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Problem DescriptionIn 2100, since the sea level rise, most of the cities disappear. Though some survived cities are still connected with others, but m... 阅读全文
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Problem DescriptionThere are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to e... 阅读全文
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Problem DescriptionMr Wang wants some boys to help him with a project. Because the project is rather complex,the more boys come, the better it will be... 阅读全文
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Problem DescriptionA 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 dire... 阅读全文