2309. Greatest English Letter in Upper and Lower Case

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Given a string of English letters s, return the greatest English letter which occurs as both a lowercase and uppercase letter in s. The returned letter should be in uppercase. If no such letter exists, return an empty string. An English letter b is greater than another letter a if b appears after a in the English alphabet. Example 1: Input: s = "lEeTcOdE" Output: "E" Explanation: The letter '

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solution.cppC++17

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