OI reflection and problem analysis

In view of the recent downturn, I have also reached the second year of junior high school, which is also the time to take a chance (to be precise, it is delayed AFO time), so it is time to analyze the problem:

1. Improper distribution of competition time (always doing nothing for the first two hours, then answering questions for an hour, violently violent in the last hour, and then failing in correct answers, no points for violence)
2. I always read the wrong questions, and then a blue question turns black (noi online improves T1)
3. I didn’t squeeze out time to compare photos, and even didn’t use violence in some questions, and then I didn’t take photos, so I got a score of 0
4. Always wasting time and not thinking

Then think about how to correct and improve:

1. Arrange the time well (read the questions clearly in the first hour, do the violence well, then think about it for about 1h to 1.5h, and finally implement it and compare the shots)
2. Read the question carefully
3. Get some rest, but don’t be in a daze
4. Match your shots as much as possible

Then, let’s list the questions that often arise during competitions:

1. File input and output, don’t make mistakes, don’t make random changes, check again and again before finishing (CSP2021 improves T2T3)
2. We must fight violence first, and then fight for correct answers. It is best to match the shooting (CSP2021 popularizes T4)
3. Use %ld when outputting long long (CSP2020 improves T2), and when high precision is required, use high precision (NOIP2020T1)
4. To understand the meaning of the question clearly, you can use violent running examples to confirm whether you really got it right (noi online2022 improves T1)
5. Don’t get stuck in one area. Some questions can be thought about extensively and deeply to explore the nature of the question, such as: monotonicity.
6. Strings must be kept in mind and the board can be used flexibly (KMP, AC automaton, HASH, Manager...palindrome trees and suffix arrays must be learned again)
7. For DP questions, first set the state, and then derive the formula. If it doesn't work, add one dimension (noi online2022 popularizes T3, CSP2021 improves T2)
8. Mathematics problems, work hard to find the rules and analyze them from the essence

Finally, I wish GDOI2022 good results (at least two questions, complete with violence)