as said in editorial, to solve 2095C - Would It Be Unrated? you can either brute force or you need another person to get accepted, well the first person who got accepted is AprilFoolsClairvoyant, and if you see the account, the account registered in the middle of the contest, submitted one code for problem C and did nothing else, so who is AprilFoolsClairvoyant? [EDIT] : i just saw the editorial again an trivia 2, "Trivia 2: Some time during contest, a mysterious contestant AprilFoolsClairvoyant from the future submitted the first accepted. Such behaviour is unacceptable as time machines are prohibited by the codeforces rules, so we quickly disqualified him."