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Grokking the Coding Interview Patterns in C++

Next Palindrome Using Same Digits

Understand how to identify the smallest larger palindrome by rearranging digits of a given numeric palindrome. Explore the two pointers method to efficiently solve this, and practice applying logic to generate valid next palindromes.

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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 = ...