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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.
Is it solvable with sliding window ? My idea was to use windows size of 3 and then check for triplets in the window and check the number to add to the result. Any hints ?