Compilare: user.c: In function ‘main’: user.c:9:5: warning: format ‘%d’ expects argument of type ‘int *’, but argument 2 has type ‘long int *’ [-Wformat=] scanf("%d %d",&n,&k); ^ user.c:9:5: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘long int *’ [-Wformat=] user.c:6:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("facebook.in","r",stdin); ^ user.c:7:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("facebook.out","w",stdout); ^ user.c:9:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k); ^ user.c:11:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%li",&a[i]); ^