Compilare: user.cpp: In function ‘int main()’: user.cpp:64:16: warning: unused variable ‘c’ [-Wunused-variable] ll a,b,c,diva; ^ user.cpp:82:16: warning: unused variable ‘c’ [-Wunused-variable] ll a,b,c,diva; ^ user.cpp:54:10: warning: unused variable ‘j’ [-Wunused-variable] ll i,j,n; ^ user.cpp:51:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.in","r",stdin); ^ user.cpp:52:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("armonica.out","w",stdout); ^ user.cpp:56:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&n); ^