Loading collection data...
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.
There are only small fixed tests in the test fixture ;-)
Please add randomly generated tests (and probably performance tests too, since that's sort of the point).
Input numbers can have duplicates, but returned result
should not be a repeating number, which are contradictory with each other. Why not deduplicate the input before passing in (or better, pass inSet<Integer>)?