Cod sursa(job #1816967)

Utilizator GiuliaBGBulugean Giulia Maria GiuliaBG Data 27 noiembrie 2016 10:57:47
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.31 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int n,i,nr,v[2000001],j;

int main()
{ fin>>n;
nr=0;
for(i=2;i<=n;i++)
   if(v[i]==0){
      nr++;
     for(j=i+i;j<=n;j=j+i)
         v[j]=1;
   }
    fout << nr;
    return 0;
}