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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.

 

解题方法是使用递归,最大深度就是 左子树的最大深度 与 右子树最大深度 的最大值+1。

 1 /** 2  * Definition for binary tree 3  * public class TreeNode { 4  *     int val; 5  *     TreeNode left; 6  *     TreeNode right; 7  *     TreeNode(int x) { val = x; } 8  * } 9  */10 public class Solution {11     public int maxDepth(TreeNode root) {12              if (root==null) {13                 return 0;14             }15              if (root.left==null && root.right==null) {16                 return 1;17             }18              return 1+Math.max(maxDepth(root.left), maxDepth(root.right));19     }20 }

 

LeetCode Maximum Depth of Binary Tree