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[leetcode]Maximum Depth of Binary Tree

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. 

算法思路:

递归。没啥说的,常规题。

 1 public class Solution { 2     public int maxDepth(TreeNode root) { 3         if(root == null) return 0; 4         if(root.left == null && root.right == null) return 1; 5         int left = 0,right = 0; 6         left = maxDepth(root.left); 7         right = maxDepth(root.right); 8         return Math.max(left,right) + 1; 9     }10 }