摘要:
题目链接 Description A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be sup 阅读全文
摘要:
题目链接 Problem Description There are n houses in the village and some bidirectional roads connecting them. Every day peole always like to ask like this 阅读全文
摘要:
题目连接 Problem There is a tree with n nodes. For each node, there is an integer value ai, (1≤ai≤1,000,000,000 for 1≤i≤n). There is q queries which are 阅读全文