private AvlNode <TK, TV> LeftRotate(AvlNode <TK, TV> x)
{
var y = x.Right;
var t2 = y.Left;
if (!x.IsRoot)
{
if (x.Parent.Left == x)
{
x.Parent.Left = y;
}
else
{
x.Parent.Right = y;
}
}
// Perform rotation
y.Left = x;
y.Parent = x.Parent;
x.Parent = y;
x.Right = t2;
if (t2 != null)
{
t2.Parent = x;
}
// Update heights
x.RefreshHeight();
y.RefreshHeight();
// Return new root
return(y);
}
private AvlNode <TK, TV> RightRotate(AvlNode <TK, TV> y)
{
var x = y.Left;
var t2 = x.Right;
if (!y.IsRoot)
{
if (y.Parent.Left == y)
{
y.Parent.Left = x;
}
else
{
y.Parent.Right = x;
}
}
// Perform rotation
x.Right = y;
x.Parent = y.Parent;
y.Parent = x;
y.Left = t2;
if (t2 != null)
{
t2.Parent = y;
}
// Update heights
y.RefreshHeight();
x.RefreshHeight();
// Return new root
return(x);
}