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题目： Nowadays, there are more and more challenge game on TV such as 'Girls, Rush Ahead'. Now, you participate int a game like this. There are N rooms. 阅读全文
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题目： 国家探险队长 Jack 意外弄到了一份秦始皇的藏宝图，于是，探险队一行人便踏上寻宝之旅，去寻找传说中的宝藏。 藏宝点分布在森林的各处，每个点有一个值，表示藏宝的价值。它们之间由一些小路相连，小路不会形成环，即两个藏宝点之间有且仅有一条道路。探险队从其中的一点出发，每次他们可以留一个人在此点开 阅读全文
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题目： A tree with N nodes and N-1 edges is given. To connect or disconnect one edge, we need 1 unit of cost respectively. The nodes are labeled from 1 t 阅读全文
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题目： Bob wants to hold a race to encourage people to do sports. He has got trouble in choosing the route. There are N houses and N - 1 roads in his vil 阅读全文