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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.
I think there is some bug in the tester code. I think it'd ask for numbers larger than
Integer.MAX_INTEGERsometimes in the Java implementation.Avoid recursion, or use recursion with memoization.