Cod sursa(job #837560)

Utilizator paulhelmerPaul Helmer paulhelmer Data 18 decembrie 2012 09:42:47
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include <fstream>
#include <math.h>

using namespace std;
int a[2000001];
int main()
{
	ifstream f("ciur.in");
	ofstream g("ciur.out");
    int n, i, j, k=0;
	f >> n;
    for (i=2; i<=sqrt(n); i++)
    if(a[i]==0)
    for(j=i; j<=n/i; j++)
    a[i*j]=1;
    for(i=1; i<=n; i++)
    if (a[i]==0) k++;
	g<<k;
}