In the Code Golf Overflow, can your answers be written in any language unless otherwise specified by the OP?
Or do they have to be written in any specific language?
Submissions can use any programming language that meets our criteria for qualifying as a language. We also require that the version of the language you use be released prior to the posting of the challenge. This ensures that people don't see a challenge and implement a feature in their language just to be competitive in that challenge.
Language-specific or language-restricted challenges are generally frowned upon here, so it's not often that you'll find a challenge where you can't use your favorite language.