摘要: ``` #include using namespace std; typedef long long ll; const ll mod = 1e9+7; const int N = 1e6+5; int n; ll siz[N]; ll d[2][25][25],pow2[25],pow3[25]; void ycl(){ int o=0; pow2[0] = pow3[0] =... 阅读全文
posted @ 2019-06-04 20:20 Greenty 阅读(260) 评论(0) 推荐(0) 编辑