Recursive Digit Sum

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We define super digit of an integer x using the following rules: Given an integer, we need to find the super digit of the integer. • If z has only 1 digit, then its super digit is z. • Otherwise, the super digit of x is equal to the super digit of the sum of the digits of z. For example, the super digit of 9875 will be calculated as: super_digit(9875) 9+8+7+5 = 29 super_digit(29) 2

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solution.cppC++17

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