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Grokking the Coding Interview Patterns in Go

Solution: Next Palindrome Using Same Digits

Explore how to use the two pointer technique to find the next largest palindrome by rearranging digits of a numeric string. This lesson teaches splitting palindromes, applying lexicographical permutations, and efficiently forming the smallest larger palindrome, enhancing your problem-solving skills for coding interviews.

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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:

  • ...