public Node <int> deleteRecursive(Node <int> root, int key)
{
if (root == null)
{
return(root);
}
//if key less than root key, traverse left subtree
if (key < root.getData())
{
root.setLeft(deleteRecursive(root.getLeft(), key));
}
//if key greater than root key, traverse right subtree
else if (key > root.getData())
{
root.setRight(deleteRecursive(root.getRight(), key));
}
//found node to delete
else
{
//node to delete has zero or one child node
if (root.getLeft() == null)
{
if (root.getRight() != null)
{
root.getRight().setParent(root.getParent());
}
return(root.getRight());
}
else if (root.getRight() == null)
{
if (root.getLeft() != null)
{
root.getLeft().setParent(root.getParent());
}
return(root.getLeft());
}
//node to delete has two children, so find the smallest node on the right subtree
//replace the node to delete with that node, then delete the smallest node on the right subtree
root.setData(getMinValue(root.getRight()));
root.setRight(deleteRecursive(root.getRight(), root.getData()));
}
return(root);
}
public T remove(Node <T> root, T element)
{
if (root == null)
{
return(default(T));
}
else if (comp.Compare(element, root.getElement()) == 0)
{
if (numberOfChildren(root) == 0)
{
T aux = root.getElement();
if (root == this.root)
{
this.root = null;
}
else
{
if (comp.Compare(element, root.getParent().getLeft().getElement()) == 0)
{
root.getParent().setLeft(null);
root = null;
}
else
{
root.getParent().setRight(null);
root = null;
}
}
numberOfNodes--;
return(aux);
}
else if (numberOfChildren(root) == 1)
{
T aux = root.getElement();
if (root == this.root)
{
if (root.getLeft() != null)
{
this.root = root.getLeft();
}
else
{
this.root = root.getRight();
}
}
else
{
if (root.getParent().getLeft() != null)
{
if (root.getLeft() != null)
{
root.getParent().setLeft(root.getLeft());
}
else
{
root.getParent().setLeft(root.getRight());
}
}
else
{
if (root.getLeft() != null)
{
root.getParent().setRight(root.getLeft());
}
else
{
root.getParent().setRight(root.getRight());
}
}
}
numberOfNodes--;
return(aux);
}
else//El que sustituirá será el más derecho de los izquierdos
{
Node <T> next = root.getLeft();
T aux = root.getElement();
if (next.getRight() != null)
{
while (next.getRight() != null)
{
next = next.getRight();
}
root.setElement(next.getElement());
Node <T> father = next.getParent();
father.setRight(null);
}
else
{
root.setElement(next.getElement());
root.setLeft(null);
}
numberOfNodes--;
return(aux);
}
}
else
{
if (comp.Compare(element, root.getElement()) < 0)
{
return(remove(root.getLeft(), element));
}
else
{
return(remove(root.getRight(), element));
}
}
}
//Tree diagram
// 50
//
// 30 90
//
// 10 45 70 95
//
// 5 35 48 55 105
static void Main(string[] args)
{
Tree tree = new Tree();
tree.insert(50);
tree.insert(30);
tree.insert(80);
tree.insert(10);
tree.insert(45);
tree.insert(70);
tree.insert(95);
tree.insert(5);
tree.insert(35);
tree.insert(48);
tree.insert(55);
tree.insert(90);
tree.insert(105);
Console.WriteLine("Tree has a height of " + tree.getHeight() + ".");
tree.insert(120);
Console.WriteLine("Tree has a height of " + tree.getHeight() + ".");
tree.insert(4);
tree.insert(3);
Console.WriteLine("Tree has a height of " + tree.getHeight() + ".");
Console.WriteLine("Tree has " + tree.getNumberOfNodes() + " nodes.");
Console.WriteLine("Is 70 in the tree? " + (tree.contains(70) ? "Yes" : "No"));
Console.WriteLine("Is 12 in the tree? " + (tree.contains(12) ? "Yes" : "No"));
