private NodeBT FindElement(int value, out NodeBT parent)
{
var current = _head;
parent = null;
while (current != null)
{
if (current.Value > value)
{
parent = current;
current = current.Left;
}
else if (current.Value < value)
{
parent = current;
current = current.Right;
}
else
{
break;
}
}
return(current);
}
private void AddTo(NodeBT node, int value)
{
if (node.Value > value)
{
if (node.Left == null)
{
node.Left = new NodeBT(value);
}
else
{
AddTo(node.Left, value);
}
}
else if (node.Value < value)
{
if (node.Right == null)
{
node.Right = new NodeBT(value);
}
else
{
AddTo(node.Right, value);
}
}
}
public void Add(int value)
{
if (_head == null)
{
_head = new NodeBT(value);
}
else
{
AddTo(_head, value);
}
Size++;
}
public void Add(int value)
{
if (_head == null)
{
_head = new NodeBT(value);
}
else
{
AddTo(_head, value);
}
Size++;
}
private int Width(NodeBT node)
{
var maxWidth = 0;
var height = Height(node);
for (var i = 1; i <= height; i++)
{
var width = GetWidth(node, i);
if (width > maxWidth)
{
maxWidth = width;
}
}
return(maxWidth);
}
private int GetWidth(NodeBT node, int level)
{
if (node == null)
{
return(0);
}
if (level == 1)
{
return(1);
}
else if (level > 1)
{
return(GetWidth(node.Left, level - 1) + GetWidth(node.Right, level - 1));
}
var count = GetWidth(node.Right, level - 1);
return(count);
}
private int Height(NodeBT node)
{
var count = 0;
var leftHeight = 0;
var rightHeight = 0;
if (node == null)
{
return(0);
}
if (node.Left != null)
{
leftHeight = Height(node.Left);
}
if (node.Right != null)
{
rightHeight = Height(node.Right);
}
count = Math.Max(leftHeight, rightHeight) + 1;
return(count);
}
public void Del(int value)
{
NodeBT parent;
var current = FindElement(value, out parent);
if (current == null)
{
return;
}
Size--;
if (current.Right == null)
{
if (parent == null)
{
_head = current.Left;
}
else
{
if (parent.Value > current.Value)
{
parent.Left = current.Left;
}
else if (parent.Value < current.Value)
{
parent.Right = current.Left;
}
}
}
else if (current.Right.Left == null)
{
current.Right.Left = current.Left;
if (parent == null)
{
_head = current.Right;
}
else
{
if (parent.Value > current.Value)
{
parent.Left = current.Right;
}
else if (parent.Value < current.Value)
{
parent.Right = current.Right;
}
}
}
else
{
var leftMost = current.Left;
var leftMostParent = leftMost.Left;
while (leftMost.Left != null)
{
leftMostParent = leftMost;
leftMost = leftMost.Left;
}
leftMostParent.Left = leftMost.Right;
leftMost.Left = current.Left;
leftMost.Right = current.Right;
if (parent == null)
{
_head = leftMost;
}
else
{
if (parent.Value > current.Value)
{
parent.Left = leftMost;
}
else if (parent.Value < current.Value)
{
parent.Right = leftMost;
}
}
}
}
private int Width(NodeBT node)
{
var maxWidth = 0;
var height = Height(node);
for (var i = 1; i <= height; i++)
{
var width = GetWidth(node, i);
if (width > maxWidth)
{
maxWidth = width;
}
}
return maxWidth;
}
private int Height(NodeBT node)
{
var count = 0;
var leftHeight = 0;
var rightHeight = 0;
if (node == null)
{
return 0;
}
if (node.Left != null)
{
leftHeight = Height(node.Left);
}
if (node.Right != null)
{
rightHeight = Height(node.Right);
}
count = Math.Max(leftHeight, rightHeight) + 1;
return count;
}
public void Clear()
{
_head = null;
Size = 0;
}
private int GetWidth(NodeBT node, int level)
{
if (node == null)
{
return 0;
}
if (level == 1)
{
return 1;
}
else if (level > 1)
{
return GetWidth(node.Left, level - 1) + GetWidth(node.Right, level - 1);
}
var count = GetWidth(node.Right, level - 1);
return count;
}
private NodeBT FindElement(int value, out NodeBT parent)
{
var current = _head;
parent = null;
while (current != null)
{
if (current.Value > value)
{
parent = current;
current = current.Left;
}
else if (current.Value < value)
{
parent = current;
current = current.Right;
}
else
{
break;
}
}
return current;
}
private void AddTo(NodeBT node, int value)
{
if (node.Value > value)
{
if (node.Left == null)
{
node.Left = new NodeBT(value);
}
else
{
AddTo(node.Left, value);
}
}
else if (node.Value < value)
{
if (node.Right == null)
{
node.Right = new NodeBT(value);
}
else
{
AddTo(node.Right, value);
}
}
}
public void Del(int value)
{
NodeBT parent;
var current = FindElement(value, out parent);
if (current == null)
{
return;
}
Size--;
if (current.Right == null)
{
if (parent == null)
{
_head = current.Left;
}
else
{
if (parent.Value > current.Value)
{
parent.Left = current.Left;
}
else if (parent.Value < current.Value)
{
parent.Right = current.Left;
}
}
}
else if (current.Right.Left == null)
{
current.Right.Left = current.Left;
if (parent == null)
{
_head = current.Right;
}
else
{
if (parent.Value > current.Value)
{
parent.Left = current.Right;
}
else if (parent.Value < current.Value)
{
parent.Right = current.Right;
}
}
}
else
{
var leftMost = current.Left;
var leftMostParent = leftMost.Left;
while (leftMost.Left != null)
{
leftMostParent = leftMost;
leftMost = leftMost.Left;
}
leftMostParent.Left = leftMost.Right;
leftMost.Left = current.Left;
leftMost.Right = current.Right;
if (parent == null)
{
_head = leftMost;
}
else
{
if (parent.Value > current.Value)
{
parent.Left = leftMost;
}
else if (parent.Value < current.Value)
{
parent.Right = leftMost;
}
}
}
}
public void Clear()
{
_head = null;
Size = 0;
}