Cod sursa(job #422348)

Utilizator bam67Blidar Adrian Marian bam67 Data 22 martie 2010 16:00:09
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.27 kb
Raporteaza aceasta sursa 
#include<fstream.h>
int a[2000009],i,k=1,j,n;
int main()
{ifstream f("ciur.in"); ofstream g("ciur.out");f>>n;
for(i=1;i<=n;i++)
a[i]=i;
for(i=4;i<=n;i=i+2)
 a[i]=0;
for(i=3;i<=n;i=i+2)
    if(a[i]!=0) {k++;for(j=2*i;j<=n;j=j+i)
			   a[j]=0;}
g<<k;
return 0;}