Cod sursa(job #1972992)

Utilizator darisavuSavu Daria darisavu Data 24 aprilie 2017 10:33:27
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.31 kb
Raporteaza aceasta sursa 
#include <fstream>

using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
int a[1000005],i,j,nr,n;
int main()
{
    f>>n;
    for(i=2;i<=n;i++)
    {
        if(a[i]==0)
        {
            for(j=i*i;j<=n;j=j+i) a[j]=1;
            nr++;
        }
    }
    g<<nr;
    return 0;
}