Codeforces Round 1126 (Div. 1, Div. 2)

Revision en8, by efishel, 2026-10-09 06:23:20

¡Buenas, Codeforces!

We are super excited to announce Codeforces Round 1126 (Div. 1, Div. 2), which will start on Oct/11/2026 21:35 (Moscow time) Note the starting time is 4 hours later than the usual. The contest will be split into 2 divisions where you will be given 6 problems and 2 hours to solve them. Some problems will be divided into subtasks.

This round is based on the Mexican Olympiad in Informatics (OMI) 2026. All problems were written and prepared by our team of writers, namely jampm, Francisco_Martin, Teto, SopaconK, Remgagagali727, Marckess, and efishel. We hope you enjoy it and maybe learn something about Mexican culture along the way.

The team would like to thank:

cry for their considerate coordination (and ample basement).

All the testers for their support and great feedback (we love you): SpyrosAliv, AksLolCoding, turska, JoenPoenMan, kevinyang, miniyahirpro, AmShZ, pyoro, Blagoj, br1g, Juanchoki, prvocislo, osvarp, ecnerwala, Argentum47, Keshi, prins, racsosabe, danielrmzkuhn1, 0xor1, temporary1, nik_exists, nifeshe, Edu175, CSQ31.

Alexdat2000 for translating statements.

ocarima et familia, for their many years supporting the Mexican Olympiad in Informatics and pushing us to grow.

MikeMirzayanov & KAN, you know why :)

Muchas gracias

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en36 English efishel 2026-10-11 23:42:51 6239
en35 English efishel 2026-10-11 22:21:34 99
en34 English Marckess 2026-10-11 02:16:46 92
en33 English efishel 2026-10-10 08:13:33 24
en32 English Francisco_Martin 2026-10-10 04:50:48 35 Tiny change: 'eg"></img> no agreges mierdas que no pupil :D' -> 'eg"></img>'
en31 English Francisco_Martin 2026-10-10 04:49:25 6445
en30 English efishel 2026-10-10 04:11:00 184 Tiny change: 'an style="red">4 hours ' -> 'an style="color: red;">4 hours '
en29 English efishel 2026-10-10 03:56:04 5 Tiny change: 't-size: 1.2em;">[user' -> 't-size: 1.15em;">[user'
en28 English efishel 2026-10-10 03:46:32 8 Tiny change: 'ourist,2024-08-31].\n\n<spa' -> 'ourist,2026-10-08].\n\n<spa'
en27 English efishel 2026-10-10 03:43:51 2 Tiny change: ' t#### ¡<em>' -> '#### ¡<em>'
en26 English efishel 2026-10-10 03:42:28 8 Tiny change: '#### ¡<em>' -> ' t#### ¡<em>'
en25 English efishel 2026-10-10 03:24:44 8 Tiny change: 'why :)\n\nAuthors + <a cl' -> 'why :)\n\nWriters + <a cl'
en24 English efishel 2026-10-10 03:24:14 41
en23 English efishel 2026-10-10 03:23:40 233 Tiny change: 'ry/45307).\n\n**Div.' -> 'ry/45307). [contest:2273]\n\n**Div.'
en22 English efishel 2026-10-10 02:23:15 145
en21 English efishel 2026-10-10 02:08:07 4
en20 English efishel 2026-10-10 02:06:13 95
en19 English efishel 2026-10-10 02:00:35 0 (published)
en18 English efishel 2026-10-10 02:00:11 47
en17 English efishel 2026-10-10 01:59:37 4 Tiny change: ' Round 1126](https://' -> ' Round 1127](https://'
en16 English efishel 2026-10-10 01:56:30 5
en15 English efishel 2026-10-10 01:54:40 45
en14 English efishel 2026-10-10 01:53:36 214 Tiny change: 'E | F |\n| Div. ' -> 'E | F |\n|---|---|---|---|---|---|---|\n| Div. '
en13 English efishel 2026-10-09 08:21:11 138
en12 English efishel 2026-10-09 07:51:48 74 Tiny change: ':jampm,2026-10-7], [user:F' -> ':jampm,2023-03-29], [user:F'
en11 English efishel 2026-10-09 07:06:31 27 Tiny change: '026-10-08].\n\n[use' -> '026-10-08], [user:tourist,2024-08-30].\n\n[use'
en10 English efishel 2026-10-09 06:53:51 77 Tiny change: 'orces!\n\nWe are' -> 'orces!\n\n![ ](http://imgur.com/a/0MJU636)\n\nWe are'
en9 English efishel 2026-10-09 06:46:20 120 Tiny change: 'e: 1.5em;" [user:cry,' -> 'e: 1.5em;">[user:cry,'
en8 English efishel 2026-10-09 06:23:20 143 Tiny change: 'oy it.\n\nThe team w' -> 'oy it.\n\n### The team w'
en7 English efishel 2026-10-09 05:36:30 184 Tiny change: 'time is **4** hours l' -> 'time is **_4_** hours l'
en6 English efishel 2026-10-09 05:16:31 150
en5 English efishel 2026-10-09 05:12:27 720 Tiny change: '024-10-11], [user:Marckess,2024-10-11]' -> '024-10-11]'
en4 English efishel 2026-10-09 03:51:55 277 Tiny change: ' 2026.\n![ ](https://' -> ' 2026.\n![hey](https://'
en3 English efishel 2026-10-08 23:56:21 59
en2 English efishel 2026-10-08 23:54:09 332
en1 English efishel 2026-10-08 09:34:15 1220 Initial revision (saved to drafts)