Cod sursa(job #526361)

Utilizator raul1520Raul Andrei raul1520 Data 28 ianuarie 2011 10:14:46
Problema Ciurul lui Eratosthenes Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <stdio.h>
using namespace std;
#define nmax 20000005
int n,x[nmax],i,j,d,k;
int main()
{
	freopen("ciur.in","r",stdin);
	freopen("ciur.out","w",stdout);
	scanf("%d",&n);
	x[0]=1;
	x[1]=1;
	d=0;
	for(i=2;i<n;i++)
	{
		if(x[i]==0)
		{
			for(j=2;j<n/i;j++)
			{
				x[i*j]=1;
			}
			d=d+1;
		}
	}
	printf("%d",d);
	return 0;
}