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SPOJ(SphereOnlineJudge)isanonlinejudgesystemwithover315,000registeredusersandover20000problems.Thesolutiontoproblemscanbesubmittedinover60languagesincludingC,C++,Java,Python,C#,Go,Haskell,Ocaml,andF#.SPOJhasarapidlygrowingproblemset/tasksavailableforpractice24hours/day,includingmanyoriginaltaskspreparedbythecommunityofexpertproblemsettersassociatedwiththeproject.