@[Froggy](/space/show?uid=100285) 我前几天刚好刷过这道题
by Kubic @ 2019-03-15 20:30:06
@[Froggy](/space/show?uid=100285) 但我用的是$FHQ$ $Treap$
by Kubic @ 2019-03-15 20:30:39
管理楼下()
by guyushikunkun @ 2023-07-19 22:54:29