Duplicate of this, no idea how this got missed during the dedup pass on the last one it's literally called powerset.

I wouldn't say it doesn't affect anyone. Top solutions would disappear from the board. Seeing your top solution disappear, could have an impact on some, not so much on others.

Why does invalidating solutions matter though? It doesn't affect anyone, and it's an extremely easy kata so new ones will fill it up fast anyway.

In my opinion, this issue isn't big enough to invalidate thousands of existing solutions in different programming languages. It's a fair point for new challenges, though.

I fail to see how [int] -> int -> [int] is any easier than int -> int -> int -> int -> [int] or even int * int * int -> int -> [int], though?

I prefer lists/arrays/sequences even for fixed sizes. All languages support them and it is easier to work with them in general.

Input should not be provided as a sequence when it is of fixed size.

Good!

I'm a fool, I know nothing

Lua translation!

That's your code's problem, not a kata issue. Try a faster algorithm.

time out...

Scala translation

Remember to not make the refsol a spoiler for the performance version.

Description uses externally hotlinked image.