Daiwa Securities Co. Ltd. Programming Contest 2022 Autumn (AtCoder Beginner Contest 277) A~C题详细讲解A - ^{-1}B - Playing Cards ValidationC - Ladder Takahashi
【精品题解】这次C题难得太突然，搞得博主有点手足无措，最后Rating掉了1分……（博主很菜）赛时AC：A,B,C。好，不说废话，直接上题解。
