Cod sursa(job #1977964)

Utilizator Mateioo7Chis Matei Mateioo7 Data 6 mai 2017 16:08:07
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;

int n,i,j,nr=1;
long a[2000000];

int main()
{
    ifstream f("ciur.in");
    ofstream g("ciur.out");
    f >> n;

    for (i=3;i<=n;i=i+2)
        if (a[i] == 0)
        {
            nr++;
            for (j=i+i;j<=n;j=j+i)
                a[j] = 1;
        }
    g << nr;
}