onlinejudge

Online Judge is a platform designed for programmers to practice and improve their coding skills. It was founded in 2005 by a group of Chinese computer science students. The platform allows users to solve various programming problems and challenges, primarily in the form of coding contests and hackathons.

The Online Judge platform features a vast library of problems, categorized by difficulty level, topic, and programming language. Users can select and attempt to solve problems, with the system providing real-time feedback on their submissions. The platform supports a wide range of programming languages, including Python, Java, C++, and others.

Online Judge also provides a social aspect, allowing users to compete with each other in coding contests and share their progress on a leaderboard. The platform encourages users to participate and engage in constructive discussions about problem-solving strategies and programming techniques.

The platform has gained popularity worldwide, particularly among students and professionals in the computer science community. Online Judge has also collaborated with various educational institutions and organizations to promote coding education and skills development.

The service is free to use, with the primary cost being users' time and effort in solving the problems. Online Judge operates on a crowdsourcing model, with the problems and challenges being created and submitted by a community of users. The platform's objective is to provide a platform for programmers to enhance their skills and foster a community of like-minded individuals.