Cod sursa(job #1011707)

Utilizator Matt22bossmateiboss Matt22boss Data 17 octombrie 2013 11:15:03
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
bool v[2000005];
int n,i,j,k;
 int main ()
{

    f>>n;
    for (i=2; i*i<=n;i++)
        if (v[i]==0)
            for (j=i*i;j<=n;j=j+i)
                v[j]=1;
    k=0;
    for (i=2;i<=n;i++)
        if (v[i]==0) k++;
    g<<k;
}