Compilare: user.cpp: In function ‘int main()’: user.cpp:12:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok = 1; ^~ user.cpp:13:19: warning: unused variable ‘fp’ [-Wunused-variable] long long int fp = 100, p; ^~ user.cpp:9:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pastila.in", "r", stdin); ^ user.cpp:10:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pastila.out", "w", stdout); ^ user.cpp:11:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &x); ^ user.cpp:17:11: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] p *= 3; ~~^~~~