http://acm.hdu.edu.cn/showproblem.php?pid=1286 找新朋友 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 8694 Accepted Submission(s): 4592 Problem Description 新年快到了,“猪头帮协会”准备搞一个聚会,已经知道现有会员N人,把会员从1到N编号,其…