摘要: 1 #include <bits/stdc++.h> 2 3 using namespace std; 4 typedef long long ll; 5 const int N=3030; 6 ll a[N],pre[N],ans[N],inv3; 7 const ll mod=998244353 阅读全文
posted @ 2019-07-24 18:53 Snow_in_winer 阅读(193) 评论(0) 推荐(0) 编辑