// rotates right child to right ,then current to left
public AVLTreeNode <T> RotateRightLeft(AVLTreeNode <T> root)
{
root.right = RotateLeftLeft(root.right);
return(RotateRightRight(root));
}
// public insert, calls private insert on given item
public void Insert(T value)
{
root = Insert(root, value);
}
// public delete, calls private delete on given item
public void Delete(T item)
{
root = Delete(item, root);
}