Hello, I'm Sanae.↵
↵
In ufc+8 zone, I watched the entire contest at midnight. Too many cheaters emerged and we were busy banning them. I noticed WA submissions on [problem:2228B], [problem:2228C2] and TLE submissions on [problem:2228D], which was intended. Soon after the end of the contest, I released the editorial. The bad news was, the complaints flooded the website and my contribution fell from +91 to -92. After reflecting on the issues, I was anixous and blamed myself. Now, I make an apology to point out the problems to avoid them next time. Sorry, everyone!↵
↵
↵
1. Too many cheaters emerged.↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365371)↵
2. The problems stay in the queue for a very long time bothered contestants.↵
3. B is easy but many contestants misssed the corner case. And C has many corner cases.↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365212),↵
[Comment 2](https://codeforces.me/blog/entry/153617?#comment-1365256),↵
[Comment 3](https://codeforces.me/blog/entry/153617?#comment-1365272)↵
4. **The time limit of D is too tight.**↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365219),↵
[Comment 2](https://codeforces.me/blog/entry/153617?#comment-1365222),↵
[Comment 3](https://codeforces.me/blog/entry/153617?#comment-1365244),↵
[Comment 4](https://codeforces.me/blog/entry/153617?#comment-1365256),↵
[Comment 5](https://codeforces.me/blog/entry/153617?#comment-1365322),↵
[Comment 6](https://codeforces.me/blog/entry/153619?#comment-1365304)↵
5. Problems are too hard.↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365229)↵
6. The samples are weak.↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365238),↵
[Comment 2](https://codeforces.me/blog/entry/153619?#comment-1365327)↵
7. The contest causes a lot of rage.↵
My heart is broken. (;﹏;)↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365256),↵
[Comment 2](https://codeforces.me/blog/entry/153617?#comment-1365224),↵
[Comment 3](https://codeforces.me/blog/entry/153617?#comment-1365371)↵
8. C>>D↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365371),↵
[Comment 2](https://codeforces.me/blog/entry/153617?#comment-1365371)↵
9. E is AI-solveable.↵
[Comment 1](https://codeforces.me/blog/entry/153619?#comment-1365404)↵
10. E takes too much time and F is so easy.↵
[Comment 1](https://codeforces.me/blog/entry/153619?#comment-1365331)↵
11. C and D are dull implementation and attention exercises.↵
[Comment 1](https://codeforces.me/blog/entry/153777?#comment-1365517)↵
↵
There are still problems unmentioned, but they are enough. I take 4 most seriously. Although 2 seconds can be enough for the best solution, some correct solutions are killed, which obey the principle of problem setting. During testing, D was accepted by different solutions and even $O(n\log n)$ solution can run within 1.1s. Given that, I didn't modify the TL. $If I had set the TL bigger, the contest could reach its expectation.↵
↵
I'm sorry for the weak sample. The $n=2$ in B bothering everyone is intended, but I should have put it in samples at CF. But I didn't even realize C has many corner cases. I set $a$ up to $10^{17}$ to reduce the diffculty. In the original version, $a$ could be up to $10^{10^5}$. Although the corner cases are the necessary parts in the problem, I missed them. Sorry again.↵
↵
We tried our best to capture the cheaters, and you can point them out on your own. I'm sorry for that. They are easy to find, though.↵
↵
Indeed, E should have more scores than F, since it takes more time. I have done the wrong evaluation for the difficulty.↵
↵
I don't want to show CNOI style initially and make the problems easier and easier. I only hoped that problems would be interesting. Some are said to be standard, but I still believe they have the value of thinking. A is easy. B is easy but have corner cases, which is intended. C is not so easy and happens to have many corner cases. TL for D is too tight. Score of E is too low. F is ok but misses the $O(n)$ solution. I have made so many mistakes even after so much testing. I let contestants down, failing to keep my promise. (T_T)↵
↵
I will not author problems any longer until I'm mature enough. I'm guilty and carry this regret from then on. I hope my mistakes serve as a lesson. I have let you down. Sorry...↵
↵
**May love persist?**
↵
