Cod sursa(job #1284469)

Utilizator ionutzelStroe Ionut ionutzel Data 6 decembrie 2014 15:49:02
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>

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