线段树错了吧,,,
这题不要线段树啊
by star_magic_young @ 2018-06-08 15:14:55
@[star_magic_young](/space/show?uid=38372) 标签就是线段树啊
by Inochi @ 2018-06-08 15:32:41
,,,前缀和随便氵
by star_magic_young @ 2018-06-08 16:00:02