In ufc+8 zone, I watched the entire contest at midnight. Too many cheaters emerged and we were busy banning them. I noticed WA submissions on [problem:2228B], [problem:2228C2] and TLE submissions on [problem:2228D], which was intended. Soon after the end of the contest, I released the editorial. The bad news was, the complaints flooded the website and my contribution fell from +91 to -92. After reflecting on the issues, I was anixous and blamed myself. Now, I make an apology to point out the problems to avoid them next time. Sorry, everyone!↵
↵
↵
1. Too many cheaters emerged.↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365371)↵
2. The problems stay in the queue for a very long time bothered contestants.↵
3. B is easy but many contestants misssed the corner case. And C has many corner cases.↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365212),↵
[Comment 2](https://codeforces.me/blog/entry/153617?#comment-1365256),↵
[Comment 3](https://codeforces.me/blog/entry/153617?#comment-1365272)↵
4. **The time limit of D is too tight.**↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365219),↵
[Comment 2](https://codeforces.me/blog/entry/153617?#comment-1365222),↵
[Comment 3](https://codeforces.me/blog/entry/153617?#comment-1365244),↵
[Comment 4](https://codeforces.me/blog/entry/153617?#comment-1365256),↵
[Comment 5](https://codeforces.me/blog/entry/153617?#comment-1365322),↵
[Comment 6](https://codeforces.me/blog/entry/153619?#comment-1365304)↵
5. Problems are too hard.↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365229)↵
6. The samples are weak.↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365238),↵
[Comment 2](https://codeforces.me/blog/entry/153619?#comment-1365327)↵
7. The contest causes a lot of rage.↵
My heart is broken. (;﹏;)↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365256),↵
[Comment 2](https://codeforces.me/blog/entry/153617?#comment-1365224),↵
[Comment 3](https://codeforces.me/blog/entry/153617?#comment-1365371)↵
8. C>>D↵
[Comment 1](https://codeforces.me/blog/entry/153617?#comment-1365371),↵
[Comment 2](https://codeforces.me/blog/entry/153617?#comment-1365371)↵
9. E is AI-solveable.↵
[Comment 1](https://codeforces.me/blog/entry/153619?#comment-1365404)↵
10. E takes too much time and F is so easy.↵
[Comment 1](https://codeforces.me/blog/entry/153619?#comment-1365331)↵
11. C and D are dull implementation and attention exercises.↵
[Comment 1](https://codeforces.me/blog/entry/153777?#comment-1365517)↵
↵
There are still problems unmentioned, but they are enough. I take 4 most seriously. Although 2 seconds can be enough for the best solution, some correct solutions are killed, which obey the principle of problem setting. During testing, D was accepted by different solutions and even $O(n\log n)$ solution can run within 1.1s. Given that, I didn't modify the TL. $If I had set the TL bigger, the contest could reach its expectation.↵
↵
I'm sorry for the weak sample. The $n=2$ in B bothering everyone is intended, but I should have put it in samples at CF. But I didn't even realize C has many corner cases. I set $a$ up to $10^{17}$ to reduce the diffculty. In the original version, $a$ could be up to $10^{10^5}$. Although the corner cases are the necessary parts in the problem, I missed them. Sorry again.↵
↵
We tried our best to capture the cheaters, and you can point them out on your own. I'm sorry for that. They are easy to find, though.↵
↵
Indeed, E should have more scores than F, since it takes more time. I have done the wrong evaluation for the difficulty.↵
↵
I don't want to show CNOI style initially and make the problems easier and easier. I only hoped that problems would be interesting. Some are said to be standard, but I still believe they have the value of thinking. A is easy. B is easy but have corner cases, which is intended. C is not so easy and happens to have many corner cases. TL for D is too tight. Score of E is too low. F is ok but misses the $O(n)$ solution. I have made so many mistakes even after so much testing. I let contestants down, failing to keep my promise. (T_T)↵
↵
I will not author problems any longer until I'm mature enough. I'm guilty and carry this regret from then on. I hope my mistakes serve as a lesson. I have let you down. Sorry...↵
↵
**May love persist?**
