@[StudyingFather](/space/show?uid=22030) 2420根本用不着LCA啊，用了LCA反而复杂了
by RiverFun @ 2019-02-16 07:26:56
@[emm···](/space/show?uid=126666) 试试搜索标签看看
by Yoo_ @ 2019-02-16 07:42:41
[SDOI2015]寻宝游戏
https://www.luogu.org/problemnew/show/P3320
这是LCA一种比较新颖的用法
by xzyxzy @ 2019-02-16 07:44:08
@[Steve_braveman](/space/show?uid=96570) emm树剖的过程也可以看做lca啊（huaji
by Juan_feng @ 2019-02-16 07:55:13
@[Alaraph](/space/show?uid=55804) 我是用tarjan求lca然后暴力跑的中点qwq
by superMB @ 2019-02-16 08:05:28
@[superMB](/space/show?uid=118265) 根据异或的开关性，维护一个树上前缀和就行了
by xiangling @ 2019-02-16 12:15:54
跑的飞快
by xiangling @ 2019-02-16 12:16:34
@[Alaraph](/space/show?uid=55804) 蛤，我说的CF519E
by superMB @ 2019-02-16 15:11:59
@[superMB](/space/show?uid=118265) 哦，我以为异或的那个......
by xiangling @ 2019-02-16 17:51:08