@hobovsky: thanks!
Fixed.

This test is correct, and other tests also seem to be correct, but I think you could mix up tests cases which you failed. Please see here to confirm: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#how-can-i-see-which-input-causes-my-solution-to-fail

If you are sure you are failing exactly this test, you can share your code so we can take a look.

Yes, that's correct.

the two arrays have the "same" elements, with the same multiplicities.

Kata works OK, but it seems g964 broke initial solution stub when fixing the C++ version of the kata recently. It's not something what would stop you from solving the kata, but you have to be familiar with C++ a bit to know what's wrong. I believe g964 will fix it soon, but until then you can use this code as starting point:

#include <vector>

class Same {
public :
    static bool comp(std::vector<int>&a, std::vector<int>&b) {
      // your code
      return false;
    }
};

Paste this code into "Solution" panel and fill in the method comp with your implementation.