Compilare: user.cpp: In function ‘int main()’: user.cpp:10:17: warning: unused variable ‘nr’ [-Wunused-variable] long long n,nr,p2; ^~ user.cpp:11:13: warning: unused variable ‘i’ [-Wunused-variable] int p,o,i,j,pp,x; ^ user.cpp:11:15: warning: unused variable ‘j’ [-Wunused-variable] int p,o,i,j,pp,x; ^ user.cpp:11:17: warning: variable ‘pp’ set but not used [-Wunused-but-set-variable] int p,o,i,j,pp,x; ^~ user.cpp:11:20: warning: unused variable ‘x’ [-Wunused-variable] int p,o,i,j,pp,x; ^ user.cpp:8:35: 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:9:37: 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); ^