Cod sursa(job #463493)

Utilizator SpiderManSimoiu Robert SpiderMan Data 16 iunie 2010 09:21:52
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <fstream>
#include <bitset>
using namespace std;
long j,a,i,n;
bitset <2000001> v;
int main()
{

   ifstream f("ciur.in");
   ofstream g("ciur.out");
   f>>n;
   for (i=3;i<=n;i+=2)
    if (!v[i])
    {
     a++;
     for (j=i+i;j<=n;j+=i)
      v[j]=1;
    }
   g<<a+1;
   f.close();
   g.close();
   return 0;

}