Cod sursa(job #1541648)

Utilizator adriancristacheCristache Adrian adriancristache Data 4 decembrie 2015 14:35:52
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <fstream>

using namespace std;
ifstream in("ciur.in");
ofstream out("ciur.out");

bool v[2000001];
int main()
{
    int n,gg=0,j=0,i;
    in>>n;
    for(i=2; i<=n; i++)
    {
        if(v[i]==0)
        {
            gg++;
            for(j=i*2; j<=n; j+=i)
                v[j]=1;
        }
    }
    out<<gg;
    return 0;
}