Exercise 13.2.1

Write the pseudocode for RIGHT-ROTATE.

I'm pretty sure I'll end up implementing rotations in C in the later exercises, so I'm gonna wing it with the pseudocode here:

    x = y.left
    y.left = x.right
    if x.right != T.nil
        x.right.p = y
    x.p = y.p

    if y.p == T.nil
        T.root = x
    elseif y == y.p.left
        y.p.left = x
        y.p.right = x
    x.right = y
    y.p = x

I've chosen to name the variable y to match the figure in the text.