Cod sursa(job #2223856)

Utilizator roberttrutaTruta Robert roberttruta Data 21 iulie 2018 20:28:32
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;
int n,i,j,nr;
bool v[2000002];
int main()
{
    ifstream f("ciur.in");
    ofstream g("ciur.out");

    f>>n;
    for(i=2;i*i<=n;i++)
        if(!v[i])
        for(j=i*i;j<=n;j=j+i)
        v[j]=1;

    for(i=2;i<=n;i++)
        if(!v[i])
        nr++;
    g<<nr;
    return 0;
}