Cod sursa(job #1457582)

Utilizator AsttridMocanu Ada Astrid Asttrid Data 3 iulie 2015 17:52:08
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include<iostream>
#include<fstream>
using namespace std;
int prim[2000000],i,n,j,nr;
int main(){
ifstream f("ciur.in");
ofstream g("ciur.out");
f>>n;
for(i=2;i<=n;i++)
    prim[i]=1;
for(i=2;i<=n;i++)
{if(prim[i]==1)nr++;
for(j=2*i;j<=n;j+=i)
    prim[j]=0;
}

g<<nr<<"\n";

f.close();
g.close();
return 0;}