Cod sursa(job #1339961)

Utilizator Vasile_RotaruVasea Rotaru Vasile_Rotaru Data 11 februarie 2015 13:19:12
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.29 kb
Raporteaza aceasta sursa 
#include<fstream>

using namespace std;
int n,n1[2000001],i,j,k;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int main()
{
    fin>>n;
    for(i=2;i<=n;++i)for(j=i;j<=n/i;++j)if(n1[i]==0){n1[i*j]=1;}j=0;
    for(i=2;i<=n;++i)if(n1[i]==0)++j;
    fout<<j;
    return 0;
}