[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.

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Tree Depth-first Search

没啥说的,深度优先搜索(Depth-first Search),直接在网站上敲代码,一遍AC。

 * Definition for binary tree
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
class Solution {
    int DFS(TreeNode * root, int depth){
        if(root == NULL){
            return depth;
            return max(DFS(root->left, depth + 1), DFS(root->right, depth + 1));
    int maxDepth(TreeNode *root) {
         return DFS(root, 0);  


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