摘要：
链接： https://vjudge.net/problem/POJ 2065 题意： For some years, quite a lot of work has been put into listening to electromagnetic radio signals received 阅读全文
摘要：
链接： https://vjudge.net/problem/POJ 2478 题意： The Farey Sequence Fn for any integer n with n = 2 is the set of irreducible rational numbers a/b with 0 i 阅读全文