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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.
You're right. Although I'd argue my problem has better wording.
I've searched a bit before published and failed to find similiar katas. Can you please link original kata?
What is the best time complexity one could achieve? Mine is O(n^(3/2)) and I still couldn't make it through the time limits.