摘要： 题目描述：Problem DescriptionGiven a set of sticks of various lengths, is it possible to join them end-to-end to form a square?InputThe first line of input contains N, the number of test cases. Each test case begins with an integer 4 7 #include 8 9 int visit[20];10 bool flag;11 int number[20];12 int n,.. 阅读全文