/**
* Internal method to remove from a subtree.
*
* @param x the item to remove.
* @param t the node that roots the tree.
* @return the new root.
* @throws ItemNotFoundException if x is not found.
*/
protected BinaryNode<AnyType> remove(AnyType x, BinaryNode<AnyType> t) {
if (t == null) throw new ItemNotFoundException(x.toString());
if (x.compareTo(t.element) < 0) t.left = remove(x, t.left);
else if (x.compareTo(t.element) > 0) t.right = remove(x, t.right);
else if (t.left != null && t.right != null) // Two children
{
t.element = findMin(t.right).element;
t.right = removeMin(t.right);
} else t = (t.left != null) ? t.left : t.right;
return t;
}
/**
* Internal method to insert into a subtree.
*
* @param x the item to insert.
* @param t the node that roots the tree.
* @return the new root.
* @throws DuplicateItemException if x is already present.
*/
protected BinaryNode<AnyType> insert(AnyType x, BinaryNode<AnyType> t) {
if (t == null) t = new BinaryNode<AnyType>(x);
else if (x.compareTo(t.element) < 0) t.left = insert(x, t.left);
else if (x.compareTo(t.element) > 0) t.right = insert(x, t.right);
else throw new DuplicateItemException(x.toString()); // Duplicate
return t;
}
/**
* Recursive helper method to remove a value from the tree
*
* @param x the value to be removed
* @param t the node to remove value from
* @return the node with removed value
*/
protected BinaryNode<Integer> remove(Integer x, BinaryNode<Integer> t) {
if (t == null) {
return t;
}
int compareResult = x.compareTo(t.element);
if (compareResult < 0) {
t.left = remove(x, t.left);
} else if (compareResult > 0) {
t.right = remove(x, t.right);
} else if (t.left != null && t.right != null) {
t.element = findMin(t.right).element;
t.right = remove(t.element, t.right);
} else {
t = (t.left != null) ? t.left : t.right;
}
return t;
}
/**
* Return a reference to a node that is the root of a duplicate of the binary tree rooted at the
* current node.
*/
public BinaryNode<AnyType> duplicate() {
BinaryNode<AnyType> root = new BinaryNode<AnyType>(element, null, null);
if (left != null) // If there's a left subtree
root.left = left.duplicate(); // Duplicate; attach
if (right != null) // If there's a right subtree
root.right = right.duplicate(); // Duplicate; attach
return root; // Return resulting tree
}
private BinaryNode singleRightRotation() {
BinaryNode temp = this.left;
if (temp != null) {
this.left = temp.right;
}
temp.right = this;
rotationCount++;
return temp;
}
public BinaryNode add(BinaryNode current, int data) {
if (current == null) {
current = new BinaryNode(data);
} else {
if (data >= (Integer) current.data) current.right = add(current.right, data);
else current.left = add(current.left, data);
}
return current;
}
/**
* Internal method to insert into a subtree.
*
* @param x the item to insert.
* @param t the node that roots the tree.
* @return the new root.
* @throws DuplicateItemException if x is already present.
*/
protected BinaryNode<AnyType> insert(AnyType x, BinaryNode<AnyType> t) {
if (t == null) t = new BinaryNode<AnyType>(x);
else if (x.compareTo(t.element) < 0) t.left = insert(x, t.left);
else if (x.compareTo(t.element) > 0) t.right = insert(x, t.right);
else {
t.increaseDuplicateCount();
t.hasDuplicate = true;
t.duplicate = duplicate(x, t.duplicate);
}
return t;
}
/**
* Recursive helper method to insert a value in the tree
*
* @param x the value to be inserted
* @param t the node to insert value in
* @return the node with the inserted value
*/
protected BinaryNode<Integer> insert(Integer x, BinaryNode<Integer> t) {
if (t == null) {
return new BinaryNode<Integer>(x, null, null);
}
int compareResults = x.compareTo((Integer) t.element);
if (compareResults < 0) {
t.left = insert(x, t.left);
} else if (compareResults > 0) {
t.right = insert(x, t.right);
}
return t;
}
public BinaryNode toTree(BinaryNode root, int[] array, int length, int counter) {
if (counter == length) {
counter = 0;
return null;
} else {
BinaryNode node = new BinaryNode(array[counter]);
if (array[counter] <= (Integer) root.data) {
root.right = node;
counter++;
toTree(root.right, array, length, counter);
} else {
root.left = node;
counter++;
toTree(root.left, array, length, counter);
}
}
return root;
}
static BinaryNode WithRightChild(BinaryNode k1) {
BinaryNode k2 = k1.right;
k1.right = k2.left;
k2.left = k1;
return k2;
}
static BinaryNode doubleWithRightChild(BinaryNode k1) {
k1.right = WithLeftChild(k1.right);
return WithRightChild(k1);
}
static BinaryNode WithLeftChild(BinaryNode k2) {
BinaryNode k1 = k2.left;
k2.left = k1.right;
k1.right = k2;
return k1;
}
public void InsertRight(BinaryNode current, BinaryNode insert) {
insert.right = current.right;
insert.left = current;
current.right = insert;
}