摘要: #include<bits/stdc++.h> using namespace std; const int N = 4e5 + 7; typedef long long LL; const int MOD = 1e9 + 7; LL iv[N], sum[N], a[N]; inline LL r 阅读全文
posted @ 2020-08-06 19:30 HighLights 阅读(310) 评论(0) 推荐(0)