LeetCode-Solutions/112.path-sum.cpp at main · dec0deit/LeetCode-Solutions · GitHub

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/*
 * @lc app=leetcode id=112 lang=cpp
 *
 * [112] Path Sum
 */

// @lc code=start
/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 * };
 */
class Solution {
public:
    bool hasPathSum(TreeNode* root, int targetSum) {
        if(root == nullptr){
            return false;
        }

        if(root->left == nullptr && root->right == nullptr){
            if(targetSum == root->val){
                return true;
            }
            return false;
        }

        bool ans = hasPathSum(root->left,targetSum-root->val) || hasPathSum(root->right,targetSum-root->val);

        return ans;
    }
};
// @lc code=end