Cod sursa(job #154333)

Utilizator andrei-alphaAndrei-Bogdan Antonescu andrei-alpha Data 11 martie 2008 09:36:41
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include <stdio.h>
#define N 2000012
char v[N]={0};
int sol[1024];
int main()
{
int n,pr=0,nr=0,i,j;
freopen("ciur.in", "r",stdin);
freopen("ciur.out", "w",stdout);
scanf("%d", &n);
	for(i=2;i<=n;++i)
		if(v[i]==0) 
			{ ++nr; for(j=i+i;j<=n;j+=i)
				 v[j]=1; } 

printf("%d\n",nr); 
return 0;
}