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Is It A Tree? A tree is a well-known data structure that is either empty (null, void, nothing) or is a set of one or more nodes connec... 阅读全文
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Ice_cream’s world Iice_cream’s world is a rich country, it has many fertile lands. Today, the queen of ice_cream wants award land to d... 阅读全文
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小希的迷宫上次Gardon的迷宫城堡小希玩了很久（见Problem B），现在她也想设计一个迷宫让Gardon来走。但是她设计迷宫的思路不一样，首先她认为所有的通道都应该是双向连通的，就是说如果有一个通道连通了房间A和B，那么既可以通过它从房间A走到房间B，也可以通过... 阅读全文
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More is better Mr Wang wants some boys to help him with a project. Because the project is rather complex, the more boys come, the bett... 阅读全文
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The Suspects Severe acute respiratory syndrome (SARS), an atypical pneumonia of unknown aetiology, was recognized as a global threat i... 阅读全文
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Rikka with GraphAs we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practic... 阅读全文