摘要: #include #include #include #include #include using namespace std; const int MAXN = 202020; const int MOD = 1000000007; const int REV2 = (MOD + 1) / 2; const int REV6 = (MOD + 1) / 6; inline int ... 阅读全文
posted @ 2018-04-28 11:35 探险家Mr.H 阅读(290) 评论(0) 推荐(0) 编辑