摘要：Flip Game Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 59468 Accepted: 24750 Description Flip game is played on a rectangular 4x4 field 阅读全文

摘要：食物链 Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 113794 Accepted: 34597 Description 动物王国中有三类动物A,B,C，这三类动物的食物链构成了有趣的环形。A吃B， B吃C，C吃A。 现有N个 阅读全文

摘要：Anton has a positive integer nn, however, it quite looks like a mess, so he wants to make it beautiful after kk swaps of digits. Let the decimal repre 阅读全文

摘要：You still have partial information about the score during the historic football match. You are given a set of pairs (ai,bi)(ai,bi), indicating that at 阅读全文