Leetcode 2309. Greatest English Letter in Upper and Lower Case

Find the alphabetically largest English letter that appears in the input string in both lowercase and uppercase forms, returning it as an uppercase character (or an empty string if none exists). This is typically solved by tracking case occurrences (e.g., using sets) and checking letters from 'Z' to 'A'.

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Leetcode 2309. Greatest English Letter in Upper and Lower Case

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