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Re:该题根本不用并查集。树的性质。。附AC代码，，In Reply To:该题根本不用并查集。树的性质。。附AC代码，， Posted by:lvweihua at 2017-08-12 19:49:31 Every node except the root has exactly one edge pointing to it. 完全不管边的方向讲道理是会跪的吧。 Followed by:
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