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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.
Oh, you are right. Thank you !
Well, it is implicitly defined when it says "a" is a strictly increasing array of integers. If there is a 0 in "d", that violates the "strictly increasing" part of "a".
I think the reader should figure it out, but if you still think I should be clearer and put it explicitly, please open again the issue
ooooh, way better :)
Thanks, for catching that.
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