zhaobo123 @ 2019-05-29 19:56:36
这题与线段树有毛关系阿
by t162 @ 2019-05-29 19:57:18
怎么就没关系了?
by lukelin @ 2019-05-29 20:00:21
ORZ,大佬\Theta(1)数学求解
by NaCly_Fish @ 2019-05-29 20:48:46
是因为可以用主席树搞吧
by algobase @ 2020-05-14 13:20:34
捉鰰