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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.
While this solution is easier to implement (which is genius, to be honest), it's not feasible based on time complexity.
You can use this code to compare this function with other implementations for comparison: