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Changing
Array#includeis not an ideal solution as it may break other code if thrown into a more complex program.Superb!
It looks like you did :)
+1 for the Wikipedia-link. Of course there's a Wikipedia page for this type of problem. After reading, it looks like I implemented Brent's algorithm. :)
This is a really cool solution. Although you did pass the tests, you are still not able to spend more then one coin. Awesome!
I agree with Ibriais, but still, this is a pretty clever solution :).
It's an implementation of the "tortoise and hare" algorithm, by Robert W. Floyd. I used the version published in wikipedia, but I find this one to be more straight-forward since it only takes care of finding the loop size, which is exactly what the problem needs.