Cod sursa(job #2116470)

Utilizator RaimondMare Raimond Raimond Data 27 ianuarie 2018 17:47:03
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
int x[2000000],n,k=0;
int main()
{
    ifstream in("ciur.in");
    ofstream out("ciur.out");
    in>>n;
    for(int i=2;i<n;i++)
        if(x[i]==0)
        {
            k++;
            for(int j=i+i;j<n;j+=i)
            x[j]=1;
        }
        out<<k;
    return 0;
}