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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
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Smart usage of center - cool trick!
This is a clever way of using recursion to make this a one-liner, but at the cost of veryfying initial conditions (which may end up in -1) every time ball bounces :(
Great idea for a story! I'm from PL and didn't knew about this whole USA floor concept!