Problem:
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.
Solution:
/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* struct TreeNode *left;
* struct TreeNode *right;
* };
*/
int maxDepth(struct TreeNode* root) {
int left_depth,right_depth;
if(root == NULL)
return 0;
left_depth = maxDepth(root->left);
right_depth= maxDepth(root->right);
return (left_depth>right_depth)?left_depth+1:right_depth+1;
}
104. Maximum Depth of Binary Tree
原文：http://www.cnblogs.com/liutianyi10/p/5521210.html