Solution: Next Palindrome Using Same Digits
Discover how to use the two-pointer method to find the next palindrome larger than a given numeric palindrome by rearranging digits. Learn to split the number, identify the next lexicographical permutation of the left half, and mirror it to form the result efficiently.
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Statement
Given a numeric string, num_str, representing a 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 =
"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:
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