Leet Code OJ 104. Maximum Depth of Binary Tree [Difficulty: Easy]
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.
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;}int leftnum=0;if(root.left!=null){leftnum=maxDepth(root.left);}int rightnum=0;if(root.right!=null){rightnum=maxDepth(root.right);}if(leftnum>rightnum){return leftnum+1;}else{return rightnum+1;}}
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