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Codeforces is a Russian website dedicated to competitive programming. It was created and is maintained by group of sportsmen from Saratov State University led by Mikhail Mirzayanov. Since 2013, Codeforces has surpassed Topcoder in term of active contestants . Good Bye 2014 contest broke all record in term of registrations: 6274.
Codeforces provides to all users following main services:
- participation in the short (2-hours) contests, so-called "Codeforces Rounds", held about once a week;
- 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 . 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
Some bigger contests are hosted on Codeforces base, among them:
1. Yandex.Algorithm Contest
2. Russian Code Cup
3. ABBYY Cup
4. CROC Contest
5. MemSQL start[c]up
6. VK Cup 2012
7. Bayan Programming Contest 2012/2013
8. Manthan 2011
9. Rockethon Announcement 2014
10. Coder-Strike 2014
11. Zepto Code Rush 2014