Hello 2026 - Codeforces

#	User	Rating
1	Benq	3676
2	jiangly	3670
3	Kevin114514	3657
4	maroonrk	3355
5	Um_nik	3353
6	squareOf105	3346
7	tourist	3343
8	strapple	3324
9	heuristica	3322
10	jiangbowen	3291

#	User	Contrib.
1	Qingyu	158
2	nik_exists	150
2	maspy	150
4	AmShZ	143
4	Um_nik	143
6	Errichto	139
7	adamant	137
8	BledDest	134
9	maroonrk	133
10	qwexd	130

Happy new year, Codeforces!↵
↵
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.↵
↵
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].↵
↵
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.↵
↵
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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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.↵
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Update 3: editorial — https://codeforces.me/blog/entry/149944↵
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Update 4: Congratulations to the winners!↵
↵
1. [user:maroonrk,2025-12-23]↵
2. [user:ecnerwala,2025-12-23]↵
3. [user:turmax,2025-12-23]↵
4. [user:peti1234,2025-12-23]↵
5. [user:kotatsugame,2025-12-23]↵
6. [user:hos.lyric,2025-12-23]↵
7. [user:BurnedChicken,2025-12-23]↵
8. [user:strapple,2025-12-23]↵
9. [user:stepanov.aa,2025-12-23]↵
10. [user:antontrygubO_o,2025-12-23]

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

History