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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.
Sum over a range is
O(n^3)? You should work on your knowledge first before "teaching" others.Not an issue, yes. @jerome: you need something more efficient (it's not about optimization, tho. It's about finding a better algorithm)
Your solution is O(n^3), pretty slow. It needs optimized.
Also, this is a question, not an issue.