62 lines
1.5 KiB
Python
62 lines
1.5 KiB
Python
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#!/usr/bin/env python
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import dataclasses
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import functools
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import operator
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import sys
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from collections import Counter
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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 Robot:
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pos: Point
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vel: Point
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def step(self, dims: Point, delta: int = 1) -> "Robot":
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x, y = self.pos.x + self.vel.x * delta, self.pos.y + self.vel.y * delta
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return Robot(
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Point(x % dims.x, y % dims.y),
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self.vel,
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)
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def solve(input: str) -> int:
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def parse_robot(input: str) -> Robot:
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pos, vel = map(lambda s: s.split("=")[1], input.split(" "))
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return Robot(
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Point(*map(int, pos.split(","))),
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Point(*map(int, vel.split(","))),
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)
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def parse(input: list[str]) -> list[Robot]:
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return [parse_robot(line) for line in input]
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def compute_safety(robots: list[Robot], dims: Point) -> int:
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mid_x, mid_y = dims.x // 2, dims.y // 2
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counts: Counter[tuple[bool, bool]] = Counter()
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for x, y in map(lambda robot: robot.pos, robots):
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if x == mid_x or y == mid_y:
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continue
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counts[(x < mid_x, y < mid_y)] += 1
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return functools.reduce(operator.mul, counts.values())
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robots = parse(input.splitlines())
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dims = Point(101, 103)
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robots = [robot.step(dims, 100) for robot in robots]
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return compute_safety(robots, dims)
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def main() -> None:
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input = sys.stdin.read()
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print(solve(input))
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if __name__ == "__main__":
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main()
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