infoarena informatica de performanta

#include<stdio.h>
#include<iostream.h>
void main()
{
FILE*f=fopen("date.in","rt");
FILE*g=fopen("multimi.out","wt");
int i,n,x,a[100];
fscanf(f,"%d",&n);
for(i=1;i<=n;i++)
    fscanf(f,"%d",&a[i]);
for(i=1;i<=n;i++)
    {
    a[i]=i*2;
    fscanf(f, "%d", &x);
    if(x==a[i])
      {
      fprintf(g,"*");
      break;
      }
    }
if(i>n)fprintf(g,"!");
for(i=1;i<=n;i++)
fprintf(g,"%d", &a[i]);
}