Codeforces Round 886 (Div. 4) 全题题解

a56爆大奖在线娱乐关注的人中正式参与**比赛排名公示**： | # | Who | = | Penalty | * | [A](https://codeforces.com/contest/1850/problem/A) | [B](https://codeforces.com/contest/1850/probl