There has been no div3 competition for more than a month. I thought about it. The author of div3 is limited (it is fixed), and there is no coordinator. Is it possible to change it? Open the question-making authority of div3 to everyone. My idea is to have a div3 question bank, and everyone can propose their own ideas on it. You can choose the estimated difficulty value yourself. However, such a large number of topics certainly cannot all be handled by the coordinator. My preliminary idea is to open the permission of preliminary review to all users with red name and above, as well as past authors. For a favorite topic, the preliminary reviewer can give it a score and an estimated difficulty value. In this way, the estimated difficulty value of each question is equal to the average of the estimated difficulty values played by all the players, and the score of each question is equal to the sum of the scores of all players. Then, at regular intervals (such as a week), the system will automatically push the five questions with the highest scores in each difficulty range to the coordinator for selection by the coordinator. After the coordinator selects a satisfactory topic, the author of each topic will be notified to prepare a topic on the polygon. Then a new div3 is completed! It's just a preliminary idea, everyone is welcome to add it.

He has been engaged in algorithm competitions for five years, but his rating is still a newbie. Sometimes, he can't even solve a problem in div2. It stands to reason that the algorithm competition is not suitable for him, he should give up, but he still persevered, and it lasted for five years. I am very moved by this love of algorithm competitions. Yes, his id is rainboy.

Two days after the large-scale cheating incident that occurred in goodbye2020, Mike and the codeforces team still did not make an official response to the incident, which made me (maybe us) very disappointed. Maybe there is not enough evidence to prove that the cheaters did cheat, and it is difficult to change the result of that contest. But at least, the codeforces official should have a statement on how to prevent similar incidents from occurring in the future, and corresponding measures, etc. But I did not see these. I love codeforces, but codeforces disappointed me this time.