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3798. Largest Even Number

Description

You are given a string s consisting only of the characters '1' and '2'.

You may delete any number of characters from s without changing the order of the remaining characters.

Return the largest possible resultant string that represents an even integer. If there is no such string, return the empty string "".

 

Example 1:

Input: s = "1112"

Output: "1112"

Explanation:

The string already represents the largest possible even number, so no deletions are needed.

Example 2:

Input: s = "221"

Output: "22"

Explanation:

Deleting '1' results in the largest possible even number which is equal to 22.

Example 3:

Input: s = "1"

Output: ""

Explanation:

There is no way to get an even number.

 

Constraints:

• 1 <= s.length <= 100
• s consists only of the characters '1' and '2'.

Solutions

Solution 1

• Java
• C++
• Python
• Go
• TypeScript

• class Solution {
      public String largestEven(String s) {
          int i = s.length();
          while (i > 0 && s.charAt(i - 1) == '1') {
              i--;
          }
          return s.substring(0, i);
      }
  }
  
  

• class Solution {
  public:
      string largestEven(string s) {
          while (!s.empty() && s.back() == '1') {
              s.pop_back();
          }
          return s;
      }
  };
  
  

• class Solution:
      def largestEven(self, s: str) -> str:
          return s.rstrip("1")
  
  

• func largestEven(s string) string {
  	return strings.TrimRight(s, "1")
  }
  
  

• function largestEven(s: string): string {
      return s.replace(/1+$/, '');
  }
  
  

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