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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.
Very cool... but most definitely should be harder than 5 kyu!
I came up with a similar solution; quick question, though: why do you need
arr.length+1in your ans array instead ofarr.length?