Cod sursa(job #1469772)

Utilizator marius7Vlad Marius marius7 Data 9 august 2015 15:39:37
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream  fout("ciur.out");
int p[1000001];


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

      }
   }
    fout<<nr;
    return 0;

}