I wish I could have some tree characteristics: no matter what the years bring to it all the same calm strong and selfless.

我希望我能够具备一些树的特质：无论岁月带给它什么，都一样的从容坚强无私。

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For a undirected graph with tree characteristics, we can choose any node as the root.

对于一棵无向树，我们可以选择它的任意节点作为根。

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For a undirected graph with tree characteristics, we can choose any node as the root.

对于一棵无向树，我们可以选择它的任意节点作为根。

youdao