Cod sursa(job #941456)

Utilizator ThomasFMI Suditu Thomas Thomas Data 18 aprilie 2013 20:52:25
Problema Ciurul lui Eratosthenes Scor 60
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;

ifstream f("ciur.in");
ofstream g("ciur.out");

unsigned long long n,i,j,nr;
short v[2000001];

int main()
{
    f>>n;
    for(i=2;i<=n;i++) if(v[i]==0)
    {
        ++nr;
        for(j=i;j<=n;j+=i) v[j]=1;
    }

    g<<nr<<"\n";

    f.close();
    g.close();
    return 0;
}