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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.
Needs a test case where the difference of the distance calculated from two phones is greater than 1000 meters (there is only a test for when their sum is less than 1000 meters).
No random tests.
People are still precomputing primes ;-)
Suggested anti-cheat: if two different instances of the same prime generator are both used with the same argument (e.g 10000), they should return the result in rough the same time.
Lots of people are definitely not doing the "generator" part correctly D:
I think you probably need some performance tests.