【Leetcode-easy-104】Maximum Depth of Binary Tree

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.

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思路

两种方法

• 递归
• 层次遍历

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程序

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

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声明：题目来自Leetcode。