Cod sursa(job #277631)

Utilizator tudgal1001Profir Tudor tudgal1001 Data 11 martie 2009 20:16:22
Problema Ciurul lui Eratosthenes Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 0.26 kb
Raporteaza aceasta sursa 
#include<fstream.h>
#include<math.h>

ifstream f("ciur.in");
ofstream g("ciur.out");

int main ()
{
	long n,i,ok,j,k=0;
	f>>n;
	for (i=2; i<=n; i++)
	{
		ok=1;
		for (j=2; j<=i/2; j++)
			if (i%j==0) ok=0;
		if (ok==1) k++;
	}
	g<<k;
	return 0;
}