2020 Multi-University Training Contest 6 - 1007. A Very Easy Math Problem(莫比乌斯反演)
摘要:
题目链接:A Very Easy Math Problem 题意:给你一个T,x,k,表示有T次询问,每次询问给你一个n,求: $$\sum_{a_1=1}^{n}\sum_{a_2=1}^{n}\ldots \sum_{a_x=1}^{n}\left (\prod_{j=1}^{x}a_j^k\r 阅读全文
posted @ 2020-08-07 08:40 啊啊鄂 阅读(208) 评论(0) 推荐(0) 编辑