Cod sursa(job #1900633)

Utilizator dariaivascu05Ivascu Daria dariaivascu05 Data 3 martie 2017 15:27:55
Problema Ciurul lui Eratosthenes Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <fstream>

using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
long long n,i,j,v[1005],nr;
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;
      }
    nr=0;
    for(i=2;i<=n;i++)
       if(v[i]==0) nr++;
    g<<nr<<endl;
    return 0;
}