TheAlgorithms-C/leetcode/src/112.c

bool hasPathSum(struct TreeNode *root, int sum)
{
    if (root == NULL)
        return 0;
    if (!root->left && !root->right && sum - root->val == 0)
        return 1;
    return hasPathSum(root->left, sum - root->val) ||
           hasPathSum(root->right, sum - root->val);
}