static void Main(string[] args)
{
BalancedTree <int> tree = new BalancedTree <int>();
List <int> insertList = new List <int> {
9, 5, 10, 0, 6, 11, -1, 1, 2
};
foreach (var item in insertList)
{
tree.Root = tree.Insert(tree.Root, item);
}
tree.PrintSorted();
tree.Root = tree.DeleteNode(tree.Root, -1);
tree.PrintSorted();
}