[@chen_zhe](https://www.luogu.org/space/show?uid=8457)
by CKnight @ 2018-07-03 20:27:09
卡卡也能过，有效的利用空间吧
by feng_chengjie @ 2018-07-03 20:27:25
@[CKnight](/space/show?uid=35387) fixed
by memset0 @ 2019-01-29 20:34:50