Leetcode 404 Solution

This article provides solution to leetcode question 404 (sum-of-left-leaves)
Categories:
Tags:
Access this page by simply typing in "lcs 404" in your browser address bar if you have bunnylol configured.

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);
    }
};