Compilare: user.cpp: In function ‘int main()’: user.cpp:8:24: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] long long n,nr,nrr,a,c,dif,i,ma,mi; ^ user.cpp:8:28: warning: variable ‘dif’ set but not used [-Wunused-but-set-variable] long long n,nr,nrr,a,c,dif,i,ma,mi; ^