@[Decoration](/space/show?uid=48265) 为啥要写树套树啊。。
by 星小雨 @ 2018-10-17 21:37:15
主席树大法好
by yzhang @ 2018-10-17 21:45:34
@[星小雨](/space/show?uid=20435) 因为不会CDQ，行了吧QAQ
by decoqwq @ 2018-10-17 21:57:51
@[yzhang](/space/show?uid=37881) orz
by decoqwq @ 2018-10-17 21:57:58
qaq，~~卡常大法哪家强，OI卡常找南翔~~
by yzhang @ 2018-10-17 21:59:50
你常数也太大了吧
by wjy666 @ 2018-12-13 19:26:38