Doubles

http://poj.org/problem?id=1552

 #include<stdio.h>
 const int N=;
 int main()
 {
     int n,f[N],g[N];
     int cnt;
     while()
     {
         cnt = ;
         scanf("%d",&n);
         if (n==-)
             break;
         f[] = n;
         g[] = *n;
         int i ;
         for ( i = ;; i ++)
         {
             scanf("%d",&f[i]);
             if (f[i]==)
                 break;
             g[i] = *f[i];
         }
         for (int j = ; j < i; j ++)
         {
             for (int k = ; k < i; k ++)
             {
                 if (f[j]==g[k])
                     cnt++;
             }
         }
         printf("%d\n",cnt);
     }
     return ;
 }