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Longest Palindromic Substring
Medium Accuracy: 47.93% Submissions: 790 Points: 4

Given a string S, find the longest palindromic substring in S. Substring of string S: S[ i . . . . j ] where 0 ≤ i ≤ j < len(S). Palindrome string: A string which reads the same backwards. More formally, S is palindrome if reverse(S) = S. Incase of conflict, return the substring which occurs first ( with the least starting index ).


Example 1:

Input:
S = "aaaabbaa"
Output:
aabbaa
Explanation:
The longest palindrome string present in
the given string is "aabbaa".


Your Task:  
You don't need to read input or print anything. Your task is to complete the function longestPalindrome() which takes string S as input parameters and returns longest pallindrome present in string.


Expected Time Complexity: O(|S|2)
Expected Auxiliary Space: O(1)


Constraints:
1 ≤ |S| ≤ 104

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Longest Palindromic Substring

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