hashmap (1) 썸네일형 리스트형 [c++] 2309. Greatest English Letter in Upper and Lower Case 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 'E' .. 이전 1 다음