How is it going? :)

Nobody is going to modify an 8 kyu kata to have a performance requirement.

@TimSonrisa, it's your solution which is inefficient, so don't talk like that, please.

Exactly what I thought, the upvoted solutions are terrible - very inefficient, using sorted on already sorted arrays.

Thank you very much :-) This makes me really happy

The arrays are small enough that you don't need to be efficient in the solution.

Probably yes, but I can't change it...

Use the force! ...I mean, a search engine, and you will quickly find the theory behind it

Errrr .. Number Theory!

( That's like waving a magic wand and saying it'll be OK .. :)

I actually sat down, looked at even and odd numbers and at what possible differences of squares make up what numbers, and there is a pattern there.

He's solved it, I think he's just asking why it works like that.

Thanks!

Specialing amended to Specializing in all tests