Repeated String Pattern

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Given a string **s**, check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. ### Input The first and only line will contain a single string **s** denoting the string that has to be checked. ### Output Output "valid" if the string can be constructed by considering smaller substrings, "invalid" otherwise. ### Constraints - 1 <= s.lengt

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solution.cppC++17

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