An online judge is an online system to test programs in programming contests. They are also used to practice for such contests.
The system can compile and execute your code, and test your code with pre-constructed data. Submitted code may be run with restrictions, including time limit, memory limit, security restriction and so on. The output of the code will be captured by the system, and compared with the standard output. The system will then return the result.
When mistakes were found in a standard output, the submission will be unsuccessful. You must correct any errors in the code, and resubmit for re-judgement.
Some examples of online judges are:
- Valladolid Problem Archive with Online Judge, about 2000 problems, supports C, C++, Pascal and Java programming languages
- Ural State University Problem Archive with Online Judge, over 500 problems
- Saratov State University Problem Archive with Online Judge, over 200 problems
- URI Online Judge, more than 700 problems formulated in English and Portuguese; supports C, C++ and Java; problems divided into 8 major categories; build-in toolkit (generate output from input)
- Jollybee Online Judge, more than 100 problems in English and Bahasa Indonesia, weekly contests; supports C, C++, Pascal, Java, Python; Problem can be sorted by difficulty;
- Peking University Online Judge, over 2300 problems including more than 200 original problems
- Moscow Problem Archive with Online Judge, not many, but high quality problems
- Sphere Online Judge, about 3000 problems formulated in English, Polish, Vietnamese, Portuguese; supports over 30 different Programming languages.
- Lviv National University Online Judge, over 100 hard ACM-type problems. Only ukrainian language.
- Tianjin University Online Judge, over 2000 problems, virtual contests supported.
- Zhejiang University Online Judge, 1875 problems but only supports C, C++, and Pascal
- Harbin Institute of Technology Online Judge
- Fuzhou University Online Judge
Examples of modern judge platforms
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