Hello 2026
Difference between en40 and en41, changed 70 character(s)
Happy new year, Codeforces!↵
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We are glad to invite you to take part in [contest:2183], which will start on [contest_time:2183]. You will be given **9 problems** and **3 hours** to solve them. **At least one problem will be interactive**, so please make sure to read the [guide for interactive problems](https://codeforces.me/blog/entry/45307) before the contest. This round is open and rated for everyone.↵
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Problems are authored by [user:wangmarui,2025-12-23], [user:Gold14526,2025-12-23], [user:Hoks_,2025-12-23], [user:Neil_Qian,2025-12-23], [user:Network_Error,2025-12-23], [user:jiazhichen844,2025-12-23] and [user:xvchongyv,2025-12-23].↵
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We would like to thank:↵
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-   [user:Um_Nik,2025-12-23] for pre-reviewing the round.↵
-   [user:Proof_by_QED,2025-12-23] for his wonderful coordination.↵
-   [user:Alexdat2000,2025-12-23] for Russian translation.↵
-   [user:Geothermal,2025-12-23], [user:StarSilk,2025-12-23], and [user:Dominater069,2025-12-23] for nutella testing.↵
-   [user:Mindeveloped,2025-12-23], [user:ETO_leader,2025-12-23], [user:nldr,2025-12-29], [user:max0810,2025-12-23], [user:A_G,2025-12-23], [user:_istil,2025-12-23], [user:ian_HLX,2025-12-23], [user:nifeshe,2025-12-23], [user:paulzrm,2025-12-23], [user:sammyuri,2025-12-23], [user:catgirl,2025-12-23] and [user:Intellegent,2025-12-23] for red testing.↵
-   [user:cuteSubtask,2025-12-23], [user:LucaLucaM,2025-12-23], [user:cry,2025-12-23], [user:Genius_Star_rgw,2025-12-23], [user:Friedrich,2025-12-23], [user:incra,2025-12-29], [user:lkrqwq,2025-12-23], [user:LaDeX,2025-12-23], [user:pichax,2025-12-23], [user:shiny_shine,2025-12-23], [user:efishel,2025-12-23], [user:Edeeva,2025-12-30], [user:Register,2025-12-23], [user:AksLolCoding,2025-12-23], [user:Watersphere,2025-12-23], [user:Lilypad,2025-12-23], [user:tzl_Dedicatus545,2025-12-23], [user:Caylex,2025-12-23] and [user:waauto,2025-12-23] for yellow testing.↵
-   [user:NATO,2025-12-23], [user:Cfz_qwq,2025-12-23], [user:MagentaCobra,2025-12-23], [user:gza,2025-12-29], [user:wuhudsm,2025-12-23], [user:madlogic,2025-12-23] and [user:Heartquake,2025-12-23] for purple testing.↵
-   [user:tybbs,2025-12-23], [user:larush,2025-12-23], [user:pianapolataa,2025-12-23], [user:Terminator-XII,2025-12-23], [user:hollis_yang,2025-12-23], [user:Nukumizu-Anna,2025-12-23], [user:shengxuanyi,2025-12-23], [user:chromate00,2025-12-23] and [user:cby_,2025-12-23] for blue testing.↵
-   [user:wizardMarshall,2025-12-23], [user:Solwek,2025-12-23], [user:sztcodeforces,2025-12-23] and [user:lottle1212,2025-12-23] for cyan testing.↵
-   [user:yaotianhao0906,2025-12-23], [user:lovelyfish,2025-12-24] and [user:YSY_,2025-12-23] for green testing.↵
-   [user:chenzhishuo2012,2025-12-23] and [user:doraimota,2025-12-23] for gray testing.↵
-   [user:Lynette_D,2025-12-23] for unrated 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: $500 - 1000 - 1500 - (1000 - 2000) - 2250 - 2750 - 4000 - 4000 - (4500 - 1000)$↵
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Good Luck & Have Fun!↵
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**EDIT**Update 1: The score distribution have been changed a bit. In particular, problem I will be split into two subtasks.↵
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Update 2: Hacks will be disabled on problems A-D.

