@[Prean](/user/160839) 这是什么做法啊
by LawrenceSivan @ 2021-10-20 08:50:46
@[LawrenceSivan](/user/375208) 直接看我代码[link](https://www.luogu.com.cn/record/60366573)
by Prean @ 2021-10-20 08:51:57
@[Prean](/user/160839) [？我就用的vector](https://www.luogu.com.cn/record/59740234)
by 滑蒻稽 @ 2021-10-20 11:02:50
@[滑蒻稽](/user/113181) 都说了我用的维护前缀后缀积。。。/qd
by Prean @ 2021-10-20 11:09:26