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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.
could you explain why don't you need to generate primes? I'm confused by this. my solution generates a set of primes.
It is possible to find k largest items in O(n log k).
It isn't possible to go faster than O(n log n). Sort based solutions are asymptotically optimal.