https://pintia.cn/problem-sets/1112639514090356736/problems/1112639623511359511 这道题貌似是用...
发简信
IP属地：北京
-
-
2019 BUPT Spring Group Training #3
这次的题来自2017ECNA Regional Contest，难度还行吧毕竟连我都可以A两三道。链接在此https://vjudge.net/contest/292809#...