Codeforces Round 1127 (Div. 1, Div. 2)

Revision en17, by efishel, 2026-10-10 01:59:37

¡Buenas, Codeforces!

We are super excited to announce Codeforces Round 1127 (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.

Div. 1 score distribution: $$$500 - 1000 - 1250 - 2000 - 2250 - 3500$$$

Div. 2 score distribution: $$$500 - 1250 - 1250 - 1750 - 2000 - 3000$$$

This round is based on the Mexican Olympiad in Informatics (OMI) 2026. All problems were written and prepared by our team of pupils, aka 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 these pupils, aka 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, tourist.

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 :)

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)