摘要: 地址:http://www.lydsy.com/JudgeOnline/problem.php?id=2818 题目: 2818: Gcd Description 给定整数N,求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对. 给定整数N,求1<=x,y<=N且Gcd(x,y)为 阅读全文
posted @ 2017-08-21 00:48 weeping 阅读(206) 评论(0) 推荐(0) 编辑