Cod sursa(job #1819989)

Utilizator GeoeyMexicanuBadita George GeoeyMexicanu Data 1 decembrie 2016 00:44:18
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
bool v[2000001];
int n,i,j,nr=0;
int main()
{
    f>>n;
    for(i=2;i<=n;i++)
    {
        if(v[i]==0)
        {
            nr++;
            for(j=i+i;j<=n;j=j+i)
                v[j]=1;
        }
    }
    g<<nr;
}