摘要: #include<bits/stdc++.h> typedef long long ll; using namespace std; const int maxn = 2e6+50; ll fac[maxn]; ll inv[maxn]; const int mod = 1e9+7; ll qpow 阅读全文
posted @ 2020-07-02 15:23 特立独行的猪猪 阅读(208) 评论(0) 推荐(0) 编辑