I don't know why this solution is correct, but it got accepted.
I thought that this solution will get TL.
Author of problem: easy tests?

Who couldn't find solution try to understand this code:

#include<map>
#include<cmath>
#include<ctime>
#include<vector>
#include<cstdio>
#include<string>
#include<cstring>
#include<cstdlib>
#include<iostream>
#include<string.h>
//#include<windows.h>
#include<algorithm>
#define y1 abcde
#define sqr(x) ((x)*(x))
#define INF 20000000000000000
using namespace std;

   string s;
   int i,n,ans,j,l,r;

   bool check(int l,int r)
{
        for(int i = 0; i < (r - l + 1) / 2; i++)
        if (s[l+i] != s[r-i]) return false;
    return true;
}
int main()
{
   //srand(GetTickCount());
   #ifndef ONLINE_JUDGE
    freopen("a.in","r",stdin);
    freopen("a.out","w",stdout);
   #endif

    cin>>s;
    n = s.size(); i++; s = '#' + s;
    for(i = 1; i <= n; i++)
     for(j = i; j <= n; j++)
    {
             if (check(i,j))
              if (j - i + 1 > ans)
                   ans = j-i+1,
                   l = i,
                   r = j;
    }
     for(i = l; i <= r; i++) cout<<s[i];
    return 0;
}

Edited by author 13.02.2013 14:44

Edited by author 13.02.2013 14:45