王小平

题目链接 Problem Description In the new year party, everybody will get a “special present”.Now it’s your turn to get your special present, a lot of presents now putting on the desk, and only one of them...

题目链接 When Masha came to math classes today, she saw two integer sequences of length n−1 on the blackboard. Let’s denote the elements of the first sequence as ai (0≤ai≤3), and the elements of the secon...