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Codeforces is a Russian website dedicated to competitive programming. It was created and is maintained by a group of competitive programmers from Saratov State University led by Mikhail Mirzayanov. Since 2013, Codeforces has surpassed Topcoder in term of active contestants [1][2]. Codeforces Round #Pi (Div. 2) contest broke all records in term of registrants: 6278.


Codeforces provides to all users following main services:

  • participation in the short (2-hours) contests, so-called "Codeforces Rounds", held about once a week;
  • challenge/hack other contestants solutions;
  • ability to solve problems from previous contests for training purposes;
  • "polygon" for creating and testing problems;
  • kind of social-networking by using of internal public blogs.

Contestants are rated by system similar to ELO. There are usually no prizes for winners, though 100 winners of 100-th Codeforces Round received a T-Shirt. Some bigger contests (mostly country internal) are hosted on Codeforces base, among them "Yandex Algorithm 2011", provided by Yandex - one of biggest Russian IT-companies.


First Codeforces Round was held on the February 19 in 2010 with 175 participants. As of end of January 2012 over 100 rounds were held, with usual number of registrants over 2000 [3]. Before 2012 Codeforces Round were titled "Codeforces Beta Rounds" which means that development phase is still on. However development of interconnected facilities, like trainings, virtual contests, new blog and interface features etc.

Contests Hosted by Codeforces[edit]

Some bigger contests are hosted on Codeforces base, among them:

1. Yandex.Algorithm Contest 2011 and 2013

2. Russian Code Cup 2014 and 2015

3. ABBYY Cup

4. CROC Contest

5. MemSQL start[c]up

6. VK Cup 2012 and 2015

7. Bayan Programming Contest 2012/2013 and 2015

8. Manthan 2011

9. Rockethon 2014 and 2015

10. Coder-Strike 2014

11. Zepto Code Rush 2014 and 2015

12. GridGames