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Grokking the Coding Interview Patterns in JavaScript

Solution: Next Palindrome Using Same Digits

Explore how to find the next smallest palindrome larger than a given palindrome by rearranging its digits. Learn to apply the two pointer technique to manipulate the left half of the number and generate the next lexicographical permutation. Understand how to handle both even and odd length palindromes efficiently.

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Statement

Given a numeric string, numStr, representing a palindromeA palindrome is a number that reads the same backward as it does forward. (composed only of digits). Return the smallest palindrome larger than numStr that can be created by rearranging its digits. If no such palindrome exists, return an empty string "".

Consider the following example to understand the expected output for a given numeric string:

  • input string = "123321"

  • The valid palindromes made from the exact digits are "213312", "231132", "312213", "132231", "321123".

  • We return the palindrome "132231" because it is the smallest palindrome larger than the input string "123321".

Constraints:

  • ...