Cod sursa(job #297829)

Utilizator TyberFMI Dogan Adrian Ioan Lucian Tyber Data 5 aprilie 2009 17:29:22
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.3 kb
Raporteaza aceasta sursa 
#include<stdio.h>
int n,c;
char s[4000000];
int main(){
	freopen("ciur.in","r",stdin);
	freopen("ciur.out","w",stdout);
	int i,j;
	scanf("%d",&n);
	for(i=2;i<=n;++i)
		s[i]=1;
	for(i=2;i<=n;++i)
		if(s[i]){
			++c;
			for(j=i+i;j<=n;j+=i)
				s[j]=0;
		}
printf("%d\n",c);
return 0;}