[LeetCode] Maximum Depth of Binary Tree dfs,深度搜索

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

 

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　　简单的深度搜索

#include <iostream>
using namespace std;
/**
 * Definition for binary tree
 */
struct TreeNode {
    int val;
    TreeNode *left;
    TreeNode *right;
    TreeNode(int x) : val(x), left(NULL), right(NULL) {}
};

class Solution {
public:
    int maxRet;
    int maxDepth(TreeNode *root) {
        maxRet=0;
        int curDep=1;
        help_f(root,curDep);
        return maxRet;
    }
    void help_f(TreeNode * root,int &curDep)
    {
        if(root==NULL)  return ;
        curDep++;
        help_f(root->left,curDep);
        help_f(root->right,curDep);
        curDep--;
        if(root->left==NULL&&root->right==NULL){
            if(maxRet<curDep)
                maxRet=curDep;
        }
    }
};

int main()
{
    return 0;
}