Cod sursa(job #960075)

Utilizator xSliveSergiu xSlive Data 9 iunie 2013 18:42:23
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
int main()
{
    int n,a[2000001],i,j,c=0;
    ifstream f("ciur.in");
    ofstream g("ciur.out");
    f>>n;
    for(i=1;i<=n;i++)
        a[i]=1;
    for(i=2;i<=n;i++)
    {
        if(a[i])
            c++;
        for(j=2*i;j<=n;j=j+i)
            a[j]=0;
    }
    g<<c;
    return 0;
}