using System.Collections.Generic;

public class EmptyNode<K, V> : TreeMapNode<K, V>
{
	//static V values;
	// Use this for initialization
	public EmptyNode()
		: base(default(K), default(V))
	{
	}

	public EmptyNode(K key)
		: base(key, default(V))
	{
	}

	public override TreeMapNode<K, V> lefts()
	{
		return new EmptyNode<K, V>();
	}

	public override TreeMapNode<K, V> rights()
	{
		return new EmptyNode<K, V>();
	}

	public override bool isNotEmpty()
	{
		return false;
	}

	public override TreeMapNode<K, V> createNode(K key, V value, TreeMapNode<K, V> left, TreeMapNode<K, V> right)
	{
		return new RedNode<K, V>(key, value, new EmptyNode<K, V>(), new EmptyNode<K, V>());
	}

	public TreeMapNode<K, V> put(K k, V value)
	{
		return new RedNode<K, V>(k, value, new EmptyNode<K, V>(), new EmptyNode<K, V>());
	}

	//I don't know only Comparator method.
	public override rebuildNode<K, V> replaceNode(TreeMapNode<K, V> parent, Comparer<K> ctr)
	{ // not use method
		return new rebuildNode<K, V>(false, this);
	}

	public override rebuildNode<K, V> deleteNode()
	{
		return new rebuildNode<K, V>(false, this);
	}

	public override TreeMapNode<K, V> insBalance()
	{
		return insBalance();
	}

	public override Rotate checkRotate(Rotate side)
	{
		return Rotate.N;
	}

	public override bool isRed()
	{
		return false;
	}

	public override int checkDepth(int count, int minCount)
	{ // test method
		if (count < minCount || minCount == 0)
		{
			minCount = count;
		}
		//c# is there assert??
		//Assert.assertTrue(count <= 2 * minCount);
		return minCount;
	}

}