59 lines
1.3 KiB
Python
59 lines
1.3 KiB
Python
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#!/usr/bin/env python
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import itertools
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import sys
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from collections import Counter
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from typing import Iterable, List, NamedTuple, Tuple
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class Point(NamedTuple):
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x: int
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y: int
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Line = Tuple[Point, Point]
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def solve(input: List[str]) -> int:
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def parse_line(line: str) -> Line:
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def parse_point(point: str) -> Point:
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x, y = map(int, point.split(","))
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return Point(x, y)
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p1, p2 = map(parse_point, line.split(" -> "))
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return (p1, p2)
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def line_to_points(line: Line) -> Iterable[Point]:
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def inclusive_range_any_order(a: int, b: int) -> Iterable[int]:
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if a < b:
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yield from range(a, b + 1)
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else:
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yield from range(a, b - 1, -1)
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p1, p2 = line
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xs = inclusive_range_any_order(p1.x, p2.x)
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ys = inclusive_range_any_order(p1.y, p2.y)
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if p1.x == p2.x:
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xs = itertools.repeat(p1.x)
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if p1.y == p2.y:
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ys = itertools.repeat(p1.y)
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yield from map(Point._make, zip(xs, ys))
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lines = list(map(parse_line, input))
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counts = Counter(itertools.chain.from_iterable(line_to_points(l) for l in lines))
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return sum(counts[p] > 1 for p in counts)
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def main() -> None:
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input = [line.strip() for line in sys.stdin.readlines()]
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print(solve(input))
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if __name__ == "__main__":
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main()
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