The language selected is not allowed for this problem.

I’m getting the exact error as said in the question title upon submitting answers to the PERMUT2 question. That too, while using C(GCC 4.8.1) or C99 Strict or C++(GCC 4.8.1). I’ll assume that’s happening with all the languages. So, I believe it’s a server issue or something. Or is it an account related issue?

This is happening with me too. I was using std::sort in the TSORT problem, so I guessed STL wasn’t allowed. But I checked some solutions and they were using std::sort.