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Grokking the Coding Interview Patterns in Python

Next Palindrome Using Same Digits

Explore how to identify the next smallest palindrome greater than a numeric palindrome by rearranging its digits. Understand the use of two-pointer techniques to solve this problem efficiently, and practice implementing the solution in a coding environment.

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Statement

Given a numeric string, num_str, 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 num_str 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 = ...