Compilare: user.cpp: In function ‘int main()’: user.cpp:17:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long i=1; i<=nr; i++) ^ user.cpp:10:24: warning: unused variable ‘n’ [-Wunused-variable] unsigned long long n,d1=0,d2=0,nr,val=1,st,dr; ^ user.cpp:10:31: warning: unused variable ‘d2’ [-Wunused-variable] unsigned long long n,d1=0,d2=0,nr,val=1,st,dr; ^ user.cpp:10:39: warning: unused variable ‘val’ [-Wunused-variable] unsigned long long n,d1=0,d2=0,nr,val=1,st,dr; ^