The tests in c++ version are written horribly. How should I debug my solution, if no output to cout or cerr is getting actually written in test reports?
I mean, I can debug it in my terminal and vim, but that kinda defeats the whole purpose of the web-site. Pls, fix

Is c++ version broken? Function composition throws bad_function_call, and matrix_mult gives expected: [unsupported_type, ...] and so is the answer.
Max test works, while min fails. I wonder, why are so many any_cast's in tests?

I am looking on log that is above my code.
And yes, I've read comments for more than a minute and spent two hours of thinking and coding, so, please, keep your assumptions about my time away.
This was not helpful at all.
Thanks anyways for replying.

I don't get it..
Input: a = {2,2,3}, b = {4,9,9}. b is obviously not a squared.
Expected: true.....

While my last version was checking if all elements in b are squares of some number in a, this failed another similar test.

I don't get the point of this exersise.