摘要: 题目链接 Problem Description Multiple query, for each n, you need to get $$$$$$ \sum_{i=1}^{n} \sum_{j=1}^{i-1}{ [gcd(i + j, i - j) = 1]} $$$$$$ Input On 阅读全文
posted @ 2018-08-22 19:37 会打表的toby 阅读(716) 评论(0) 推荐(1) 编辑