Cod sursa(job #484935)

Utilizator zloteanu.adrianzloteanu adrian nichita zloteanu.adrian Data 16 septembrie 2010 15:43:44
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.25 kb
Raporteaza aceasta sursa 
#include<fstream.h>
int n,i,j,k=0;
char s[2000001];
int main()
{ifstream q("ciur.in");
ofstream w("ciur.out");
q>>n;
for(i=2;i<=n;i++)
  s[i]=1;
for(i=2;i<=n;i++)
  {if(s[i]==1)
    {k++;
    for(j=i+i;j<=n;j+=i)
      s[j]=0;}}
w<<k;
return 0;}