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Codeforces is a website for hosting competitive programming contests, maintained by a group of competitive programmers from ITMO University. It helps individuals improve their algorithm and coding skills by teaching them how to write efficient code. Codeforces has over 600,000 registered users and is claimed to surpass Topcoder in terms of active contestants since 2013. The website has a fast rating system, and the problems on the site vary in difficulty. As a beginner, one can start with easy problems on the Problemset and work their way up. Codeforces also provides job opportunities for backend software engineers.
