@[此店不售此书](/space/show?uid=103434) ~~来做做[这道题](https://www.luogu.org/problemnew/show/SP26045)你就知道如何卡常数了~~
by _louhc @ 2019-04-14 22:03:02
@[此店不售此书](/space/show?uid=103434) [切切此题](https://www.luogu.org/problemnew/show/P4604)
by Shikita @ 2019-04-14 22:13:13