这题有一点像之前做过的longest path题的变形。
使用一个Global Variable 来track longest among tree.
比较Tricky的是ans = Math.max(ans, arrLeft+arrRight);
和return Math.max(arrowLeft, arrowRight)
longest seen so far 存在ans里，我们还是要返回一个arrowLeft or arrowRight so that its parent node
might be able to merge it to get a even longer path.
题目地址 https://leetcode.com/problems/longest-univalue-path/...
这题有一点像之前做过的longest path题的变形。 使用一个Global Variable 来track l...
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本文标题：Longest Univalue path
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