Longest Palindromic Substring

Medium

Problem

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

A palindrome is a string that reads the same forward and backward.

Input: s = "babad"

Output: "bab"

"aba" is also a valid answer — both have length 3.

Input: s = "cbbd"

Output: "bb"

The longest palindromic substring is "bb" with length 2.

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