36 lines
826 B
Python
36 lines
826 B
Python
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#!/usr/bin/env python
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from typing import Iterator
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def is_valid_password(p: int) -> bool:
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digits = str(p)
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def has_unique_adjacent_digit():
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counts = {d: 0 for d in range(10)}
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for (a, b) in zip(digits, digits[1:]):
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if a == b:
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counts[int(a)] += 1
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return any(count == 1 for count in counts.values())
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def digits_never_decrease():
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return all(a == b for a, b in zip(sorted(digits), digits))
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return has_unique_adjacent_digit() and digits_never_decrease()
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def compute_pass(begin: int, end: int) -> Iterator[int]:
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for p in range(begin, end + 1):
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if is_valid_password(p):
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yield p
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def main() -> None:
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begin = 264793
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end = 803935
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print(sum(1 for p in compute_pass(begin, end)))
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if __name__ == "__main__":
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main()
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