Compilare: user.c: In function ‘main’: user.c:16:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("euro2.in","r",stdin),freopen("euro2.out","w",stdout),scanf("%d",&n); ^ user.c:16:42: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("euro2.in","r",stdin),freopen("euro2.out","w",stdout),scanf("%d",&n); ^ user.c:16:72: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("euro2.in","r",stdin),freopen("euro2.out","w",stdout),scanf("%d",&n); ^ user.c:18:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d.%d",&x,&y),a[i]=x*10000+y; ^