Compilare: main.cpp: In function 'int main()': main.cpp:13:29: warning: unused variable 'cnt' [-Wunused-variable] long long int n,cer,k,a,cnt=0,dv,sum=0; ^~~ main.cpp:13:35: warning: unused variable 'dv' [-Wunused-variable] long long int n,cer,k,a,cnt=0,dv,sum=0; ^~ main.cpp:25:15: warning: iteration 999998 invokes undefined behavior [-Waggressive-loop-optimizations] if(v[i]==0) ~~~^ main.cpp:23:19: note: within this loop for(int i=2; i<1000001; i++) ~^~~~~~~~