System design interview questions for IT companies

Even a software engineer with many years of working experience at a top IT company may not be an expert on system design. If you want to become an expert, you need to read many books, articles, and solve real large scale system design problems. Design a function to return the top k requests during past time interval

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Use case is a description of sequences of events that, taken together, lead to a system doing something useful.

Source: github.com