Cod sursa(job #2253807)

Utilizator andreisamoila74Samoila Andrei andreisamoila74 Data 4 octombrie 2018 14:22:36
Problema Ciurul lui Eratosthenes Scor 90
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;

ifstream f("ciur.in");
ofstream g("ciur.out");

bool x[2000000];
long long n, k;

int main()
{
    f >> n;
    for (long long i=2; i<=n;i++)
        if (x[i]==0)
    {
        k++;
        for (long long j = i*i; j<=n; j+=i)
            x[j]=1;
    }
    g << k;
}