Compilare: user.cpp: In function ‘int main()’: user.cpp:12:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=1;j<=n;j++) ^ user.cpp:9:26: warning: unused variable ‘nn’ [-Wunused-variable] unsigned long long i,nn,nr=0,mm,c=0,k,x,j; ^ user.cpp:9:29: warning: unused variable ‘nr’ [-Wunused-variable] unsigned long long i,nn,nr=0,mm,c=0,k,x,j; ^ user.cpp:9:34: warning: unused variable ‘mm’ [-Wunused-variable] unsigned long long i,nn,nr=0,mm,c=0,k,x,j; ^ user.cpp:9:37: warning: unused variable ‘c’ [-Wunused-variable] unsigned long long i,nn,nr=0,mm,c=0,k,x,j; ^ user.cpp:9:41: warning: unused variable ‘k’ [-Wunused-variable] unsigned long long i,nn,nr=0,mm,c=0,k,x,j; ^ user.cpp:18:19: warning: iteration 90000000ull invokes undefined behavior [-Waggressive-loop-optimizations] while (a[i]>0) ^ user.cpp:17:5: note: containing loop for(i=0; i<900000000; i++) ^