Boss-problem: https://codeforces.me/contest/2211/problem/E

check what time it took to solve E and F. F was easy for llm(it can be solved by free chatgpt version) E was hard back then even for frontier llms. I made a list ages ago and some of users already got banned. I look for TL 30 subs mostly. Almost all TL30 submissions from cheaters are identical, with only the variable names changed. Feel free to investigate it yourself!

1. RockyYue 368584889
2. XorGhost 368543854
3. Nischaya008 368546936
4. ayingna 368552115
5. anuragthakur1089 368558531
6. sahilsingh177 368572320
7. Pain850 368572876
8. FLY_lai 368574092
9. geospiza 368574339
10. codingforenjoy 368574470
11. lcyxds 368575924
12. niwrad 368578555
13. akramnasiri73 368579842
14. Baraa-Ahmed 368580217
15. 504Timeout 368580377
16. Hydrotherapy 368581104
17. onlyfanz 368581832
18. hushuqi_qwq 368582802
19. NanYan 368583347
20. NotDWT 368584424
21. A10ne 368584754
22. SpadeZ 368587088
23. lihaochen 368587327.
24. FableWeaver 368587327.
25. GreedyButWrong 368588367
26. Lol2004 368588466.
27. aaa_Pigeon2 368591012
28. Popusk3000lvl 368590516
29. ggorelov_why 368591879
30. Baskot 368594763
31. aarav1118122 368595025
32. Michael_Kravets 368593717
33. thomaswmy 368589221

Some interesting cases:

1st LGM thomaswmy
https://codeforces.me/submissions/thomaswmy/contest/2211 Solved F in 6 min.

2nd LGM. NanYan
https://codeforces.me/submissions/NanYan/contest/2211 Got banned on Atcoder. Won prizes in official cf rounds. Solved F in 21 min. Sent CE sub twice. Struggled with E.

3rd IGM RockyYue Got banned on atcoder. Solved F in 13 min.
https://codeforces.me/submissions/RockyeYue/contest/2211 Won prizes in codeforces. Before chat gpt 5 release was hard stuck 2000 elo.

4th IGM FLY_lai Solved F in 8 min.
https://codeforces.me/submissions/FLY_lai/contest/2211 Won prizes in codeforces. Before chat gpt 5 release was hard stuck 2000 elo.

5th IGM geospiza.
https://codeforces.me/submissions/geospiza/contest/2211 Tested some rounds. Was hard stuck 2000 elo before chatgpt5 release.(even with 2k+ problem solved). Solved F in 11 min.

6th IGM XorGhost.
https://codeforces.me/submissions/XorGhost/contest/2211 First TL 30 sub for E. Solved F in 31 min.(he is smart one yes)

7th IGM aaa_Pigeon2.
Author of the next div1 contest. My comment should be enough.