Codeforces

About

Codeforces is a prominent online platform dedicated to competitive programming, offering a range of features that cater to programmers worldwide. It was launched in 2009 by Mikhail Mirzayanov and is maintained by a team from ITMO University. The platform hosts regular contests, known as "Codeforces Rounds," which are typically two hours long and occur weekly. Additionally, it offers educational contests with a hacking period, allowing participants to challenge each other's solutions. Codeforces also provides a "Polygon" system for creating and testing problems, making it a valuable resource for both contestants and problem setters. Codeforces has a large global community, with over 1.6 million registered users as of its 15th anniversary. It supports both English and Russian languages, making it accessible to a broad audience. The platform uses a rating system similar to the Elo rating system, dividing contestants into ranks based on their performance. Codeforces is not only a competitive platform but also an educational tool, widely used by universities and individuals for training purposes. Its features and contests make it a central hub for those interested in improving their programming skills and participating in the competitive programming community.