diff --git a/README.md b/README.md index 9cf7d8e..34a4d8b 100644 --- a/README.md +++ b/README.md @@ -15,5 +15,6 @@ https://adventofcode.com/2020/ | 7 | `**` | | | | 8 | | `**` | | | 9 | | `**` | | +|11 | `**` | | | `test.sh` can be used to run all solutions and automatically compares them to (my) puzzle inputs and the expected outputs. diff --git a/data/day11.expected b/data/day11.expected new file mode 100644 index 0000000..2521931 --- /dev/null +++ b/data/day11.expected @@ -0,0 +1,2 @@ +2275 +2121 diff --git a/data/day11.input b/data/day11.input new file mode 100644 index 0000000..9ac13d4 --- /dev/null +++ b/data/day11.input @@ -0,0 +1,98 @@ +LLLLLLLLL.LLLL.LLLLL.LLLLLLLLLL.LLLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLL +LLLLLLLLL.LLLL.LLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL +LLLLLLLLL.LLLL.LLLLL.LLLLLL.LLLLLLLL.LLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLL 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self, + s: str, + max_neighbour_steps: Optional[int], + occupied_neighbours_to_leave: int): + self._store = [[Tile(c) for c in line] for line in s.splitlines()] + self.num_rows = len(self._store) + self.num_cols = len(self._store[0]) + self.max_neighbour_steps = max_neighbour_steps + self.occupied_neighbours_to_leave = occupied_neighbours_to_leave + + def tiles(self) -> Iterable[Tile]: + return chain.from_iterable(self._store) + + def get(self, row: int, col: int) -> Tile: + return self._store[row][col] + + def set(self, row: int, col: int, t: Tile) -> None: + self._store[row][col] = t + + def step(self) -> bool: + new_tiles = [] + + for row in range(self.num_rows): + for col in range(self.num_cols): + num_neighbours = self.count_neighbours(row, col) + tile = self.get(row, col) + new_tile = None + if tile == Tile.FREE and num_neighbours == 0: + new_tile = Tile.OCCUPIED + elif tile == Tile.OCCUPIED and num_neighbours >= self.occupied_neighbours_to_leave: + new_tile = Tile.FREE + + if new_tile is not None: + new_tiles.append((row, col, new_tile)) + + for row, col, tile in new_tiles: + self.set(row, col, tile) + + return len(new_tiles) != 0 + + def _find_neighbour(self, row: int, col: int, direction: Tuple[int, int]) -> Optional[Tuple[int, int]]: + curr_row = row + curr_col = col + + steps = 0 + while self.max_neighbour_steps is None or steps < self.max_neighbour_steps: + curr_row += direction[0] + curr_col += direction[1] + if curr_row < 0 or curr_row >= self.num_rows: + break + if curr_col < 0 or curr_col >= self.num_cols: + break + + if self.get(curr_row, curr_col) != Tile.FLOOR: + return (curr_row, curr_col) + steps += 1 + + return None + + @cache + def _neighbour_coords(self, row: int, col: int) -> List[Tuple[int, int]]: + coords = [] + for direction in NEIGHBOURS: + neighbour = self._find_neighbour(row, col, direction) + if neighbour is not None: + coords.append(neighbour) + return coords + + def neighbours(self, row: int, col: int) -> Iterable[Tile]: + for nrow, ncol in self._neighbour_coords(row, col): + yield self.get(nrow, ncol) + + def count_neighbours(self, row: int, col: int) -> int: + return len([tile for tile in self.neighbours(row, col) if tile == Tile.OCCUPIED]) + + +def run(layout: Layout) -> int: + while layout.step(): + pass + + return len([t for t in layout.tiles() if t == Tile.OCCUPIED]) + +if __name__ == '__main__': + layout_str = sys.stdin.read() + print(run(Layout(layout_str, 1, 4))) + print(run(Layout(layout_str, None, 5)))