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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.
в отрицательных числах пос.ледовательно кажется бывает в обратном порядке. -4 -3 -2 -1- 0 1 2 3 4 . но в данной задаче условие же другое...
not sure if this answers your question, but in the description it shows "The numbers will also all be unique and in ascending order." so the example you gave will not be in our case;