Cod sursa(job #1471787)

Utilizator ionut98Bejenariu Ionut Daniel ionut98 Data 15 august 2015 10:29:49
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
bool a[2000001];
int n,i,j,con;
int main()
{
    f>>n;
    for(i=2;i<=n;i++)
    {
        if(a[i]==0)
        {
            con++;
            for(j=i+i;j<=n;j+=i)
              a[j]=1;
        }
    }
    g<<con;
    return 0;
}