Cod sursa(job #1780505)

Utilizator NinjaCubeMihai Radovici NinjaCube Data 16 octombrie 2016 12:20:10
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.36 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
#include <bitset>
using namespace std;
bitset<2000005> v;
int main()
{
int nr,i,j,n;
ifstream fin ("ciur.in");
ofstream fout ("ciur.out");
fin>>n;
nr=0;
//*
for (i=2;i<=n;i++)
{
    if (v[i]==0)
    {
        ++nr;
        for(j=i*i;j<=n;j+=i)
            v[j]=1;
    }

}
//*/
fout<<nr;
return 0;
}