Cod sursa(job #2003671)

Utilizator viman39Victor viman39 Data 23 iulie 2017 16:17:53
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 f("ciur.in");
ofstream g("ciur.out");

int main()
{
    int n, i, k=0;
    char e[2000000];
    f>>n;

    for(i=2;i<=n;i++)
        e[i]=1;

    for(i=2;i<=n;i++)
        if(e[i]){
            for(int j=i+i;j<=n;j+=i) e[j]=0;
            k++;
        }
    g<<k;
}