewnene
+nwneneenenenwseeseneeneeenenenewnene
+wneseswsweswswsenwswswswsweeswnwswnw
+swneeswsewswswenweneswnwnesewew
+nwnwnwnwnwnenwnwnwnwsenwsenwwnwnwnwnwnwne
+neswneswnewneswseseswnwnwswnewseswsee
+eenenwseweeneeneneeweneweeene
+nenwwwnwnwneenenenwswnwnwswseenwswnwenw
+sweswnwswsweeswwswnenw
+wsewsewsenwneswnwnwwewswnwweenw
+nenwnenwswnwnenwnwnenenwnenwnenwnenenene
+swwneswwewwswneswwwswswwswwwse
+swsewswwsewwswneswswwseneswswswnesw
+seenenwsweesenwseswnweseeeeenwe
+swwswwswswswweswnwsweswswswswnenwwwsw
+wnwnwwswenwweswenwwwwwnwnwswnw
+swswwswwwswwwwsewwwwwswswwnesw
+neswswswswswswswwswswswswwswswswwwe
+wenwenwwseswwwnewnwseseswwneswneww
+nwswswswneswswwwsewwswswswswswsesww

24/main.py

@@ -0,0 +1,91 @@
+from typing import Iterable
+
+STEP_LOOKUP = {
+    "e":  ( 1,  0),
+    "w":  (-1,  0),
+    "ne": ( 1,  1),
+    "sw": (-1, -1),
+    "nw": ( 0,  1),
+    "se": ( 0, -1),
+}
+
+def read_input(filename: str) -> list[list[str]]:
+    tiles = []
+    with open(filename, "r") as f:
+        for line in f.readlines():
+            line = line.strip()
+            steps = []
+            i = 0
+            while i < len(line):
+                if line[i] == "e" or line[i] == "w":
+                    steps.append(line[i])
+                else:
+                    steps.append(line[i:i+2])
+                    i += 1
+                i += 1
+            tiles.append(steps)
+    return tiles
+
+def get_black_tiles(tiles: list[list[str]]) -> set[tuple[int, int]]:
+    black_tiles = set()
+
+    for steps in tiles:
+        x = 0
+        y = 0
+        for step in steps:
+            dx, dy = STEP_LOOKUP[step]
+            x += dx
+            y += dy
+        if (x, y) in black_tiles:
+            black_tiles.remove((x, y))
+        else:
+            black_tiles.add((x, y))
+
+    return black_tiles
+
+def part1(tiles: list[list[str]]) -> int:
+    return len(get_black_tiles(tiles))
+
+def get_neighbors(tile: tuple[int, int]) -> Iterable[tuple[int, int]]:
+    for offset in STEP_LOOKUP.values():
+        neighbor = (tile[0]+offset[0], tile[1]+offset[1])
+        yield neighbor
+
+def count_neighbors(tiles: set[tuple[int, int]], tile: tuple[int, int]) -> int:
+    count = 0
+    for neighbor in get_neighbors(tile):
+        if neighbor in tiles:
+            count += 1
+    return count
+
+def simulate(black_tiles: set[tuple[int, int]]) -> set[tuple[int, int]]:
+    white_tiles = set()
+    for tile in black_tiles:
+        for neighbor in get_neighbors(tile):
+            if neighbor not in black_tiles:
+                white_tiles.add(neighbor)
+
+    new_black_tiles = set()
+    # Any black tile with zero or more than 2 black tiles immediately adjacent to it is flipped to white.
+    for black_tile in black_tiles:
+        black_count = count_neighbors(black_tiles, black_tile)
+        if black_count == 1 or black_count == 2:
+            new_black_tiles.add(black_tile)
+
+    # Any white tile with exactly 2 black tiles immediately adjacent to it is flipped to black.
+    for white_tile in white_tiles:
+        if count_neighbors(black_tiles, white_tile) == 2:
+            new_black_tiles.add(white_tile)
+
+    return new_black_tiles
+
+def part2(tiles: list[list[str]]) -> int:
+    black_tiles = get_black_tiles(tiles)
+    for _ in range(100):
+        black_tiles = simulate(black_tiles)
+    return len(black_tiles)
+
+if __name__ == "__main__":
+    tiles = read_input("input.txt")
+    print("part1: ", part1(tiles))
+    print("part2: ", part2(tiles))

24/test.txt

@@ -0,0 +1,20 @@
+sesenwnenenewseeswwswswwnenewsewsw
+neeenesenwnwwswnenewnwwsewnenwseswesw
+seswneswswsenwwnwse
+nwnwneseeswswnenewneswwnewseswneseene
+swweswneswnenwsewnwneneseenw
+eesenwseswswnenwswnwnwsewwnwsene
+sewnenenenesenwsewnenwwwse
+wenwwweseeeweswwwnwwe
+wsweesenenewnwwnwsenewsenwwsesesenwne
+neeswseenwwswnwswswnw
+nenwswwsewswnenenewsenwsenwnesesenew
+enewnwewneswsewnwswenweswnenwsenwsw
+sweneswneswneneenwnewenewwneswswnese
+swwesenesewenwneswnwwneseswwne
+enesenwswwswneneswsenwnewswseenwsese
+wnwnesenesenenwwnenwsewesewsesesew
+nenewswnwewswnenesenwnesewesw
+eneswnwswnwsenenwnwnwwseeswneewsenese
+neswnwewnwnwseenwseesewsenwsweewe
+wseweeenwnesenwwwswnew