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.