Package g2301_2400.s2309_greatest_english_letter_in_upper_and_lower_case

Class Solution

java.lang.Object
g2301_2400.s2309_greatest_english_letter_in_upper_and_lower_case.Solution
public class Solution extends java.lang.Object
2309 - Greatest English Letter in Upper and Lower Case.

Easy

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’ is the only letter to appear in both lower and upper case.

Example 2:

Input: s = “arRAzFif”

Output: “R”

Explanation:

The letter ‘R’ is the greatest letter to appear in both lower and upper case.

Note that ‘A’ and ‘F’ also appear in both lower and upper case, but ‘R’ is greater than ‘F’ or ‘A’.

Example 3:

Input: s = “AbCdEfGhIjK”

Output: ""

Explanation: There is no letter that appears in both lower and upper case.

Constraints:

  • 1 <= s.length <= 1000
  • s consists of lowercase and uppercase English letters.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.lang.String
    greatestLetter(java.lang.String s)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • greatestLetter

      public java.lang.String greatestLetter(java.lang.String s)