Compilare: user.c:15:11: warning: return type of ‘main’ is not ‘int’ [-Wmain] long long main() ^ user.c: In function ‘main’: user.c:29:13: warning: unused variable ‘v4’ [-Wunused-variable] long long v4 = 0; ^ user.c:19:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("produs4.in", "r", stdin); ^ user.c:20:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("produs4.out", "w", stdout); ^ user.c:22:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &T); ^ user.c:33:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &N); ^ user.c:36:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &x); ^