Birthday party

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Lucky invites his friends on his birthday party. Only N friends, numbered from 1 to N came to his house. They all sit around a circular table around which N chairs are placed. They sit in a such a manner that ith friend will sit in between (i-1)th and (i+1)thth friend. Nth friend will sit adjacent to 1st friend. After dinner all the adjacent friends of Lucky became friends with each other except 1

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solution.cppC++17

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