Solutions typically do not sanitize or validate inputs unless they are part of the test cases.

Correct– .sort() works inplace. While that reduces memory overhead, that is bad practice for most functions because of Python's implicit pass-by-assignment mechanic. The function would have the side-effect of sorting the original list, which might or might not cause a very difficult to find bug later.

Always load libraries at the beginning of your code. The reason is two-fold: those reading your code know exactly what libraries you are using, and it increases the efficiency of your functions (as the function would have to check if that library was loaded everytime it was called).

Is it ready to be published?

I converted it to use random and chrono instead.
Edit: Noticed I left a rand. Fixed it.

I moved the reference function to a lambda inside the random test block, and I changed the call order of the solutions. I also changed the srand/time calls to reference the std namespace. I ensured the vector stays between 2 and 50 elements. Does that solve all the problems?

Especially bad since it received best practices instead of clever

C++ Translation :)
https://www.codewars.com/kumite/5d33ab9634d006000e7becf0?sel=5d33ab9634d006000e7becf0

Please approve!

C++ translation kumited :)
https://www.codewars.com/kumite/5d2f5b90bceae8000fd4df2c?sel=5d2f5b90bceae8000fd4df2c