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!**↵
↵
0. [user:RockyYue,2026-07-21] [368584889](https://codeforces.me/contest/2211/submission/368584889)↵
1. [user:XorGhost,2026-07-21] [368543854](https://codeforces.me/contest/2211/submission/368543854)↵
2. [user:Nischaya008,2026-07-21] [368546936](https://codeforces.me/contest/2211/submission/368546936)↵
3. [user:ayingna,2026-07-21] [368552115](https://codeforces.me/contest/2211/submission/368552115)↵
4. [user:anuragthakur1089,2026-07-21] [368558531](https://codeforces.me/contest/2211/submission/368558531)↵
5. [user:sahilsingh177,2026-07-21] [368572320](https://codeforces.me/contest/2211/submission/368572320)↵
6. [user:Pain850,2026-07-21] [368572876](https://codeforces.me/contest/2211/submission/368572876)↵
7. [user:FLY_lai,2026-07-21] [368574092](https://codeforces.me/contest/2211/submission/368574092)↵
8. [user:geospiza,2026-07-21] [368574339](https://codeforces.me/contest/2211/submission/368574339)↵
9. [user:codingforenjoy,2026-07-21] [368574470](https://codeforces.me/contest/2211/submission/368574470)↵
10. [user:lcyxds,2026-07-21] [368575924](https://codeforces.me/contest/2211/submission/368575924)↵
11. [user:niwrad,2026-07-21] [368578555](https://codeforces.me/contest/2211/submission/368578555)↵
12. [user:akramnasiri73,2026-07-21] [368579842](https://codeforces.me/contest/2211/submission/368579842)↵
13. [user:Baraa-Ahmed,2026-07-21] [368580217](https://codeforces.me/contest/2211/submission/368580217)↵
14. [user:504Timeout,2026-07-21] [368580377](https://codeforces.me/contest/2211/submission/368580377)↵
15. [user:Hydrotherapy,2026-07-21] [368581104](https://codeforces.me/contest/2211/submission/368581104)↵
16. [user:onlyfanz,2026-07-21] [368581832](https://codeforces.me/contest/2211/submission/368581832)↵
17. [user:hushuqi_qwq,2026-07-21] [368582802](https://codeforces.me/contest/2211/submission/368582802)↵
18. [user:NanYan,2026-07-21] [368583347](https://codeforces.me/contest/2211/submission/368583347)↵
19. [user:NotDWT,2026-07-21] [368584424](https://codeforces.me/contest/2211/submission/368584424)↵
20. [user:A10ne,2026-07-21] [368584754](https://codeforces.me/contest/2211/submission/368584754)↵
21. [user:SpadeZ,2026-07-21] [368587088](https://codeforces.me/contest/2211/submission/368587088)↵
22. [user:lihaochen,2026-07-21] [368587327](https://codeforces.me/contest/2211/submission/368587327).↵
23. [user:FableWeaver,2026-07-21] [368587327](https://codeforces.me/contest/2211/submission/368587327).↵
24. [user:GreedyButWrong,2026-07-21] [368588367](https://codeforces.me/contest/2211/submission/368588367)↵
25. [user:Lol2004,2026-07-21] [368588466](https://codeforces.me/contest/2211/submission/368588466).↵
26. [user:aaa_Pigeon2,2026-07-21] [368591012](https://codeforces.me/contest/2211/submission/368591012)↵
27. [user:Popusk3000lvl,2026-07-21] [368590516](https://codeforces.me/contest/2211/submission/368590516)↵
28. [user:ggorelov_why,2026-07-21] [368591879](https://codeforces.me/contest/2211/submission/368591879)↵
29. [user:Baskot,2026-07-21] [368594763](https://codeforces.me/contest/2211/submission/368594763)↵
30. [user:aarav1118122,2026-07-21] [368595025](https://codeforces.me/contest/2211/submission/368595025)↵
31. [user:Michael_Kravets,2026-07-21] [368593717](https://codeforces.me/contest/2211/submission/368593717)↵
32. [user:thomaswmy,2026-07-21] [368589221](https://codeforces.me/contest/2211/submission/368589221)↵
↵
Some interesting cases:↵
↵
1st LGM [user:thomaswmy,2026-07-21] ↵
https://codeforces.me/submissions/thomaswmy/contest/2211↵
Solved F in 6 min. ↵
↵
2nd LGM. [user:NanYan,2026-07-21] ↵
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 [user:RockyYue,2026-07-21] 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 [user:FLY_lai,2026-07-21] 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 [user:geospiza,2026-07-21]. ↵
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 [user:XorGhost,2026-07-21]. ↵
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 [user:aaa_Pigeon2,2026-07-21]. ↵
Author of the next div1 contest. My [comment](https://codeforces.me/blog/entry/153468#comment-1366829) should be enough.↵
↵
↵
