Cod sursa(job #2262916)

Utilizator sidorencuoanaSidorencu Oana Alexandra sidorencuoana Data 17 octombrie 2018 22:14:41
Problema Ciurul lui Eratosthenes Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.33 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
#define MAX 2000000

using namespace std;

ifstream f ("ciur.in");
ofstream g ("ciur.out");

int v[MAX],N,i,j;

int main()
{f>>N;
v[0]=0;
    for(i=2;i<=N;i++)
      if(v[i]==0)
       {v[0]++;
       for(j=2;j*i<=N;j++)
              v[i*j]=1;
       }
    g<<v[0];

return 0;
}