Project Euler Problem 31 Solution

Question

In England the currency is made up of pounds, £, and pence, p, and there are eight coins in general circulation:

1p, 2p, 5p, 10p, 20p, 50p, £1 (100p) and £2 (200p)

It is possible to make £2 in the following way:

1 × £1 + 1 × 50p + 2 × 20p + 1 × 5p + 1 × 2p + 3 × 1p

How many different ways can £2 be made using any number of coins?

Haskell

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Ruby