Cod sursa(job #154039)

Utilizator SofinetiSofineti Mihai Sofineti Data 10 martie 2008 21:30:35
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.28 kb
Raporteaza aceasta sursa 
#include<stdio.h>
long n,k,i,j;
int a[2000001];
int main(){

freopen("ciur.in","r",stdin);
freopen("ciur.out","w",stdout);

scanf("%ld",&n);

for(i=2;i<=n;i++)
    if(a[i]==0)
    {
    for(j=2*i;j<=n;j=j+i)a[j]=1;
    k++;
    }

printf("%ld",k);
return 0;
}