Sereja and Progressions

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Sereja likes arithmetic progressions a lot. An infinite arithmetic progression (a, r) is determined by its initial term and difference of consecutive terms, denoted by a, r respectively. He defines mutual attraction of some array A of size N with an infinite arithmetic progression (a, r), as |A1 - a| + |A2 - (a + r)| + .. + |Ai - (a + r * (i - 1)| + .. + |AN - (a + r * (N - 1)|, where |x| denote

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solution.cppC++17

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