yep, I should use const reference.

Is this correction sufficient?

Thanks for review! I have fixed all mentioned problems. I agree that using pair is much better approach.

Thank you for review and detailed description of all problems. I already fixed all mentioned points, please review changes.

C++ translation:
https://www.codewars.com/kumite/6244bc2c58ad06006b64b094?sel=6244bc2c58ad06006b64b094

C++ translation:
https://www.codewars.com/kumite/62433060e2be22004f060552?sel=62433060e2be22004f060552

If Rust tests are fine then C++ tests are ok as well.

I'm really sorry for the problems, I have already fixed the issue, this was my first translation and I misunderstood how the tests are checked before publication.

At Example Test Cases I have changed expected value (e.g. 5) into Equals(5), Hidden test cases were fine.

Once again sorry for the problems.

Please comment on the GH thread: https://github.com/codews/runner/issues/113.
You have absolutely right that GCC/CLANG does not implement all C++20 features (my bad), but a few ready to use functions can be helpful to write better solutions.

for sure g++ and clang support c++20

[edit]: it is not true

Add support for C++20 please ;)