Longest Palindromic Substring

Try to solve the Longest Palindromic Substring problem.

Statement

Given a string s, return the longest palindromic substring in s.

Note: If there are multiple valid palindromic substrings of the same length, return any of them.

Constraints

  • 1≤1 \leq s.length ≤1000\leq 1000

  • s consist of only digits and English letters.

Examples

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