Longest Palindromic Substring Length
Updated Feb 24, 2026
Problem
Return the length of the longest palindromic substring.
Constraints
1 <= s.length <= 1000
Examples
Example 1
Input:
{"s": "babad"}
Output:
3
Function Signature
def longestPalindromeLength(self, s: str) -> int
How to Submit
Implement a Solution class with a longestPalindromeLength method.
Your method will be called with the input parameters and should return the answer.