摘要: FFT后减去重复选取的方案数。#include#include#includeusing namespace std;typedef long long ll;const int N=131072;int n,i,m,k;ll ans[N],sum[N],f1[N],f2[N];struct com... 阅读全文
posted @ 2014-11-24 18:19 Claris 阅读(408) 评论(0) 推荐(0) 编辑