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平衡树加启发式合并也有不错的表现。O(nlognlogn)，157ms。

Posted by Necs at 2014-10-07 03:26:58 on Problem 1741 
最近发现启发式合并可以解很多这样树上路径的问题。
有兴趣可以移步这里。
http://blog.csdn.net/asdfgh0308/article/details/39845489
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