Cod sursa(job #280408)

Utilizator wallyMocanu Valentin wally Data 13 martie 2009 12:57:22
Problema Ciurul lui Eratosthenes Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 0.27 kb
Raporteaza aceasta sursa 
#include<fstream.h>
#define dim 2000001
char v[dim];
int main ()
{
long n,j,k=0,i;

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