static void Main(string[] args)
{
BST tree = new BST();
//tree.Root = new OtherNode(8, 5);
//tree.Add(new OtherNode(4, 5));
//tree.Add(new OtherNode(9, 5));
//tree.Add(new OtherNode(10, 7));
//tree.Add(new OtherNode(11, 8));
//tree.Add(new OtherNode(13, 2));
//tree.Add(new OtherNode(2, 13));
//tree.Add(new OtherNode(9, 0));
tree.Root = new Node(8);
tree.Add(new Node(5));
tree.Add(new Node(10));
tree.Add(new Node(11));
tree.Add(new Node(20));
tree.Add(new Node(6));
tree.Add(new Node(1));
tree.Add(new Node(7));
Console.WriteLine("przeszukiwanie pre order");
tree.PreOrder(tree.Root);
Console.WriteLine();
Console.WriteLine("przeszukiwanie in order");
tree.InOrder(tree.Root);
Console.WriteLine();
Console.WriteLine("przeszukiwanie post order");
tree.PostOrder(tree.Root);
Console.WriteLine();
tree.Is_empty();
tree.Make_empty();
tree.Is_empty();
BSTSort drzewko = new BSTSort(10);
drzewko.Pokaz();
drzewko.Sortuj();
Console.ReadKey();
}