随笔分类 - 图论_树的直径
摘要：Description Building and maintaining roads among communities in the far North is an expensive business. With this in mind, the roads are build such th
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摘要：Problem Description Claire and her little friend, ykwd, are travelling in Shevchenko's Park! The park is beautiful - but large, indeed. N feature spot
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摘要：Description After hearing about the epidemic of obesity in the USA, Farmer John wants his cows to get more exercise, so he has committed to create a b
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摘要：描述 上回说到，小Ho得到了一棵二叉树玩具，这个玩具是由小球和木棍连接起来的，而在拆拼它的过程中，小Ho发现他不仅仅可以拼凑成一棵二叉树！还可以拼凑成一棵多叉树——好吧，其实就是更为平常的树而已。 但是不管怎么说，小Ho喜爱的玩具又升级换代了，于是他更加爱不释手（其实说起来小球和木棍有什么好玩的是吧
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