Codeforces Round #507 (based on Olympiad of Metropolises)

Revision en7, by cdkrot, 2018-09-06 01:24:40

Hi everybody!

These days Moscow is conducting the 3rd International Olympiad of Metropolises that is an international competition for high school students from biggest cities and capitals all around the world. One of the disciplines of the competition is informatics. Rounds of the competition were prepared by the jury members invited from St. Petersburg, Minsk, Belgrade and Moscow olympiad scientific committee which you may know by Moscow team Olympiad, Open Olympiad in Informatics and Moscow Olympiad for young students (rounds 327, 342, 345, 376, 401, 433, 441, 466, 469).

Scientific Committee of the olympiad consists of: darnley, Endagorion, Jelena Hadži-Purić, Elena Andreeva, Zlobober, GlebsHP. The problems were developed by kraskevich, ch_egor, cdkrot, Schemtschik, GoToCoding, malcolm, akvasha, darnley, wrg0ababd, achulkov2, vintage_Vlad_Makeev under the guidance of GlebsHP and Zlobober.

Problems were adapted for codeforces by KAN and cdkrot, also thanks for MikeMirzayanov for systems codeforces and polygon, which was used to prepare problems of this olympiad. Also, thanks LHiC and V--o_o--V for testing!

Good luck and high ratings for everybody!

Round will happen on Sep/05/2018 19:35 (Moscow time) and will last for two hours. There will be 5 problems for each division.

P.S. We kindly ask everybody who knows problems of an onsite event not to participate in a round and not to discuss them in public, as this may be a subject for disqualification.

Upd: Editorial was published here!

Aaaand congratulations to winners!


  1. Um_nik
  2. 300iq
  3. webmaster
  4. ksun48
  5. Anadi


  2. gosuto
  3. Onjo
  4. sturdyplum
  5. LYJabc


  Rev. Lang. By When Δ Comment
en7 English cdkrot 2018-09-06 01:24:40 22
ru4 Russian cdkrot 2018-09-06 01:24:15 439
en6 English cdkrot 2018-09-06 01:22:25 440
ru3 Russian cdkrot 2018-09-05 19:09:08 114
en5 English cdkrot 2018-09-05 19:07:07 111
en4 English cdkrot 2018-09-04 17:54:09 4 Tiny change: 'cting the 2nd Internat' -> 'cting the 3rd Internat'
en3 English cdkrot 2018-09-04 16:33:43 294
en2 English cdkrot 2018-09-04 14:42:02 59
ru2 Russian cdkrot 2018-09-04 14:40:36 106
en1 English cdkrot 2018-09-04 14:38:42 2680 Initial revision for English translation
ru1 Russian cdkrot 2018-09-04 14:28:52 2230 Первая редакция (опубликовано)