Either I am really thick (I hope so, I hope I'm just not getting it), or this problem is just stupid. I don't understand the problem explanation at all, because it doesn't explain anything in particular, it just hints to a pattern and states the answer to a testcase, but not WHY the answer is correct in regard to the dumb story.

I suppose we have to return a set of the largest numbers of all possible variations of the differences? If so, why the superfluous and distracting story? It doesn't offer any analogies relevant to the problem, which actually isn't even a problem at all, but merely a task that doesn't serve any purpose.

That is, if I am not fundamentally misunderstanding everything. In this case I'll gladly admit I'm an idiot, if this means I can solve this challenge.

Please enlighten me, I'd appreciate it.