Compilare: user.cpp: In function ‘int main()’: user.cpp:12:12: warning: unused variable ‘e’ [-Wunused-variable] int k,q,w,e,i,d,pp,ppp,j; ^ user.cpp:12:21: warning: unused variable ‘ppp’ [-Wunused-variable] int k,q,w,e,i,d,pp,ppp,j; ^ user.cpp:12:25: warning: unused variable ‘j’ [-Wunused-variable] int k,q,w,e,i,d,pp,ppp,j; ^ user.cpp:13:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("prim.in","r",stdin); ^ user.cpp:14:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("prim.out","w",stdout); ^ user.cpp:15:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^