Leetcode-path Sum

Source: Internet
Author: User

Path SumTotal Accepted: 31405 Total Submissions: 104326 My SubmissionsQuestionSolution

Given a binary tree and a sum, determine if the tree has a root-to-leaf path such this adding up all the values along the Path equals the given sum.

For example:
Given the below binary tree and sum = 22,
              5             /             4   8           /   /           /  4         /  \              7    2      1

Return true, as there exist a root-to-leaf path 5->4->11->2 which sum is 22.

Show TagsHas you met this question in a real interview?Yes No

Discuss


/** * Definition for binary tree * struct TreeNode {*     int val; *     TreeNode *left; *     TreeNode *right; *     Tre Enode (int x): Val (x), left (null), right (NULL) {} *}; */class Solution {public:    int flag=0;    BOOL Haspathsum (TreeNode *root, int sum) {        if (root==null) return false;                Pathsum (root,0,sum);                if (flag==1)            return true;        else            return false;            }        int Pathsum (TreeNode *root,int res,int sum)    {        if (root==null)  return 0;                res+=root->val;                int l=pathsum (root->left,res,sum);        int r=pathsum (root->right,res,sum);                if ((l+r) ==0&&res==sum)        {            flag=1;        }}            };


Leetcode-path Sum

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.