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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.
It is stated in the kata that array is never empty
bug: if arr is empty, it will return 1 instead of 0.
haha, guess I learned a new method today, I used regex for mine.