65 lines
1.6 KiB
Python
Executable file
65 lines
1.6 KiB
Python
Executable file
#!/usr/bin/env python
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import dataclasses
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import sys
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from typing import NamedTuple
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class Point(NamedTuple):
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x: int
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y: int
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@dataclasses.dataclass
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class Expansion:
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lines: set[int]
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rows: set[int]
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def solve(input: list[str]) -> int:
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def parse(input: list[str]) -> tuple[list[Point], Expansion]:
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res: list[Point] = []
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expansion = Expansion(set(range(len(input))), set(range(len(input[0]))))
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for x, line in enumerate(input):
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for y, c in enumerate(line):
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if c != "#":
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continue
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res.append(Point(x, y))
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expansion.lines.discard(x)
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expansion.rows.discard(y)
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return res, expansion
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def do_expansion(galaxies: list[Point], expansion: Expansion) -> list[Point]:
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new_lines = [0] * len(input)
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new_rows = [0] * len(input[0])
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for i in range(len(new_lines)):
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new_lines[i] = new_lines[i - 1] + (1000000 - 1) * (i in expansion.lines) + 1
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for i in range(len(new_rows)):
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new_rows[i] = new_rows[i - 1] + (1000000 - 1) * (i in expansion.rows) + 1
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return [Point(new_lines[p.x], new_rows[p.y]) for p in galaxies]
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def dist(a: Point, b: Point) -> int:
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return abs(a.x - b.x) + abs(a.y - b.y)
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galaxies, expansion = parse(input)
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galaxies = do_expansion(galaxies, expansion)
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return sum(
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dist(galaxies[i], galaxies[j])
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for i in range(len(galaxies))
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for j in range(i + 1, len(galaxies))
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)
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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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