Package g2301_2400.s2384_largest_palindromic_number

Class Solution

java.lang.Object
g2301_2400.s2384_largest_palindromic_number.Solution
public class Solution extends java.lang.Object
2384 - Largest Palindromic Number.

Medium

You are given a string num consisting of digits only.

Return the largest palindromic integer (in the form of a string) that can be formed using digits taken from num. It should not contain leading zeroes.

Notes:

  • You do not need to use all the digits of num, but you must use at least one digit.
  • The digits can be reordered.

Example 1:

Input: num = “444947137”

Output: “7449447”

Explanation:

Use the digits “4449477” from “ 44494 7 13 7 ” to form the palindromic integer “7449447”.

It can be shown that “7449447” is the largest palindromic integer that can be formed.

Example 2:

Input: num = “00009”

Output: “9”

Explanation:

It can be shown that “9” is the largest palindromic integer that can be formed.

Note that the integer returned should not contain leading zeroes.

Constraints:

  • 1 <= num.length <= 105
  • num consists of digits.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    java.lang.String
    largestPalindromic(java.lang.String num)
     

    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

    • largestPalindromic

      public java.lang.String largestPalindromic(java.lang.String num)