Yes, my bad. I realized that I got wrong in identifying nulls.

The expected value for this case is false. Your logs are incorrect.

I get wrong in this test case.

std::vector a = {3,2,2};
std::vector b = {9, 9, 4};

expected is true although it is clearly false.

I do. Do you want to try to find it first? If not I'll tell you now...

Don't forget the spoiler flag, please.

Your solution has a potential crash bug in it; the same one that mine has.
Do you see it? (The Kata Test can't catch it that's why ours passed)

Nice!

Can you teach me what did you do here? What is for(auto& x : msg) ?

Thank-you kindly!

This is neat. Nice!

Is there a tutorial that explains this?

This also stopped me from passing the test.

Oh, thank you for clarifying. :)