Maximum Depth of Binary Tree

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.

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给定一个二叉树，找出其最大深度。 
二叉树的深度为根节点到最远叶子节点的距离。

如果二叉树为空，则深度为0 
如果不为空，分别求左子树的深度和右子树的深度，去最大的再加1，因为根节点深度是1，要加进去。

/*** Definition for a binary tree node.* 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 (NULL == root)return 0;int l = maxDepth(root->left);int r = maxDepth(root->right);return l > r ? l + 1:r+1;} };/*** Definition for a binary tree node.* struct TreeNode {* int val;* TreeNode *left;* TreeNode *right;* TreeNode(int x) : val(x), left(NULL), right(NULL) {}* };*/ class Solution { public:int height(TreeNode* root) { if(root==NULL) return 0; else{ int l=height(root->left); int r=height(root->right); return 1+((l>r)?l:r); } } int maxDepth(TreeNode* root) {if (NULL == root)return 0;int l = height(root->left);int r = height(root->right);return l > r ? l + 1:r+1;} };

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