my favorate kata answer I've ever seen lol

Bump as C++ still not fixed. The test case counts the "'" character.

Ahh then that would make sense.

Don't feel bad about that. I have no clue either and it looks like in the past five years only 39 people figured it out.

there are no strict perf constraints, many types of solutions are possible

I don't understand what to do?

C++: Tests do not work if the following declarations are removed from a solution:

using namespace std;
using l = unsigned long long;