LPS  Longest Palindromic Substring
A palindrome is a string that is the same as its reverse. Example "malayalam", "dad", "appa" etc. In this problem you are asked to find the length of the longest contiguous substring of a given string, which is a palindrome.
Input
The first line consists of a single integer N, the no. of characters in the string. 1 <= N <= 100000.
Second line is a string with N characters, where the characters are always lowercase english alphabets, ie 'a' to 'z'.
Output
A single line with an integer representing the length of longest palindromic substring.
Example
Input:
5
ababa
Output:
5
hide comments
sifat_15:
20180919 09:22:09
Hlw, @akash1518


akash1518:
20180828 17:12:12
binary search +hashing (nlogn)


neha__mishra:
20180802 09:46:17
I tried many versions for this problem including dynamic programming but each of them gave wrong answer after test case 16 or 14 or 15 ........ I wonder if the test cases can be downloaded from somewhere or how to know about the critical test cases? 

Shubhashsi Roy Dipta:
20180412 13:58:47
Test case is weak


ammen99:
20180101 09:27:17
authors, please update the constraints in the problem statement, N can be as big as 5*10^5 

Krishna Mohan:
20171118 11:52:11
It seems like upper limit of n is not 10^5, but more than that 

gustavonunes:
20170724 23:34:03
getline gave me WA, cin Acc 

revenant:
20161203 12:13:49
Don't go for spoj toolkit ...it has some wrong code....... 

alpha coder:
20161006 19:03:30
something is wrong with input , n ! = length of the string . 

Jamil Siam:
20160911 13:57:06
Beware people! this problem has string length of around 150000 after test case 15!! 
Added by:  Srivatsan B 
Date:  20090604 
Time limit:  0.100s0.490s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ERL JSRHINO NODEJS PERL6 VB.NET 
Resource:  http://opc.iarcs.org.in/problems/iarcsfeb05ad1 