Compilare: user.cpp: In function ‘int main()’: user.cpp:89:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&n); ^ user.cpp:94:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&x); ^ user.cpp: In function ‘void ciur()’: user.cpp:15:15: warning: iteration 1000007u invokes undefined behavior [-Waggressive-loop-optimizations] if(v[i]==0) ^ user.cpp:13:14: note: containing loop for(i=2;i<=1000009;++i) ^