UVa Online Judge
UVa Online Judge is an online automated judge for programming problems hosted by University of Valladolid. Its problem archive has over 4300 problems and user registration is open to everyone. There are currently over 100000 registered users. A user may submit a solution in ANSI C (C89), C++ (C++98), Pascal, Java, C++11 or Python. Originally it began without the last three options, but the Java option was added in 2001, the C++11 option was added in 2014, then the Python option was added in 2016 
UVa OJ also hosts contests. In the contest environment the user has a limited time to solve a small set of problems.
The UVa OJ was created in 1995 by Miguel Ángel Revilla, a mathematician teaching algorithms at the University of Valladolid in Spain. Ciriaco García de Celis, a student of Informatics of University of Valladolid wrote the whole code for the first version of the judge. The judge became open to the public only in April 1997. In November 1999 and 2000 UVa hosted the ACM ICPC SWERC programming contest. In 2007 a new system, developed by Miguel Revilla Rodríguez, and server replaced the old system.
- Official UVa website
- Official Forum
- UVa Toolkit Third-party website in which the user can test input in accepted solutions
- Hunting UVA Problems Third-party website that give some user statistics
- uDebug On uDebug, you can select a problem you’ve coded up a solution for, provide valid test input, and get the accepted output. You can then compare if the output produced by your program and the one on uDebug match up. If not, you can determine the test cases your program fails on and try to fix it.
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