public TreeNode FindSubtreeLeaf(TreeNode node, int element)
{
if (node.IsLeaf())
{
return(node);
}
else
{
if (element < node.elements[0])
{
return(this.FindSubtreeLeaf(node.children[0], element));
}
else if (node.NumberOfElements() == 1 || (element > node.elements[0] && element < node.elements[1]))
{
return(this.FindSubtreeLeaf(node.children[1], element));
}
else if (node.NumberOfElements() == 2 || (element > node.elements[1] && element < node.elements[2]))
{
return(this.FindSubtreeLeaf(node.children[2], element));
}
else
{
return(this.FindSubtreeLeaf(node.children[3], element));
}
}
}
public bool TryInsert(TreeNode treeNode, int element)
{
bool result = true;
if (treeNode.NumberOfElements() == 0 && treeNode.parent == null)
{
treeNode.elements[0] = element;
}
else if (treeNode.NumberOfElements() < this.limit)
{
treeNode.elements[treeNode.NumberOfElements()] = element;
this.SortElements(treeNode.elements, treeNode.NumberOfElements());
}
else
{
result = false;
}
return(result);
}
//Tries to insert the elements, if not returns false
public bool TryInsert(TreeNode treeNode, int element)
{
bool result = true;
//If it is root just add the element to the root
if (treeNode.NumberOfElements() == 0 && treeNode.parent == null)
{
treeNode.elements[0] = element;
}
else if (treeNode.NumberOfElements() < this.limit)
{
treeNode.elements[treeNode.NumberOfElements()] = element;
this.SortElements(treeNode.elements, treeNode.NumberOfElements());
}
else
{
result = false;
}
return result;
}
//Look for the right or the closest siblings with two or three elements, if not returns -1
public int HasChildWithTwoElement(TreeNode node)
{
int result = -1;
//check the number of the children equality to 2
if (node.NumberOfElements() == 1)
{
for (int i = 0; i < node.children.Length; i++)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
//number of the children equality to 3
else if (node.NumberOfElements() == 2)
{
if (node.children[0].NumberOfElements() == 0)
{
for (int i = 0; i < node.children.Length; i++)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
// I should take from the right first so the loop counter is decreasing
else
{
for (int i = node.children.Length - 1; i >= 0; i--)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
}
//number of the children equality to 4
else if (node.NumberOfElements() == 3)
{
if (node.children[0].NumberOfElements() == 0)
{
for (int i = 0; i < node.children.Length; i++)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
// I should take from the right first so the loop counter is decreasing
else
{
if (node.children[1].NumberOfElements() == 0)
{
//Check for the element at the right first
for (int i = 1; i < node.children.Length; i++)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
//If doesn't exist in the right look left
if (result == -1)
{
if (node.children[0].NumberOfElements() == 2 || node.children[0].NumberOfElements() == 3)
{
result = node.children[0].NumberOfElements() * 10;
}
}
}
else
{
for (int i = node.children.Length - 1; i >= 0; i--)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
}
}
return result;
}
public TreeNode FindSubtreeLeaf(TreeNode node, int element)
{
if (node.IsLeaf())
return node;
else
{
if (element < node.elements[0])
return this.FindSubtreeLeaf(node.children[0], element);
else if (node.NumberOfElements() == 1 || (element > node.elements[0] && element < node.elements[1]))
return this.FindSubtreeLeaf(node.children[1], element);
else if (node.NumberOfElements() == 2 || (element > node.elements[1] && element < node.elements[2]))
return this.FindSubtreeLeaf(node.children[2], element);
else
return this.FindSubtreeLeaf(node.children[3], element);
}
}
public TreeNode FindNode(TreeNode node, int element)
{
bool isFound = false;
if (node != null)
{
for (int i = 0; i < node.NumberOfElements(); i++)
{
if (node.elements[i] == element)
isFound = true;
}
if (isFound == true)
return node;
else if (node.NumberOfElements() == 1)
{
if (element < node.elements[0])
return FindNode(node.children[0], element);
else
return FindNode(node.children[1], element);
}
else if (node.NumberOfElements() == 2)
{
if (element < node.elements[0])
{
return FindNode(node.children[0], element);
}
else if (element > node.elements[1])
{
return FindNode(node.children[2], element);
}
else
{
return FindNode(node.children[1], element);
}
}
else if (node.NumberOfElements() == 3)
{
if (element < node.elements[0])
{
return FindNode(node.children[0], element);
}
else if (element > node.elements[0] && element < node.elements[1])
{
return FindNode(node.children[1], element);
}
else if (element > node.elements[1] && element < node.elements[2])
{
return FindNode(node.children[2], element);
}
else
{
return FindNode(node.children[3], element);
}
}
}
return null;
}
public int HasChildWithTwoElement(TreeNode node)
{
int result = -1;
if (node.NumberOfElements() == 1)
{
for (int i = 0; i < node.children.Length; i++)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
else if (node.NumberOfElements() == 2)
{
if (node.children[0].NumberOfElements() == 0)
{
for (int i = 0; i < node.children.Length; i++)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
else
{
for (int i = node.children.Length - 1; i >= 0; i--)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
}
else if (node.NumberOfElements() == 3)
{
if (node.children[0].NumberOfElements() == 0)
{
for (int i = 0; i < node.children.Length; i++)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
else
{
if (node.children[1].NumberOfElements() == 0)
{
for (int i = 1; i < node.children.Length; i++)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
if (result == -1)
{
if (node.children[0].NumberOfElements() == 2 || node.children[0].NumberOfElements() == 3)
{
result = node.children[0].NumberOfElements() * 10;
}
}
}
else
{
for (int i = node.children.Length - 1; i >= 0; i--)
{
if (node.children[i] != null)
{
if (node.children[i].NumberOfElements() == 2 || node.children[i].NumberOfElements() == 3)
{
result = i;
result = result + node.children[i].NumberOfElements() * 10;
break;
}
}
}
}
}
}
return(result);
}
public TreeNode FindNode(TreeNode node, int element)
{
bool isFound = false;
if (node != null)
{
for (int i = 0; i < node.NumberOfElements(); i++)
{
if (node.elements[i] == element)
{
isFound = true;
}
}
if (isFound == true)
{
return(node);
}
else if (node.NumberOfElements() == 1)
{
if (element < node.elements[0])
{
return(FindNode(node.children[0], element));
}
else
{
return(FindNode(node.children[1], element));
}
}
else if (node.NumberOfElements() == 2)
{
if (element < node.elements[0])
{
return(FindNode(node.children[0], element));
}
else if (element > node.elements[1])
{
return(FindNode(node.children[2], element));
}
else
{
return(FindNode(node.children[1], element));
}
}
else if (node.NumberOfElements() == 3)
{
if (element < node.elements[0])
{
return(FindNode(node.children[0], element));
}
else if (element > node.elements[0] && element < node.elements[1])
{
return(FindNode(node.children[1], element));
}
else if (element > node.elements[1] && element < node.elements[2])
{
return(FindNode(node.children[2], element));
}
else
{
return(FindNode(node.children[3], element));
}
}
}
return(null);
}