44 lines
916 B
Python
44 lines
916 B
Python
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#!/usr/bin/env python
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import sys
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from collections.abc import Iterator
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from typing import NamedTuple
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class Point3(NamedTuple):
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x: int
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y: int
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z: int
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@classmethod
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def from_input(cls, input: str) -> "Point3":
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x, y, z = map(int, input.split(","))
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return cls(x, y, z)
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@classmethod
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def neighbours(cls, p: "Point3") -> Iterator["Point3"]:
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for dx, dy, dz in (
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(0, 0, -1),
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(0, 0, 1),
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(0, -1, 0),
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(0, 1, 0),
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(-1, 0, 0),
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(1, 0, 0),
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):
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yield cls(p.x + dx, p.y + dy, p.z + dz)
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def solve(input: list[str]) -> int:
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cubes = {Point3.from_input(line) for line in input}
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return sum(1 for p in cubes for n in Point3.neighbours(p) if n not in cubes)
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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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