This guy Doflaming0 is a genius. In Educational Codeforces Round 190, he uses python for ABC then mystically changes to c++ for DE before changes back to python for F. In the code for problems ABC, he writes some Vietnamese comments (maybe for better understanding), but for problems DEF (which are considered harder), he writes no comments. His unusual coding habits may help him become a lgm. Good luck, Doflaming0.