Cod sursa(job #1478681)

Utilizator RaduMirceaAndreiRadu Mircea Andrei RaduMirceaAndrei Data 29 august 2015 11:41:38
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.34 kb
Raporteaza aceasta sursa 
# include <fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int j,n,i,x;
bool v[2000001];
int main () {
    fin>>n;
    for(i=2;i<=n;i++){
        if(v[i]==0){
            x++;
            for(j=2*i;j<=n;j=j+i){
                v[j]=1;
            }
        }
    }
    fout<<x;
    return 0;
}