摘要：
题面 传送门:http://codeforces.com/problemset/problem/515/C Drazil is playing a math game with Varda. Let’s define f(x)f(x)for positive integer x as a produ 阅读全文
摘要：
题面:传送门:http://codeforces.com/problemset/problem/475/D Given a sequence of integers a1, …, an and q queries x1, …, xq on it. For e... 阅读全文