Social Crash

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Praveen is a software engineer at facebook. Recently, due to some internal problems, facebook started malfunctioning. So, the CTO is assigning different tasks to the engineers. Praveen is responsible for fixing the code that calculates the number of mutual friends between two person in facebook. But Praveen is too tired, so you have to help him. Formally, there are N people registered on facebook

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solution.cppC++17

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