摘要:"题目链接" $Description$ 求$$\sum_{i 1}^n\sum_{j=1}^nijgcd(i,j)\mod p$$ $n include include define LL long long using namespace std; const int N=7e6+7; int 阅读全文
posted @ 2019-03-18 16:38 LeTri 阅读(112) 评论(0) 推荐(0) 编辑