AFOI 2025 & AFO OI Round 1 Announcement
Difference between en7 and en8, changed 2 character(s)
Hello Codeforces!↵
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We will hold [AFOI 2025 & AFO OI Round 1](https://www.luogu.com.cn/contest/305608) on [Luogu](https://www.luogu.com.cn). This is a rated unofficial contest. English statement will not be provided. yYou may use AI for translation.↵
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**Note that we do not guarantee that the problems are arranged in increasing order of difficulty.**↵
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- Start time: June 6 13:00 (UTC+8)↵
- Duration: 4.5 hours↵
- System: IOI↵
- Difficulty: similar to CF div.2↵
- Coordinator: [user:Gold14526,2026-05-25]↵
- Writers: s4CRIF1CbUbbL3AtIAly, [user:Tian36309,2026-05-25], [user:CRH826,2026-05-25], [user:ink65536,2026-05-25], [user:OierTSN,2026-05-25], [user:Recall_cpp,2026-05-25]↵
- Testers: [user:liyuteng200909,2026-05-25], [user:ink65536,2026-05-25], [user:Tian36309,2026-05-25], [user:AeeE5x,2026-05-25], [user:CRH826,2026-05-25]↵
- Rated range: [0,2000] on Luogu↵
- Score distribution: (50+50)+100+100+100+100+100↵
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We are looking forward to your participation!↵
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Fun fact: all the problems have names that appeared in CNOI official contests in 2025.↵
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-   [A tutorial on using Luogu](https://mirror.codeforces.com/blog/entry/131261) (Please note that `#pragma GCC optimize` is temporarily banned for some reason on Luogu.)↵
-   [A brief introduction to Chinese NOI](https://mirror.codeforces.com/blog/entry/131266)↵

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en10 English CRH826 2026-05-25 16:56:17 5 Tiny change: 'e contact with [user:CRH' -> 'e contact [user:CRH'
en9 English CRH826 2026-05-25 16:55:26 179
en8 English CRH826 2026-05-25 16:44:54 2 Tiny change: 'provided. you may use' -> 'provided. You may use'
en7 English CRH826 2026-05-25 16:38:07 0 (published)
en6 English CRH826 2026-05-25 16:36:31 1 Tiny change: 'v.2\n- Coodinator: [' -> 'v.2\n- Coordinator: ['
en5 English CRH826 2026-05-25 15:28:18 9 Tiny change: 'art time: 06.06 13:00 (U' -> 'art time: June 6 13:00 (U'
en4 English CRH826 2026-05-25 15:24:53 2 Tiny change: 'e provided, you may u' -> 'e provided. you may u'
en3 English CRH826 2026-05-25 15:24:24 8
en2 English CRH826 2026-05-25 15:20:47 22 Tiny change: ' Writers: [user:Tia' -> ' Writers: s4CRIF1CbUbbL3AtIAly, [user:Tia'
en1 English CRH826 2026-05-25 15:20:05 1329 Initial revision (saved to drafts)