Ranks of approved katas cannot be changed, so please don't complain about that and enjoy the cheap points.

a good kata, but i think it would've been better if it was 5kyu or 6kyu

D translation (unifies the description)

A Great Kata For A One That Doesn't Contain Description.

Thanks Alot, This Is My First Time i Practice Recursion

Thanks a lot, it's a pity that the latest version available here is 8.0... I wouldn't have thought about this...

Because 'not pattern' matching was introduced in 9.0? https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9#pattern-matching-enhancements

good kata