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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.
try this to measure time :
I did it on the solution that I implemented (based on a sort) and found it OK in performance compared to other solutions.
For ex on a 1-million items list: time to execute with sort = 3 ms, time to execute with solution with sets = 8 ms
for whatever that's worth ...