69 lines
1.7 KiB
Python
Executable file
69 lines
1.7 KiB
Python
Executable file
#!/usr/bin/env python
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import itertools
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import sys
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from enum import StrEnum
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from typing import NamedTuple, Optional
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class Cell(StrEnum):
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ROLLER = "O"
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CUBE = "#"
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EMPTY = "."
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class Map(NamedTuple):
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rocks: tuple[tuple[Optional[Cell], ...], ...]
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lines: int
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rows: int
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def tilt_north(self) -> "Map":
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rocks = [[Cell.EMPTY for _ in range(self.rows)] for _ in range(self.lines)]
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for y in range(self.rows):
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rolling_stop = -1
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for x in range(self.lines):
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# Nothing to do on empty cell
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if self.rocks[x][y] == Cell.EMPTY:
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continue
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# Record the new stop point on cubes
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if self.rocks[x][y] == Cell.CUBE:
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rolling_stop = x
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rocks[x][y] = Cell.CUBE
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continue
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# For rollers, roll it up to the `last_cube`
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rocks[rolling_stop + 1][y] = Cell.ROLLER
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rolling_stop += 1
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return Map(tuple(map(tuple, rocks)), self.lines, self.rows)
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def load(self) -> int:
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res = 0
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for x, y in itertools.product(range(self.lines), range(self.rows)):
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if self.rocks[x][y] != Cell.ROLLER:
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continue
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res += self.lines - x
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return res
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def solve(input: list[str]) -> int:
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def parse(input: list[str]) -> Map:
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rocks = tuple(tuple(Cell(c) for c in line) for line in input)
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return Map(rocks, len(input), len(input[0]))
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map = parse(input)
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map = map.tilt_north()
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return map.load()
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def main() -> None:
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input = sys.stdin.read().splitlines()
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print(solve(input))
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if __name__ == "__main__":
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main()
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