A short introduction about Hackerrank. It's a technological company which focuses on Competitive Programming. Providing services to Individual and Organization. Sections they covering Practice, Competition, Jobs.
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Practice - Different types of question from Algorithms to Query by using most of the popular programming languages.
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Competition - Where you can compete with members with hidden test cases for problems and provides some prices if you win the competition and some times chances for interview in high profile companies for job
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Jobs - Competition based job selection for the first round.