摘要: #include<bits/stdc++.h> #define ll long long using namespace std; const int mx=2e6; const int mod=1e9+7; int n,m; ll res,fac[mx+5],inv[mx+5]; //相同的字符 阅读全文
posted @ 2021-07-22 09:26 仰望星空的蚂蚁 阅读(11) 评论(0) 推荐(0)