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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这个题剑指offer里也有，简单的递归即可，代码很清晰：

class Solution {public:int maxDepth(TreeNode *root) {if (root == NULL){return 0;}else{int a = maxDepth(root->left) + 1;int b = maxDepth(root->right) + 1;if (a > b){return a;} else{return b;}}}private://static int depth;};