2020 day11/python: add solution
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@ -15,5 +15,6 @@ https://adventofcode.com/2020/
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`test.sh` can be used to run all solutions and automatically compares them to (my) puzzle inputs and the expected outputs.
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`test.sh` can be used to run all solutions and automatically compares them to (my) puzzle inputs and the expected outputs.
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2020/data/day11.expected
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2020/data/day11.expected
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2020/data/day11.input
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2020/data/day11.input
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2020/day11/day11.py
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2020/day11/day11.py
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#!/usr/bin/env python
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from copy import deepcopy
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from enum import Enum, auto
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from functools import cache
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from itertools import chain
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import sys
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from typing import Iterable, List, Optional, Tuple
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NEIGHBOURS = [(dx, dy) for dy in (-1, 0, 1) for dx in (-1, 0, 1) if not dx == dy == 0]
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class Tile(Enum):
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FLOOR = '.'
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FREE = 'L'
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OCCUPIED = '#'
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class Layout:
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def __init__(
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self,
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s: str,
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max_neighbour_steps: Optional[int],
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occupied_neighbours_to_leave: int):
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self._store = [[Tile(c) for c in line] for line in s.splitlines()]
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self.num_rows = len(self._store)
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self.num_cols = len(self._store[0])
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self.max_neighbour_steps = max_neighbour_steps
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self.occupied_neighbours_to_leave = occupied_neighbours_to_leave
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def tiles(self) -> Iterable[Tile]:
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return chain.from_iterable(self._store)
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def get(self, row: int, col: int) -> Tile:
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return self._store[row][col]
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def set(self, row: int, col: int, t: Tile) -> None:
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self._store[row][col] = t
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def step(self) -> bool:
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new_tiles = []
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for row in range(self.num_rows):
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for col in range(self.num_cols):
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num_neighbours = self.count_neighbours(row, col)
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tile = self.get(row, col)
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new_tile = None
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if tile == Tile.FREE and num_neighbours == 0:
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new_tile = Tile.OCCUPIED
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elif tile == Tile.OCCUPIED and num_neighbours >= self.occupied_neighbours_to_leave:
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new_tile = Tile.FREE
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if new_tile is not None:
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new_tiles.append((row, col, new_tile))
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for row, col, tile in new_tiles:
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self.set(row, col, tile)
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return len(new_tiles) != 0
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def _find_neighbour(self, row: int, col: int, direction: Tuple[int, int]) -> Optional[Tuple[int, int]]:
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curr_row = row
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curr_col = col
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steps = 0
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while self.max_neighbour_steps is None or steps < self.max_neighbour_steps:
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curr_row += direction[0]
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curr_col += direction[1]
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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)))
|
||||||
Loading…
Reference in a new issue