"You all can check the leaderboard—even Legendary Grandmasters are unable to solve Problem F, and Grandmasters and Masters are struggling with E1 and E2. Why waste such hard-made problems on a Division 2 contest instead of saving them for Division 1? What's the point of putting questions that are unsolvable by Division 2 participants? Contest difficulty should increase linearly, but it often spikes abruptly. What do you all think about this? Feel free to criticize, correct, and share your opinion."