Compilare: user.cpp: In function ‘int main()’: user.cpp:25:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:28:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d",&x); ^ user.cpp: In function ‘void genciur()’: user.cpp:11:18: warning: iteration 200039u invokes undefined behavior [-Waggressive-loop-optimizations] if(ciur[i]==i) ^ user.cpp:9:5: note: containing loop for(i=2; i<=1000000;++i) ^ user.cpp:8:18: warning: iteration 200039u invokes undefined behavior [-Waggressive-loop-optimizations] ciur[i]=i; ^ user.cpp:7:5: note: containing loop for(i=2; i<=1000000; ++i) ^