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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.
This is a solution but remember guys, the O notation for this is B(n * m) there's not better solution talking about Big o but we can use join or repat that internaly improve the performance. At the end the big o is B(n * m) but internaly we can improve a little bit the performance c: