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来源poj1236 A number of schools are connected to a computer network. Agreements have been developed among those schools: each school maintains a list of 阅读全文
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来源poj1860 everal currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and perform 阅读全文
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来源poj1797 Background Hugo Heavy is happy. After the breakdown of the Cargolifter project he can now expand business. But he needs a clever man who tel 阅读全文
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来源poj2236 An earthquake takes place in Southeast Asia. The ACM (Asia Cooperated Medical team) have set up a wireless network with the lap computers, b 阅读全文
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来源 hdu 1325 A tree is a well known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connected by directed ed 阅读全文