IOIPALIN  Palindrome 2000
A palindrome is a symmetrical string, that is, a string read identically from left to right as well as from right to left. You are to write a program which, given a string, determines the minimal number of characters to be inserted into the string in order to obtain a palindrome. As an example, by inserting 2 characters, the string "Ab3bd" can be transformed into a palindrome ("dAb3bAd" or "Adb3bdA"). However, inserting fewer than 2 characters does not produce a palindrome.
Input
The first line contains one integer: the length of the input string N, 3≤N≤5000. The second line contains one string with length N. The string is formed from uppercase letters from ‘A’ to ‘Z’, lowercase letters from ‘a’ to ‘z’ and digits from ‘0’ to ‘9’. Uppercase and lowercase letters are to be considered distinct.
Output
The first line contains one integer, which is the desired minimal number.
Example
Input: 5 Ab3bd Output: 2
hide comments
da_201501181:
20170606 07:06:46
NEEDS Space Optimisation..!! 

cake_is_a_lie:
20170304 00:13:28
cin/cout; string; 0.170.19s AC


vengatesh15:
20170128 10:34:07
Too strict Time limit.. 

prasoonbatham:
20170126 14:06:15
Too strict time limit.


sas1905:
20161221 19:52:57
space O(N^2) gets accepted with fast I/P in C++..


sriraj:
20161028 23:51:20
Too strict time constraints :/ long long int : TLE, int : AC


amit_taps1997:
20161028 15:53:05
Top Down Memoization AC 

siddharth_0196:
20161005 11:00:39
String : TLE


Min_25:
20160805 02:10:30
Almost the same problem as AIBOHP. 

shayan718:
20160731 19:50:40
top 10 dp problems ;) 
Added by:  Gareev 
Date:  20100816 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: NODEJS OBJC PERL6 VB.NET 
Resource:  IOI 2000, Day 1 