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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 reason why its timing out is because of the time complexity of O(n^2). If you read the description it tells you that there will be some really long arrays. You should try another solution