摘要: 题意: Count the number of distinct sequences a1, a2, ..., an (1 ≤ ai) consisting of positive integers such that gcd(a1, a2, ..., an) = xand . As this nu 阅读全文
posted @ 2020-02-20 16:08 aaaaaaaaaaaaaa123 阅读(159) 评论(0) 推荐(0)