Cod sursa(job #622125)

Utilizator masterchiefSabin Olaru masterchief Data 17 octombrie 2011 14:23:36
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include <stdio>
int n,i,j,nr=0;
bool a[2000000];
int main(){
freopen("ciur.in","r",stdin);
freopen("ciur.out","w",stdout);
scanf("%d",&n);
for(i=2;i*i<= n;++i)
	if(!a[i])
for (j=i*i;j<=n;j+=i)
    a[j]=true;
for (i=2;i<=n;++i)
    if(!a[i])
       nr++;
printf("%d",nr);
return 0;
}