Leetcode 113 Solution

This article provides solution to leetcode question 113 (path-sum-ii)
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https://leetcode.com/problems/path-sum-ii

Solution

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
    vector<vector<int>> m_res;

public:
    void pathSum(TreeNode* root, int sum, vector<int>& a, int curr) {
        if (root == NULL)
            return;

        a.push_back(root->val);

        if (root->left || root->right)
        {
            pathSum(root->left, sum, a, curr + root->val);
            pathSum(root->right, sum, a, curr + root->val);
        }
        else if (curr + root->val == sum)
        {
            m_res.push_back(a);
        }

        a.pop_back();
    }

    vector<vector<int>> pathSum(TreeNode* root, int sum) {
        vector<int> a;

        pathSum(root, sum, a, 0);

        return m_res;
    }
};