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CodeEval. ProjectEUREKA. Code Golf. CodeChef. USACO. +Ma's Reversing. Sphere Online Judge (SPOJ) CodingBat. InterviewStreet. We built HackerRank to focus on you, the programmer.


Here you will find a much larger set of challenges, including Artificial Intelligence and Machine Learning, in addition to classic ACM-style problems. We have also migrated the existing Interviewstreet challenges over to HackerRank. UVa Online Judge. Project Euler. CodeKata. Programming Praxis.