Cod sursa(job #1312236)

Utilizator Alex1199Alex Bercea Alex1199 Data 9 ianuarie 2015 00:00:20
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
bool a[2000001];
int64_t i, j, n, m;
int main()
{
   f>>n;
     for(i=2;i<=n;i++)
        for(j=2;j*i<=n;j++)
          if (i*j<2000000)
          a[i*j]=true;
   for(i=1;i<=n;i++)
        if(!a[i]) m++;
        g<<m;
    return 0;
}