advent-of-code/2021/d01/ex2/ex2.py

31 lines
666 B
Python
Raw Normal View History

2021-12-01 10:43:55 +01:00
#!/usr/bin/env python
import collections
import itertools
import sys
from typing import List
def sliding_window(iterable, n):
it = iter(iterable)
window = collections.deque(itertools.islice(it, n), maxlen=n)
if len(window) == n:
yield tuple(window)
for x in it:
window.append(x)
yield tuple(window)
def solve(input: List[int]) -> int:
windowed = [sum(window) for window in sliding_window(input, 3)]
return sum(prev < cur for (prev, cur) in zip(windowed, windowed[1:]))
def main() -> None:
input = [int(line) for line in sys.stdin.readlines()]
print(solve(input))
if __name__ == "__main__":
main()