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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.
The final tests contain 50 tests with ~1k elements and 10 tests with ~20m elements. Make sure you can pass all within the timeframe of your language.
Hi! There is a solution with O(n) time complexity. Good luck!