Cod sursa(job #662970)

Utilizator geniucosOncescu Costin geniucos Data 17 ianuarie 2012 16:30:08
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include<stdio.h>
using namespace std;
bool je[2000002];
int i,j,n,nr;
int main()
{
freopen("ciur.in","r",stdin);
freopen("ciur.out","w",stdout);
scanf("%d",&n);
for(i=2;i<=n;i++)
	if(je[i]==0)
	{
		for(j=i*i;j<=n;j=j+i)
			je[j]=1;
		nr++;
	}
printf("%d\n",nr);
return 0;
}