Cod sursa(job #332790)
Utilizator | A Cosmina - vechi miculprogramator | Data | 19 iulie 2009 20:30:38 |
---|---|---|---|
Problema | Ciurul lui Eratosthenes | Scor | 20 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.3 kb |
#include <fstream.h>
int main()
{
ifstream f("ciur.in");
ofstream g("ciur.out");
long long int n;
int i,nr=0,prim=1,j;
f>>n;
f.close();
for (i=2;i<=n;i++)
{
prim=1;
for (j=2;j<=i/2;j++)
if (i%j==0) prim=0;
if (prim) nr++;
}
g<<nr;
g.close();
return 0;
}