Elegant Strings

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A string of lowercase alphabets is considered to be $k$-elegant if it satisfies all of the following conditions: - The characters on the odd indices are the same (say $c_o$). - The characters on the even indices are the same (say $c_e$). - $c_o$ and $c_e$ are not the same. - The difference between the character on odd and even indices is at most $k$. The difference between $2$ characters is define

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solution.cppC++17

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