Compilare: user.cpp: In function ‘int main()’: user.cpp:15:8: warning: unused variable ‘f’ [-Wunused-variable] {FILE *f=freopen("recurenta2.in","r",stdin),*g=freopen("recurenta2.out","w",stdout); ^ user.cpp:15:46: warning: unused variable ‘g’ [-Wunused-variable] {FILE *f=freopen("recurenta2.in","r",stdin),*g=freopen("recurenta2.out","w",stdout); ^ user.cpp:17:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld%lld%lld%d",&a,&b,&c,&x1,&x2,&n); ^