LeetCode 543. Diameter of Binary Tree

Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of the longest path between any two nodes in a tree. This path may or may not pass through the root.

Example:
Given a binary tree
1
/ \
2 3
/ \
4 5
Return 3, which is the length of the path [4,2,1,3] or [5,2,1,3].

Note: The length of path between two nodes is represented by the number of edges between them.

题目大意:给一个二叉树,计算出任意两个节点中最长的长度并返回结果~

分析:计算每个节点的深度,并在dfs过程中将每个节点左边深度+右边深度的值的最大的值保存在ans中返回~

 

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