Console.WriteLine("Is 55 in the tree? " + (tree.contains(55) ? "Yes" : "No"));
Console.WriteLine("Is 40 in the tree? " + (tree.contains(40) ? "Yes" : "No"));
Console.WriteLine("Is 5 in the tree? " + (tree.contains(5) ? "Yes" : "No"));
Console.WriteLine("Is 6 in the tree? " + (tree.contains(6) ? "Yes" : "No"));
Console.WriteLine("Is 48 in the tree? " + (tree.contains(48) ? "Yes" : "No"));
Console.WriteLine("Is 47 in the tree? " + (tree.contains(47) ? "Yes" : "No"));
Node <int> node45 = tree.search(45);
String leftNode45 = node45.getLeft() == null ? "empty" : node45.getLeft().getData().ToString();
String rightNode45 = node45.getRight() == null ? "empty" : node45.getRight().getData().ToString();
String parentNode45 = node45.getParent() == null ? "empty" : node45.getParent().getData().ToString();
Console.WriteLine("Node 45 left child: " + leftNode45 + " right child: " + rightNode45 + " parent: " + parentNode45);
Node <int> node70 = tree.search(70);
String leftNode70 = node70.getLeft() == null ? "empty" : node70.getLeft().getData().ToString();
String rightNode70 = node70.getRight() == null ? "empty" : node70.getRight().getData().ToString();
String parentNode70 = node70.getParent() == null ? "empty" : node70.getParent().getData().ToString();
Console.WriteLine("Node 70 left child: " + leftNode70 + " right child: " + rightNode70 + " parent: " + parentNode70);
Node <int> node105 = tree.search(105);
String leftNode105 = node105.getLeft() == null ? "empty" : node105.getLeft().getData().ToString();
String rightNode105 = node105.getRight() == null ? "empty" : node105.getRight().getData().ToString();
String parentNode105 = node105.getParent() == null ? "empty" : node105.getParent().getData().ToString();
Console.WriteLine("Node 105 left child: " + leftNode105 + " right child: " + rightNode105 + " parent: " + parentNode105);
tree.delete(80);
Node <int> node90 = tree.search(90);
String leftNode90 = node90.getLeft() == null ? "empty" : node90.getLeft().getData().ToString();
String rightNode90 = node90.getRight() == null ? "empty" : node90.getRight().getData().ToString();
String parentNode90 = node90.getParent() == null ? "empty" : node90.getParent().getData().ToString();
Console.WriteLine("Node 90 left child: " + leftNode90 + " right child: " + rightNode90 + " parent: " + parentNode90);
Node <int> node95 = tree.search(95);
String leftNode95 = node95.getLeft() == null ? "empty" : node95.getLeft().getData().ToString();
String rightNode95 = node95.getRight() == null ? "empty" : node95.getRight().getData().ToString();
String parentNode95 = node95.getParent() == null ? "empty" : node95.getParent().getData().ToString();
Console.WriteLine("Node 95 left child: " + leftNode95 + " right child: " + rightNode95 + " parent: " + parentNode95);
Node <int> node50 = tree.search(50);
String leftNode50 = node50.getLeft() == null ? "empty" : node50.getLeft().getData().ToString();
String rightNode50 = node50.getRight() == null ? "empty" : node50.getRight().getData().ToString();
String parentNode50 = node50.getParent() == null ? "empty" : node50.getParent().getData().ToString();
Console.WriteLine("Node 50 left child: " + leftNode50 + " right child: " + rightNode50 + " parent: " + parentNode50);
Console.Write("Inorder: ");
tree.inOrder();
Console.WriteLine();
Console.Write("Preorder: ");
tree.preOrder();
Console.WriteLine();
Console.Write("Postorder: ");
tree.postOrder();
Console.WriteLine();
Console.Write("Breadth first: ");
tree.breadthFirst();
Console.WriteLine();
}