I didn't realize it would return without calling return. nice.

This is an elegant solution. I'd like to see a line comment that explains what's going on. The concept is slightly obfuscated.

Clear and easy to decipher what is going on. Good Job.

Easy to read. Better practice than one-line sollutions.

we spend most of our time reading code, not writing it.
do us and yourself a favor and learn to write readable code.

Now it expects Nothing instead of Just 0 for [0, 0, 0, 0]. And there are two more edge cases: [123, 1, -1] and [1, -1, 123].

I can't figure out what they want exactly.
I'd like to see the example explained better.

I think it's a great first question for variable assignments.
Make a bunch more that go into more depth.
Using Lists, Tuples, Ints, Dicts, Strings.

have them setup a function that returns the variables etc...
Good Luck