44 lines
844 B
Python
44 lines
844 B
Python
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#!/usr/bin/env python
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import re
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import sys
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from dataclasses import dataclass
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from typing import List
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@dataclass
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class Policy:
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min: int
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max: int
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letter: str
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@dataclass
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class Password:
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policy: Policy
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password: str
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def is_valid(pwd: Password) -> bool:
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min = pwd.password[pwd.policy.min - 1] == pwd.policy.letter
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max = pwd.password[pwd.policy.max - 1] == pwd.policy.letter
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return min ^ max
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def solve(passwords: List[Password]) -> int:
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return sum(map(is_valid, passwords))
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def main() -> None:
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pattern = re.compile("([0-9]+)-([0-9]+) (.): (.+)")
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input = [
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Password(Policy(int(m.group(1)), int(m.group(2)), m.group(3)), m.group(4))
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for m in (pattern.match(line) for line in sys.stdin.readlines())
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if m
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]
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print(solve(input))
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if __name__ == "__main__":
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main()
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