Building Permutation

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Permutation P is an ordered set of integers P1, P2, ..., PN, consisting of N distinct positive integers, each of them doesn't exceed N. We'll denote the ith element of permutation P as Pi. We'll call number N the size or the length of permutation P1, P2, ..., PN. You have a sequence of integers A1, A2, ..., AN. In one move, you are allowed to decrease or increase any number by one. Count the m

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solution.cppC++17

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