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Re:可能不是一棵树， 多个父节点...In Reply To:可能不是一棵树， 多个父节点... Posted by:NJUT1401140226 at 2016-09-16 11:53:30 我感觉也应该不是一棵树，建成有向树的话是WA，建成无向树则是AC，有知道的大神麻烦给解释一下。 Followed by:
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