1、题目

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.

2、代码实现

/*** Definition for a binary tree node.* public class TreeNode {*     int val;*     TreeNode left;*     TreeNode right;*     TreeNode(int x) { val = x; }* }*/
public class Solution {public int maxDepth(TreeNode root) {if (root == null) return 0;return  1 + Math.max(maxDepth(root.left), maxDepth(root.right));}
}

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