33 lines
666 B
Python
33 lines
666 B
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 typing import List
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def find_invalid(nums: List[int]) -> int:
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for i in range(25, len(nums)):
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num = nums[i]
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found = False
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for lhs, rhs in itertools.combinations(nums[i - 25 : i], 2):
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if lhs + rhs == num:
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found = True
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break
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if not found:
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return num
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assert False # Sanity check
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def solve(raw: List[str]) -> int:
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return find_invalid([int(line) for line in raw])
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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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