Compilare: user.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<fstream> ^~~~~~ user.cpp: In function ‘int main()’: user.cpp:2:120: warning: suggest parentheses around operand of ‘!’ or change ‘&’ to ‘&&’ or ‘!’ to ‘~’ [-Wparentheses] std::ifstream f("ciur.in");std::ofstream g("ciur.out");int n,i=3,j,r=1;bool P[2000005];int main(){for(f>>n;i<=n;i++)if(!P[i]&(i&1))for(j=i,++r;j<=n;P[j]=1,j+=i);g<<r;} ^~~~~