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只有一棵树。。

Posted by scau201525060111 at 2016-10-31 20:37:59 on Problem 2486
In Reply To:Re:可能不是一棵树, 多个父节点... Posted by:twoone at 2016-10-04 16:40:07
本来就是无根树,要自己以1号为根重新建树

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