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Maximum Depth of Binary Tree 二叉树的最大深度

Given a binary tree, find its maximum depth.

The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

 

求二叉树的最大深度问题用到深度优先搜索DFS,递归的完美应用,跟求二叉树的最小深度问题原理相同。代码如下:

 

/** * Definition for binary tree * struct TreeNode { *     int val; *     TreeNode *left; *     TreeNode *right; *     TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */class Solution {public:    int maxDepth(TreeNode *root) {        if (root == NULL) return 0;        if (root->left == NULL && root->right == NULL) return 1;        if (root->left == NULL) return 1 + maxDepth(root->right);        else if (root->right == NULL) return 1 + maxDepth(root->left);        else return 1 + max(maxDepth(root->left), maxDepth(root->right));    }};

 

求二叉树的最小深度可以参见我的博文:

http://www.cnblogs.com/grandyang/p/4042168.html

 

Maximum Depth of Binary Tree 二叉树的最大深度