Strange Function

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As New Year is approaching, Salik is studying functions in order to sharpen his math skills. Instead of regular functions, he is studying a strange function F which operates on non-negative integers. The value of F(A) is obtained by the following process: - Compute the sum of digits of A; let's denote this sum by S. - If S is a single-digit integer, then F(A) = S. - Otherwise, F(A) = F(S). It'

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solution.cppC++17

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