浪费时间，用啥树剖
by 1saunoya @ 2020-04-29 21:55:53
@[Isaunoya](/user/96580) 刚学树剖，练习一下。
by yu__xuan @ 2020-04-29 21:56:22
@[树链剖分](/user/110669) (
by atarashiTLE @ 2020-04-29 21:57:50
树剖……，这题dfs O（n）就可以鸭
by 无尽星空 @ 2020-04-29 22:10:42
练一下树剖嘛
by yu__xuan @ 2020-04-29 22:14:14
为什么要用线段树啊
@[yu__xuan](/user/142110)
by K2sen @ 2020-04-30 05:58:22
@[yu__xuan](/user/142110) [练树剖写啥不行非得写一眼题](https://www.luogu.com.cn/training/1654#information)
by xwmwr @ 2020-04-30 06:07:07
我来帮你封贴
by K2sen @ 2020-04-30 06:17:53
@[_Destiny](/user/188155) %%%
by yu__xuan @ 2020-04-30 06:20:10
大材小用了
by Suuon_Kanderu @ 2020-06-07 12:39:53