HackerRank - Tree - Tree Top view

TreeTopView.cpp

/*
struct node
{
    int data;
    node* left;
    node* right;
};

*/
void top_viewL(node* root)
{
    if(root==NULL)   
        return; 
    top_viewL(root->left); 
    printf("%d ", root->data);
}

void top_viewR(node* root)
{
    if(root==NULL)    
        return;
    printf("%d ", root->data);
    top_viewR(root->right);      
}

void top_view(node * root)
{
    if(root==NULL)
        return; 
    top_viewL(root->left); 
    printf("%d ", root->data); 
    top_viewR(root->right); 
  
}