Chef and the Unique Number

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Chef was getting bored sitting idle, he asked his friend to give him some problem to solve. His friend gave him a simple question as she doesn't want him to waste much time. His friend will guess a random number n chef has to find a nearest unique pair to the left and right of n. A pair is called unique pair if both the numbers in a pair are prime and the absolute difference between them is 2. C

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solution.cppC++17

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