Cod sursa(job #1109595)

Utilizator geo.calin32Calin George geo.calin32 Data 17 februarie 2014 13:26:02
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
#define NMAX 2000000
long a[NMAX];
using namespace std;

int main()
{long i,j,nr=0;
long n;
ifstream f ("ciur.in");
ofstream g ("ciur.out");
f>>n;
for (i=2;i<=n;i++) a[i]=1;
for (i=2;i<=n;i++)
if(a[i]==1)
{nr++;
    for(j=i+i;j<=n;j=j+i) a[j]=0;
}
g<<nr;
f.close();
g.close();
    return 0;
}