Cod sursa(job #297812)

Utilizator TyberFMI Dogan Adrian Ioan Lucian Tyber Data 5 aprilie 2009 17:20:38
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.31 kb
Raporteaza aceasta sursa 
#include<stdio.h>
long long n,c,s[4000000];
int main(){
	freopen("ciur.in","r",stdin);
	freopen("ciur.out","w",stdout);
	long long i,j;
	scanf("%lld",&n);
	for(i=2;i<=n;i++)
		s[i]=1;
	for(i=2;i<=n;i++)
		if(s[i]!=0){
			c++;
			for(j=i+i;j<=n;j=j+i)
				s[j]=0;
		}
printf("%lld",c);
return 0;}