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

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

Example 1:
Input: "babad"
Output: bab
Constraints:

  • 1≤s.length≤10001 \leq s.\text{length} \leq 1000

  • s consists of only digits and English letters.

Input
arr ="babad"

Expand around each center

babadbTFFFFaFTFFFbFFTFFaFFFTFdFFFFT
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