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Pros
Pro Large number of questions and challenges
CareerCup was founded in 2005 and it has been popular for a lot of time. During this time users have been posting a lot of questions and challenges and as a result have created one of the largest databases of interview questions.
Pro Real-world interview questions
CarerrCup is more of a discussion forum on which people post real-world interview questions from real tech companies. As such it's a powerful tool for preparing for interviews and real problems that people may find.