Cod sursa(job #1551905)

Utilizator enouGhAbu Ras Mohamed Ata Radu enouGh Data 16 decembrie 2015 21:06:59
Problema Ciurul lui Eratosthenes Scor 70
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include<fstream>
#include<bitset>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");

int nr,n,i,j;
bitset<2000001>v;

int main()
{   fin>>n;
    nr=0;
    for(i=2;i<=n;i++)
    {
        if (v[i]==0)
            nr++;
        for(j=i*2;j<=n;j=j+i)
            v[j]=1;
    }
    fout<<nr;
}