Leetcode 404 Solution

This article provides solution to leetcode question 404 (sum-of-left-leaves)
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https://leetcode.com/problems/sum-of-left-leaves

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 {
public:
    int sumOfLeftLeaves(TreeNode* root, bool left)
    {
        if (root == NULL)
            return 0;



        if (root->left == NULL && root->right == NULL)
            return left ? root->val : 0;



        int sum = 0;
        if (root->left)
            sum += sumOfLeftLeaves(root->left, true);



        if (root->right)
            sum += sumOfLeftLeaves(root->right, false);



        return sum;
    }



    int sumOfLeftLeaves(TreeNode* root) {
        return sumOfLeftLeaves(root, false);
    }
};