https://www.luogu.com.cn/problem/P4197
by Zcus @ 2019-12-13 19:41:28
@[Ender_zzm](/user/33339) 很难的样子
by nkinclude @ 2019-12-13 19:42:12
还是谢谢了
by nkinclude @ 2019-12-13 19:42:18
Ynoi，请
by tiger0133 @ 2019-12-13 19:48:28
@[tiger0133](/user/28762) 云南不是信竞弱省吗
by nkinclude @ 2019-12-13 19:49:22
难道说数据结构题很难
by nkinclude @ 2019-12-13 19:50:09
@[nkinclude](/user/186182) yn是由乃吧 是一堆很难的题目
by tumu1t @ 2019-12-13 19:58:17
@[KethGeorge](/user/38832) 是这样吗
by nkinclude @ 2019-12-13 19:59:36
@[nkinclude](/user/186182) 您可以在题库搜Ynoi，注意大小写
by TEoS @ 2019-12-13 20:02:18
https://www.luogu.com.cn/problem/P4220
by newbie314159 @ 2019-12-13 20:48:21