摘要：
The Unique MSTTime Limit: 1000MS Memory Limit: 10000KTotal Submissions: 34254 Accepted: 12473DescriptionGiven a connected undirected g... 阅读全文
摘要：
Given a positive integer x, let S(x) denotes the sum of all x's digits. Two integers x and y are friend numbers if S(x)=S(y). Here com... 阅读全文