↵
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!**↵
↵
0. [user:RockyYue,2026-07-21] [368584889](https://codeforces.me/contest/2211/submission/368584889)↵
1. [user:XorGhost,2026-07-21] [368543854](https://codeforces.me/contest/2211/submission/368543854)↵
2. [user:Nischaya008,2026-07-21] [368546936](https://codeforces.me/contest/2211/submission/368546936)↵
3. [user:ayingna,2026-07-21] [368552115](https://codeforces.me/contest/2211/submission/368552115)↵
4. [user:anuragthakur1089,2026-07-21] [368558531](https://codeforces.me/contest/2211/submission/368558531)↵
5. [user:sahilsingh177,2026-07-21] [368572320](https://codeforces.me/contest/2211/submission/368572320)↵
6. [user:Pain850,2026-07-21] [368572876](https://codeforces.me/contest/2211/submission/368572876)↵
7. [user:FLY_lai,2026-07-21] [368574092](https://codeforces.me/contest/2211/submission/368574092)↵
8. [user:geospiza,2026-07-21] [368574339](https://codeforces.me/contest/2211/submission/368574339)↵
9. [user:codingforenjoy,2026-07-21] [368574470](https://codeforces.me/contest/2211/submission/368574470)↵
10. [user:lcyxds,2026-07-21] [368575924](https://codeforces.me/contest/2211/submission/368575924)↵
11. [user:niwrad,2026-07-21] [368578555](https://codeforces.me/contest/2211/submission/368578555)↵
12. [user:akramnasiri73,2026-07-21] [368579842](https://codeforces.me/contest/2211/submission/368579842)↵
13. [user:Baraa-Ahmed,2026-07-21] [368580217](https://codeforces.me/contest/2211/submission/368580217)↵
14. [user:504Timeout,2026-07-21] [368580377](https://codeforces.me/contest/2211/submission/368580377)↵
15. [user:Hydrotherapy,2026-07-21] [368581104](https://codeforces.me/contest/2211/submission/368581104)↵
16. [user:onlyfanz,2026-07-21] [368581832](https://codeforces.me/contest/2211/submission/368581832)↵
17. [user:hushuqi_qwq,2026-07-21] [368582802](https://codeforces.me/contest/2211/submission/368582802)↵
18. [user:NanYan,2026-07-21] [368583347](https://codeforces.me/contest/2211/submission/368583347)↵
19. [user:NotDWT,2026-07-21] [368584424](https://codeforces.me/contest/2211/submission/368584424)↵
20. [user:A10ne,2026-07-21] [368584754](https://codeforces.me/contest/2211/submission/368584754)↵
21. [user:SpadeZ,2026-07-21] [368587088](https://codeforces.me/contest/2211/submission/368587088)↵
22. [user:lihaochen,2026-07-21] [368587327](https://codeforces.me/contest/2211/submission/368587327).↵
23. [user:FableWeaver,2026-07-21] [368587327](https://codeforces.me/contest/2211/submission/368587327).↵
24. [user:GreedyButWrong,2026-07-21] [368588367](https://codeforces.me/contest/2211/submission/368588367)↵
25. [user:Lol2004,2026-07-21] [368588466](https://codeforces.me/contest/2211/submission/368588466).↵
26. [user:aaa_Pigeon2,2026-07-21] [368591012](https://codeforces.me/contest/2211/submission/368591012)↵
27. [user:Popusk3000lvl,2026-07-21] [368590516](https://codeforces.me/contest/2211/submission/368590516)↵
28. [user:ggorelov_why,2026-07-21] [368591879](https://codeforces.me/contest/2211/submission/368591879)↵
29. [user:Baskot,2026-07-21] [368594763](https://codeforces.me/contest/2211/submission/368594763)↵
30. [user:aarav1118122,2026-07-21] [368595025](https://codeforces.me/contest/2211/submission/368595025)↵
31. [user:Michael_Kravets,2026-07-21] [368593717](https://codeforces.me/contest/2211/submission/368593717)↵
32. [user:thomaswmy,2026-07-21] [368589221](https://codeforces.me/contest/2211/submission/368589221)↵
↵
Some interesting cases:↵
↵
1st LGM [user:thomaswmy,2026-07-21] ↵
https://codeforces.me/submissions/thomaswmy/contest/2211↵
Solved F in 6 min. ↵
↵
2nd LGM. [user:NanYan,2026-07-21] ↵
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 [user:RockyYue,2026-07-21] 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 [user:FLY_lai,2026-07-21] 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 [user:geospiza,2026-07-21]. ↵
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 [user:XorGhost,2026-07-21]. ↵
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 [user:aaa_Pigeon2,2026-07-21]. ↵
Author of the next div1 contest. My [comment](https://codeforces.me/blog/entry/153468#comment-1366829) should be enough.↵
↵
↵
