摘要:
Distance Queries Time Limit: 2000MS Memory Limit: 30000K Total Submissions: 13987 Accepted: 4924 Case Time Limit: 1000MS Description Farmer John's cow 阅读全文
摘要:
There are n houses in the village and some bidirectional roads connecting them. Every day peole always like to ask like this "How far is it if I want 阅读全文