Cod sursa(job #1166058)

Utilizator andreimdvMoldovan Andrei andreimdv Data 3 aprilie 2014 10:36:26
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int n,i,j,nr;
bool v[2000001];
int main()
{
    fin>>n;
    for(i=2;i<=n;++i)
    if(v[i]==0)
    for(j=i*2;j<=n;j+=i)
    v[j]=1;

    for(i=2;i<=n;++i)
    if(v[i]==0)
    nr++;
    fout<<nr;


    return 0;
}