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Longest Palindromic Substring
Given a string s, return the longest palindromic substring in s.
Given a string s, return the longest palindromic substring in s.
Example 1
Input: s = "babad"
Output: "bab"
Explanation: "aba" is also a valid answer.
Example 2
Input: s = "cbbd"
Output: "bb"
Constraints
- 1 <= s.length <= 1000
- s consist of only digits and English letters.
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