Cod sursa(job #847041)

Utilizator aurelian121bonte aurelian aurelian121 Data 3 ianuarie 2013 10:55:24
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;
int n,s;
char c[2000006];
int main()
{
    ifstream fin("ciur.in");
    ofstream fout("ciur.out");
    fin>>n;
    for(int i=2;i<=n;i++)
        if(c[i]==0)
    {
        s++;
        for(int j=2;i*j<=n;j++)
            c[j*i]=1;
    }
    fout<<s;
    return 0;
}