@[Juan_feng](/space/show?uid=66965) %大佬ing
by tryrtj @ 2018-10-28 19:27:13
..LCA裸题。。反正我评的是绿题。。
by CYJian @ 2018-10-28 19:28:49
@[暮雪﹃紛紛](/space/show?uid=20782) 握手qwq
by Juan_feng @ 2018-10-28 19:29:33
@[Juan_feng](/space/show?uid=66965) 握爪。。
by CYJian @ 2018-10-28 19:32:13
LCA板子 + 证明 + 树上前缀和小应用
恩绿题吗 ， 果然是我太菜了QAQ
by SuperGoodGame @ 2018-10-28 19:34:28
Orz 神犇
by 哔哩哔哩 @ 2018-10-28 19:34:37
@[SuperGoodGame](/space/show?uid=65987) 没办法，神就是可以为所欲为，像我这种蒟蒻只能打个板子了
by MDS丶R @ 2018-10-28 19:36:27
@[SuperGoodGame](/space/show?uid=65987)
我觉得那应该叫树上差分
by RiverFun @ 2018-10-28 19:46:46
@[Steve_braveman](/space/show?uid=96570) 您说什么叫树上差分？
by Juan_feng @ 2018-10-28 19:48:51
@[Steve_braveman](/space/show?uid=96570) 果然是小蒟蒻见识短浅QAQAQ
by Juan_feng @ 2018-10-28 19:49:10