Got it thank you;-)

you can't, because it has no length. re-read the Remarks portion of the description

Ah dangit, negative numbers, why didn't I think of those?

Thanks for the hint!

it was printed:

sorted vector 1: [-161, -144, -144, -121, -11, 19, 19, 19]
sorted vector 2: [121, 361, 361, 361, 14641, 20736, 20736, 25921]

there's nothing mysterious about it, you just have to write code to handle negative numbers

try printing inputs to console to see where it fails

spoiler