Cod sursa(job #1904449)

Utilizator usureluflorianUsurelu Florian-Robert usureluflorian Data 5 martie 2017 15:55:43
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include <fstream>
#include <bitset>
using namespace std;
ifstream f ("ciur.in");
ofstream g ("ciur.out");
bitset <2000001> v;
int n,i,nr,j;
int main()
{
    f>>n;
    for(i=2;i<=n;++i)
    {
        if(!v[i])
        {
            ++nr;
            for(j=i+i;j<=n;j+=i) v[j]=1;
        }
    }
    g<<nr;
    return 0;
}