Chef and Digits

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Yesterday Chef had a great party and doesn't remember the way he celebreated it. But he found a strange paper in his kitchen containing n digits (lets give them indices from 1 to n and name them a1, a2 ... aN). Chef remembers that he played such game: - On each step he choose an index x from 1 to n. - For all indices y (y he calculated the difference by = ax - ay. - Then he calculated B1 - sum

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solution.cppC++17

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