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en44 English wangmarui 2026-01-07 22:08:37 0 (published)
en43 English wangmarui 2026-01-07 22:08:16 375 (saved to drafts)
en42 English Proof_by_QED 2026-01-07 21:22:09 72
en41 English wangmarui 2026-01-07 17:01:15 70
en40 English Proof_by_QED 2026-01-04 06:42:03 127
en39 English Proof_by_QED 2026-01-03 12:17:03 2
en38 English Proof_by_QED 2026-01-03 12:16:22 57
en37 English Proof_by_QED 2026-01-03 08:23:37 90
en36 English Proof_by_QED 2026-01-03 08:22:15 227 Tiny change: 'stime:2083. You will' -> 'stime:2083]. You will'
en35 English wangmarui 2026-01-03 03:36:10 0 (published)
en34 English wangmarui 2026-01-03 03:35:26 2 Tiny change: ' - 4000 - 5000$\n\nGoo' -> ' - 4000 - 4500$\n\nGoo'
en33 English wangmarui 2026-01-03 03:35:03 6
en32 English wangmarui 2026-01-02 10:40:34 2 Tiny change: ',2025-12-28] and [use' -> ',2025-12-24] and [use'
en31 English wangmarui 2026-01-02 10:38:20 2 Tiny change: ',2025-12-23] and [use' -> ',2025-12-28] and [use'
en30 English wangmarui 2026-01-02 10:35:17 5 Tiny change: '6 at 22:35UTC+8](https://' -> '6 at 22:35](https://'
en29 English wangmarui 2026-01-02 10:28:21 132
en28 English wangmarui 2026-01-02 10:26:55 15 Reverted to en26
en27 English wangmarui 2026-01-02 10:24:58 15 Tiny change: 'Hello, Codeforc' -> 'Happy new year, Codeforc'
en26 English Proof_by_QED 2026-01-02 10:23:39 46
en25 English wangmarui 2026-01-02 10:19:32 32 Tiny change: '3], [user:MagentaCobra,2025-12-23], [user:' -> '3], [user:'
en24 English wangmarui 2026-01-02 10:18:05 30 Tiny change: '025-12-23]' -> '025-12-23], [user:lovelyfish,2025-12-23]'
en23 English wangmarui 2026-01-02 10:16:15 32 Tiny change: '- [user:ETO' -> '- [user:Mindeveloped,2025-12-23], [user:ETO'
en22 English wangmarui 2026-01-02 10:14:49 27
en21 English wangmarui 2026-01-02 10:14:11 54 Tiny change: '- [user:' -> '- [user:Lynette_D,2025-12-23] for unrated testing.\n- [user:'
en20 English wangmarui 2026-01-02 10:12:00 79
en19 English wangmarui 2026-01-02 10:08:35 122
en18 English wangmarui 2026-01-02 10:07:42 717
en17 English wangmarui 2026-01-02 10:00:23 507
en16 English wangmarui 2026-01-02 09:54:40 31 Tiny change: '- [user:Luc' -> '- [user:cuteSubtask,2025-12-23], [user:Luc'
en15 English wangmarui 2026-01-02 09:54:10 12 Tiny change: '3], [user:Register,2025-12-2' -> '3], [user:Heartquake,2025-12-2'
en14 English wangmarui 2026-01-02 09:53:28 29 Tiny change: '- [user:Gen' -> '- [user:LucaLucaM,2025-12-23], [user:Gen'
en13 English wangmarui 2026-01-02 09:52:51 31
en12 English wangmarui 2026-01-02 09:51:32 464
en11 English wangmarui 2026-01-02 09:47:15 8
en10 English wangmarui 2026-01-02 09:45:29 848
en9 English wangmarui 2026-01-02 09:37:13 2 Tiny change: ',2025-12-23], [user:A' -> ',2025-12-29], [user:A'
en8 English wangmarui 2026-01-02 09:36:41 515
en7 English wangmarui 2026-01-02 09:29:05 136
en6 English wangmarui 2026-01-02 09:28:04 194
en5 English wangmarui 2026-01-02 09:25:53 118
en4 English wangmarui 2026-01-02 09:25:10 242
en3 English wangmarui 2026-01-02 09:19:02 54
en2 English wangmarui 2026-01-02 09:18:33 1 Tiny change: 'e part in Hello 2026' -> 'e part in [Hello 2026'
en1 English wangmarui 2026-01-02 09:17:31 4163 Initial revision (saved to drafts)