Great solution!

...without a map...

But this is the cheat :-) not a real solution

If Rust is okay with it, the math must be correct. Perhaps we've entered another dimension?

wat.

Very efficient!

Best performance

added here

ok. now, time for the 25 randomized tests! :D

case 1: return "1!/0!";

But this solution does not account for negative values... 🤔

Length of sequence times average of sequence equals sum of sequence.

"? true : false" is unnecessary

whaaaaaaaaaaaaat?

There is only 1 random test, which is still not enough