String manipulation

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Given a String, check whether all the lowercase letters are present exactly once. If present, then print $0$. If some letters are missing then print the missing letters in the form of a string in Lexicographic order. If all the letters are present and some of them are repeated more than once then print the sum of ASCII characters of the letters which occurred more than once. ###Input: - The fir

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solution.cppC++17

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