编程语言:JAVA
题目描述:
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.
Note: A leaf is a node with no children.
Example:
Given binary tree [3,9,20,null,null,15,7],
3
/ \
9 20
/ \
15 7
return its depth = 3.
提交反馈:
39 / 39 test cases passed.
Status: Accepted
Runtime: 0 ms
Submitted: 0 minutes ago
You are here!
Your runtime beats 100.00 % of java submissions.
解题思路:
知道这是一道递归题目,但是就是写不出递归程序,太菜了。。。。
继续练习吧。。。。。。。。。。。。。。。。。。。。。。。。。。。
代码:
/** * 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;}
return Math.max(maxDepth(root.left), maxDepth(root.right))+1;
}
}
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