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Grokking the Coding Interview Patterns in Go

Solution: Next Palindrome Using Same Digits

Explore how to find the smallest palindrome larger than a given numeric palindrome by rearranging its digits. Learn to use the two pointers approach for efficient traversal, apply the next lexicographical permutation on half the number, and properly reconstruct the palindrome for optimal problem-solving skills.

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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:

  • ...