fork download

copy

// Following is the Binary Tree node structure
/**************
class BinaryTreeNode {
    public : 
    T data;
    BinaryTreeNode<T> *left;
    BinaryTreeNode<T> *right;
 
    BinaryTreeNode(T data) {
        this -> data = data;
        left = NULL;
        right = NULL;
    }
};
***************/
int sum = 0;
int leftSum(BinaryTreeNode<int>* root){
    // Write your code here
 
    if(root == NULL){
        return 0;
    }
    if(root->left == NULL){
        sum+=root->left->data;
    }
	sum+=leftSum(root->left);
    sum+=leftSum(root->right);
    return sum;
}
 

prog.cpp:17:13: error: ‘BinaryTreeNode’ was not declared in this scope
 int leftSum(BinaryTreeNode<int>* root){
             ^~~~~~~~~~~~~~
prog.cpp:17:28: error: expected primary-expression before ‘int’
 int leftSum(BinaryTreeNode<int>* root){
                            ^~~

Standard output is empty