LeetCode 104. 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.

 

分析:

这道题要求二叉树的最大深度,那么考虑递归实现,求左右分支中较大的那个深度,然后加上1(即root这一层)即可。

/**
 * Definition for a binary tree node.
 * function TreeNode(val) {
 *     this.val = val;
 *     this.left = this.right = null;
 * }
 */
/**
 * @param {TreeNode} root
 * @return {number}
 */
var maxDepth = function(root) {
    if(!root) {
        return 0;
    }
    return Math.max(maxDepth(root.left),maxDepth(root.right)) + 1;
};

 

posted @ 2017-04-02 18:22  一片叶子啊  阅读(91)  评论(0编辑  收藏  举报