Compilare: user.cpp: In function ‘int main()’: user.cpp:9:17: warning: unused variable ‘i’ [-Wunused-variable] long long n,i,nr1=1; ^ user.cpp:10:9: warning: unused variable ‘j’ [-Wunused-variable] int j,pp,sum,p,p2=2,afi,nr2; ^ user.cpp:10:14: warning: unused variable ‘sum’ [-Wunused-variable] int j,pp,sum,p,p2=2,afi,nr2; ^~~ user.cpp:10:18: warning: unused variable ‘p’ [-Wunused-variable] int j,pp,sum,p,p2=2,afi,nr2; ^ user.cpp:7:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fetite.in","r",stdin); ^ user.cpp:8:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fetite.out","w",stdout); ^