/*
knakul853
*/
void goleft(node* root){

    if(root == NULL) return;
        goleft(root->left);
    cout<<root->data<<" ";
}
void goright(node * root){

    if(root == NULL){

    return;
    }
    cout<<root->data<<" ";
    goright(root->right);
}
void topView(node * root) {
 node * p =root;
    node * q =root;
    if(root==NULL)return;
    if(p->left != NULL){

        goleft(p->left);
    }
    cout<<root->data<<" ";
    if(q->right != NULL)
    goright(q->right);

}