Here you will find solutions of many problems on spoj. If you want solution of some problem which is not listed in blog or have doubt regarding any spoj problem (which i have solved) or any programming concept (data structure) you can mail me @
And my humble request to you all that don't copy the code only try to understand the logic and algorithm behind the code. I have started this because if you tried as hard as you can and still can't find any solution to the problem then you can refer to this.
You can read my answer how to start competitive programming CLICK HERE

Thursday, March 13, 2014

GOPI_SW-Gopi and Sandwich

Gopi and Sandwich

below given code is for gopi_sw spoj or gopi and sandwich spoj.
use brute-force to find relation .
#include <stdio.h>
#include <iostream>
#include <map>
#include <cmath>
#include <cstdlib>
using namespace std;
#define MOD 1000000007
long long a[1000009];
void pre()
 int i;
  a[i]=a[i-1] *(a[i-1]+1) % MOD;
int main()
 int t;
  int n;
 return 0;