Compilare: user.c: In function ‘main’: user.c:15:11: warning: unused variable ‘i’ [-Wunused-variable] int n,i; ^ user.c:15:9: warning: unused variable ‘n’ [-Wunused-variable] int n,i; ^ user.c:9:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("random.in", "r", stdin); ^ user.c:10:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("random.out", "w", stdout); ^