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 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 = “l**Ee**TcOd**E**”

Output: “E”

Explanation:

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

Example 2:

Input: s = “a**rR**AzFif”

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 and Description
Solution()

Method Summary

Modifier and Type	Method and Description
String	greatestLetter(String s)

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution()

Method Detail

greatestLetter

public String greatestLetter(String s)