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The Department of National Defence (DND) wishes to connect several northern outposts by a wireless network. Two different communication technologies a 阅读全文
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You are a member of the space station engineering team, and are assigned a task in the construction process of the station. You are expected to write 阅读全文
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There are N (2<=N<=600) cities,each has a value of happiness,we consider two cities A and B whose value of happiness are VA and VB,if VA is a prime nu 阅读全文
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The Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extra roads between villages some years ag 阅读全文
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Given an undirected weighted graph G, you should find one of spanning trees specified as follows. The graph G is an ordered pair (V, E), where V is a 阅读全文
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ice_cream’s world becomes stronger and stronger; every road is built as undirected. The queen enjoys traveling around her world; the queen’s requireme 阅读全文
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The island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has no public highways. So the traffic is difficult in Flatopia. The Flatopia 阅读全文