104. Maximum Depth of Binary Tree
难度: Easy
刷题内容
原题连接
- https://leetcode.com/problems/maximum-depth-of-binary-tree
内容描述
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.
解题方案
思路 1 **- 时间复杂度: O(log2 N)*- 空间复杂度: O(N)***
- 这道题使用递归进行解决,因为对于树的每一个儿子的处理方法是一致的。
- 将左儿子和右儿子中最大的数进行返回再加上当前的深度1即可解决。
代码:
var maxDepth = function(root) {
if(root===null||root === undefined)
return 0;
return Math.max(maxDepth(root.left),maxDepth(root.right))+1;
};