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.

https://oj.leetcode.com/problems/maximum-depth-of-binary-tree/

思路：递归求解。

public class Solution {    public int maxDepth(TreeNode root) {        if (root == null)            return 0;        return Math.max(maxDepth(root.left), maxDepth(root.right)) + 1;    }}

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