Leetcode---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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Have you met this question in a real interview?

求一棵树的高度，很显然，递归，三行代码。。。

int maxDepth(TreeNode *root) {
        if(root==NULL)
            return 0;
        return max(maxDepth(root->left),maxDepth(root->right))+1;
    }