Cod sursa(job #1112985)

Utilizator morosanucipiMorosanu Cipi morosanucipi Data 20 februarie 2014 10:59:18
Problema Ciurul lui Eratosthenes Scor 100
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");
int n,k=0,i,j;
bool a[2000000];
int main()
{
    f>>n;
    for(i=2;i<=n;i++)
        {if(a[i]==0)
           {
              k++;
              for(j=i+i;j<=n;j=j+i)
                a[j]=1;
           }
        }
         g<<k;
    return 0;
}