public BinNode(ref T data)
{
Data = data;
Key = Data.GetHashCode();
Height = 1;
LeftChild = RightChild = null;
}
private BinNode <Q> Insert <Q>(BinNode <Q> node, ref Q data, out bool treeModified)
{
if (node == null)
{
treeModified = true;
return(new BinNode <Q>(ref data));
}
var newNodeKey = data.GetHashCode();
if (node.Key > newNodeKey)
{
node.LeftChild = Insert <Q>(node.LeftChild, ref data, out treeModified);
}
else if (node.Key < newNodeKey)
{
node.RightChild = Insert <Q>(node.RightChild, ref data, out treeModified);
}
else
{
treeModified = false;
}
if (treeModified)
{
return(Balance <Q>(node));
}
return(node);
}
private BinNode <Q> RemoveMin <Q>(BinNode <Q> p)
{
if (p.LeftChild == null)
{
return(p.RightChild);
}
p.LeftChild = RemoveMin <Q>(p.LeftChild);
return(Balance <Q>(p));
}
private BinNode <Q> LeftTurn <Q>(BinNode <Q> p)
{
var q = p.RightChild;
p.RightChild = q.LeftChild;
q.LeftChild = p;
p.FixHeight();
q.FixHeight();
return(q);
}
private BinNode <Q> Delete <Q>(BinNode <Q> node, ref Q data, out bool treeModified)
{
if (node == null)
{
treeModified = false;
return(null);
}
var dataKey = data.GetHashCode();
if (dataKey < node.Key)
{
node.LeftChild = Delete <Q>(node.LeftChild, ref data, out treeModified);
}
else if (dataKey > node.Key)
{
node.RightChild = Delete <Q>(node.RightChild, ref data, out treeModified);
}
else
{
if (data.Equals(node.Data))
{
treeModified = true;
var l = node.LeftChild;
var r = node.RightChild;
if (r == null)
{
return(l);
}
var min = FindMin <Q>(r);
min.RightChild = RemoveMin <Q>(r);
min.LeftChild = l;
return(Balance <Q>(min));
}
treeModified = false;
return(node);
}
if (treeModified)
{
return(Balance <Q>(node));
}
return(node);
}
private BinNode <Q> Balance <Q>(BinNode <Q> p)
{
p.FixHeight();
if (p.BalanceFactor == 2)
{
if (p.RightChild.BalanceFactor < 0)
{
p.RightChild = RightTurn <Q>(p.RightChild);
}
p = LeftTurn <Q>(p);
}
if (p.BalanceFactor == -2)
{
if (p.LeftChild.BalanceFactor > 0)
{
p.LeftChild = LeftTurn <Q>(p.LeftChild);
}
p = RightTurn <Q>(p);
}
return(p);
}
public bool Add(T data)
{
bool result = false;
if (_root != null)
{
bool modified;
_root = Insert <T>(_root, ref data, out modified);
if (modified)
{
result = true;
Count++;
}
}
else
{
_root = new BinNode <T>(ref data);
result = true;
Count++;
}
return(result);
}
private BinNode <Q> Find <Q>(BinNode <Q> p, ref Q data)
{
if (p == null)
{
return(null);
}
var dataKey = data.GetHashCode();
if (dataKey < p.Key)
{
return(Find <Q>(p.LeftChild, ref data));
}
else if (dataKey > p.Key)
{
return(Find <Q>(p.RightChild, ref data));
}
else if (data.Equals(p.Data))
{
return(p);
}
return(null);
}
private BinNode <Q> FindMin <Q>(BinNode <Q> p)
{
return(p.LeftChild == null ? p : FindMin <Q>(p.LeftChild));
}
