摘要：
Problem DescriptionXY is playing a game:there are N pillar in a row,which numbered from 1 to n.Each pillar has a jewel.Now XY is standing on the S-th ... 阅读全文
摘要：
Problem DescriptionThere are n numbers A1,A2....An{A}_{1},{A}_{2}....{A}_{n}A1,A2....An,your task is to check whether there exists there diff... 阅读全文