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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 don't even remember writing this but you guys are correct of course. That being said, there are plenty of other kata where honoring Gauss is required.
+1, simple math :P
This has cost O(n), you are actually adding each element one by one. There exists a close formula for this, so O(1) is possible.