Cod sursa(job #749166)

Utilizator bia.liliPoenar Liana bia.lili Data 15 mai 2012 23:00:21
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
# include <fstream>
using namespace std;
int main()
{
    int i,j,n,nr=0;
    char ciur[2000001];
    ifstream f("ciur.in");
    ofstream g("ciur.out");
    f>>n;
    for(i=2;i<=n;i++)
    {if(ciur[i]==0) 
    {nr++;
    for(j=i+i;j<=n;j+=i)
    ciur[j]=1;}}
    
g<<nr;
f.close();
g.close();
return 0;}