摘要: #define mod 998244353 struct modint{ unsigned int x; modint(int o=0){x=o;} modint &operator = (int o){return x=o,*this;} modint &operator +=(modint o) 阅读全文
posted @ 2020-10-31 18:35 Rainbow_qwq 阅读(1021) 评论(0) 推荐(1) 编辑