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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.
great solution - use space to improve time complexity to O(n).
Can someone explain to me how this actully works
Yes actual efficient code, good job.
This solution should be rated higher.