advent-of-code/2019/d04/ex1/ex1.py

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2019-12-08 20:07:14 +01:00
#!/usr/bin/env python
from typing import Iterator
def is_valid_password(p: int) -> bool:
digits = str(p)
def has_adjacent_digit():
for (a, b) in zip(digits, digits[1:]):
if a == b:
return True
return False
def digits_never_decrease():
return all(a == b for a, b in zip(sorted(digits), digits))
return has_adjacent_digit() and digits_never_decrease()
def compute_pass(begin: int, end: int) -> Iterator[int]:
for p in range(begin, end + 1):
if is_valid_password(p):
yield p
def main() -> None:
begin = 264793
end = 803935
print(sum(1 for p in compute_pass(begin, end)))
if __name__ == "__main__":
main()