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ABC328Dを解いた【stack】

Posted at

筆者はレート800前後の茶~緑コーダ

ABC当日にACできなかった問題を解いていく

ABCの問題を解いていく

実装コード

スタックを使う問題らしい

文字列を順番に配列積んで行き
末尾がABCになったらpopして除去

main.py
from bisect import bisect_left, bisect_right, insort_left, insort_right
from collections import defaultdict, Counter, deque
from functools import reduce, lru_cache
from itertools import product, accumulate, groupby, combinations
import sys
import os
def rI(): return int(sys.stdin.readline().rstrip())
def rLI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def rI1(): return (int(sys.stdin.readline().rstrip())-1)
def rLI1(): return list(map(lambda a:int(a)-1,sys.stdin.readline().rstrip().split()))
def rS(): return sys.stdin.readline().rstrip()
def rLS(): return list(sys.stdin.readline().rstrip().split())
IS_LOCAL = int(os.getenv("ATCODER", "0"))==0
err = (lambda *args, **kwargs: print(*args, **kwargs, file=sys.stderr)) if IS_LOCAL else (lambda *args, **kwargs: None)

def main():
    S = rS()
    
    ans = []
    for s in S:
        ans.append(s)
        if len(ans) >= 3:
            if ans[-3:]==["A","B","C"]:
                for _ in range(3):
                    ans.pop()
    print("".join(ans))
    
if __name__ == '__main__':
    main()

感想

やりたい処理は一見複雑そうに見えたけどスタックをスタックを使えば瞬殺なのは驚き

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