Cod sursa(job #1000096)

Utilizator toncuvasileToncu Vasile toncuvasile Data 21 septembrie 2013 23:20:15
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
#include<fstream>
using namespace std;

int a[2000005],n,k;

int main(){
   ifstream inFile("ciur.in");
   inFile>>n;
   int i,j;
   for(i=2;i<=n/2;i++)
      for(j=i+i;j<=n;j=j+i) a[j]=1;
   if(n<2) k=0;
     else k=1;
   for(i=3;i<=n;i++) if(a[i]==0) k++;

   ofstream outFile;
   outFile.open("ciur.out");
   outFile<<k;


}