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![Sphere Online Judge (SPOJ) Sphere Online Judge (SPOJ)](http://www.aidhw.com/zdmsl_include/images/timg.gif)
SPOJ(SphereOnlineJudge)isanonlinejudgesystemwithover315,000registeredusersandover20000problems.Thesolutiontoproblemscanbesubmittedinover60languagesincludingC,C++,Java,Python,C#,Go,Haskell,Ocaml,andF#.SPOJhasarapidlygrowingproblemset/tasksavailableforpractice24hours/day,includingmanyoriginaltaskspreparedbythecommunityofexpertproblemsettersassociatedwiththeproject.