Restore the Permutation

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Alex, Kostya, Andrew and Sergey have recently attended the famous Russian competitive programming camp. One day, during the excursion they've became bored. Especially Sergey. So he asked Alex for some nice problem they can think about to dispel the boredom. And Alex told the following problem: There is an 1-indexed permutation A of the first N positive integers, which is not known. You can ask

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solution.cppC++17

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