public static void SplitBySize(Treap <T> current, int toCut, out Treap <T> leftHalf, out Treap <T> rightHalf)
{
if (current == null)
{
leftHalf = null;
rightHalf = null;
}
else if (GetSize(current.Left) >= toCut)
{
SplitBySize(current.Left, toCut, out leftHalf, out rightHalf);
current.Left = rightHalf;
current.update();
rightHalf = current;
}
else
{
SplitBySize(current.Right, toCut - GetSize(current.Left) - 1, out leftHalf, out rightHalf);
current.Right = leftHalf;
current.update();
leftHalf = current;
}
}
public static Treap <T> Merge(Treap <T> leftTreap, Treap <T> rightTreap)
{
if (leftTreap == null)
{
return(rightTreap);
}
if (rightTreap == null)
{
return(leftTreap);
}
if (randomGenerator.Next(0, leftTreap.Size + rightTreap.Size) < leftTreap.Size)
{
leftTreap.Right = Merge(leftTreap.Right, rightTreap);
leftTreap.update();
return(leftTreap);
}
else
{
rightTreap.Left = Merge(leftTreap, rightTreap.Left);
rightTreap.update();
return(rightTreap);
}
}