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问题描述 Just in case somebody missed it: we have wonderful girls in Arpa’s land. Arpa has a rooted tree (connected acyclic graph) consisting of n vertice 阅读全文
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问题描述 There is going to be a voting at FIPA (Fédération Internationale de Programmation Association) to determine the host of the next IPWC (Internatio 阅读全文
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问题描述 Bob enjoys playing computer games, especially strategic games, but sometimes he cannot find the solution fast enough and then he is very sad. Now 阅读全文