摘要：
题目链接：http://poj.org/problem?id=2478 Description The Farey Sequence Fn for any integer n with n >= 2 is the set of irreducible rational numbers a/b wit 阅读全文
摘要：
题目链接：http://acm.csu.edu.cn/csuoj/problemset/problem?pid=2021 Description Everybody loves big numbers (if you do not, you might want to stop reading at 阅读全文