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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.
I believe they are seeking an increasing sequence, not the difference between the outsides. Here, the longest increasing sequence in this example, I believe, is two elements, so the answer is 1.
Different stack sizes?