Codeforces Round 1105 (Div. 1, Div. 2)
Difference between en6 and en7, changed 281 character(s)
#### 你好，Codeforces!↵
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We are delighted to invite you to participate in [Codeforces Round 1105 (Div. 1)](https://codeforces.me/contest/2238) or [Codeforces Round 1105 (Div. 2)](https://codeforces.me/contest/2239),which will be held on [Saturday, June 27, 2026 at 22:35UTC+8](https://www.timeanddate.com/worldclock/fixedtime.html?day=27&month=6&year=2026&hour=17&min=35&sec=0&p1=166).↵
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For both division 1 ans division 2, you will be given **$2.5$ hours** to solve **$6$ problems**.↵
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The scoring distribution will be announced later.↵
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The problems were authored and prepared by [user:Gold14526,2026-06-22], [user:Milkcat2009,2026-06-22] and [user:wangmarui,2026-06-22].↵
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We would really like to thank the following people for making this round possible:↵
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- [user:cadmiumky,2026-06-22] for the great coordination.↵
- [user:hcywoi,2026-06-22] and [user:Network_Error,2026-06-22] who also prepared problems that were ultimately not used in this round.↵
- [user:lkrqwq,2026-06-22] for optimizing many details of problems.↵
- [user:errorgorn,2026-06-22] for black red testing.↵
- [user:Network_Error,2026-06-22], [user:StelIawinD,2026-06-22], [user:_istil,2026-06-22], [user:jiazhichen844,2026-06-22], [user:ETO_leader,2026-06-22], [user:Dragos,2026-06-22], [user:MtSaka,2026-06-22], [user:Caylex,2026-06-22], [user:nifeshe,2026-06-22], [user:rolandpetrean,2026-06-22] for red testing.↵
- [user:Proof_by_QED,2026-06-22], [user:lkrqwq,2026-06-22], [user:Watersphere,2026-06-22], [user:Timosh,2026-06-22], [user:tzl_Dedicatus545,2026-06-22], [user:0x0002,2026-06-22], [user:a_little_cute,2026-06-22], [user:morandyg,2026-06-22], [user:abruce,2026-06-22], [user:programpiggy,2026-06-22] for yellow testing.↵
- [user:MornStar,2026-06-22], [user:Ns6Juruo,2026-06-22] for purple testing.↵
- [user:cybher,2026-06-22], [user:zhouyitao123,2026-06-22], [user:Nyemot,2026-06-22], [user:Pie_TealCompressorDragon,2026-06-22] for blue testing.↵
- [user:xiaohaoaibiancheng666,2026-06-22] for cyan testing.↵
- [user:NSZBD_dklmq_12,2026-06-22] for green testing.↵
- [user:NanguX,2026-06-22] for gray testing.↵
- [user:MikeMirzayanov,2025-12-23] and [user:KAN,2025-12-23] for the great Codeforces and Polygon platforms.↵
- <a class="rated-user user-legendary" href="https://codeforces.me/profile/">You</a> for participating in this round.↵
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Score Distribution: $$↵
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Good Luck & Have Fun!

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en20 English cadmiumky 2026-06-29 14:21:04 63
en19 English cadmiumky 2026-06-27 20:25:50 78
en18 English cadmiumky 2026-06-26 10:28:42 62
en17 English cadmiumky 2026-06-25 19:25:06 6 Tiny change: 'ontest:2238] or [contest:2238], both of' -> 'ontest:2239] or [contest:2240], both of'
en16 English cadmiumky 2026-06-25 19:24:33 6 Tiny change: 'ontest:2239] or [contest:2240], both of' -> 'ontest:2238] or [contest:2238], both of'
en15 English cadmiumky 2026-06-25 19:20:47 2
en14 English cadmiumky 2026-06-25 17:49:01 383
en13 English cadmiumky 2026-06-25 17:40:45 2
en12 English cadmiumky 2026-06-24 12:27:36 2 Tiny change: 'ution: **TDB**\n\nGood' -> 'ution: **TBD**\n\nGood'
en11 English Gold14526 2026-06-23 02:19:15 31 Tiny change: '\n- [user:err' -> '\n- [user:Starsilk] and [user:err'
en10 English cadmiumky 2026-06-22 16:32:07 68
en9 English Gold14526 2026-06-22 12:44:47 266 Tiny change: 't_time:2238].\n\nFor ' -> 't_time:2239].\n\nFor '
en8 English wangmarui 2026-06-22 11:48:40 2 Tiny change: 'ribution: $$\n\nGood L' -> 'ribution: \n\nGood L'
en7 English wangmarui 2026-06-22 11:47:07 281 (published)
en6 English Milkcat2009 2026-06-22 09:29:18 3 Tiny change: 'ser:errorgan,2026-06-' -> 'ser:errorgorn,2026-06-'
en5 English Milkcat2009 2026-06-22 09:28:58 53 Tiny change: '\n- [user:' -> '\n- [user:errorgan,2026-06-22] for black red testing.\n- [user:'
en4 English Milkcat2009 2026-06-22 09:26:33 1 Tiny change: 'ivision 2,you will b' -> 'ivision 2, you will b'
en3 English Milkcat2009 2026-06-22 09:20:51 1012
en2 English Gold14526 2026-06-22 09:12:49 67 Tiny change: 'ound.\n- []' -> 'ound.\n- [user:lkrqwq] for optimizing many details of problems.\n- '
en1 English Gold14526 2026-06-22 09:08:01 1001 Initial revision (saved to drafts)