(size-of-pile game-state pile-number) must make the call
(game-state 1)
to get the number of coins in pile 1, and the call
(game-state 2)
to get the number of coins in pile 2:
(define size-of-pile
(lambda (game-state pile-number)
(game-state pile-number)))
Q: What is the order of growth of this version of size-of-pile?
A: Θ(1)