diff --git a/2020/d06/ex2/ex2.py b/2020/d06/ex2/ex2.py new file mode 100755 index 0000000..c78283d --- /dev/null +++ b/2020/d06/ex2/ex2.py @@ -0,0 +1,31 @@ +#!/usr/bin/env python + +import sys +from collections import defaultdict +from typing import DefaultDict, List, Set + + +def solve(raw: List[str]) -> int: + answers: DefaultDict[int, Set[str]] = defaultdict(set) + group = 0 + first = True + for line in raw: + if line == "": + group += 1 + first = True + continue + if not first: + answers[group] &= {char for char in line} + else: + answers[group] = {char for char in line} + first = False + return sum(len(answer) for answer in answers.values()) + + +def main() -> None: + input = [line.strip() for line in sys.stdin.readlines()] + print(solve(input)) + + +if __name__ == "__main__": + main()