Search⌘ K
AI Features
Home
Courses
Grokking the Coding Interview Patterns in JavaScript

Solution: Next Palindrome Using Same Digits

Understand how to find the smallest palindrome larger than a given numeric palindrome by rearranging its digits using the two pointers technique. Learn to split the palindrome, identify next permutations for the left half, and efficiently reconstruct the next palindrome using string manipulation methods. This lesson helps you apply algorithmic strategies to solve palindrome-related coding problems with linear time complexity.

We'll cover the following...

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:

  • ...