Cod sursa(job #1113163)

Utilizator StarGold2Emanuel Nrx StarGold2 Data 20 februarie 2014 13:23:17
Problema Ciurul lui Eratosthenes Scor 30
Compilator cpp Status done
Runda Arhiva educationala Marime 0.3 kb
#include<fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int v[200001],n,k,j,i;
int main(){
    fin>>n;
    for(i=2;i<=n;i++){
        if(v[i]==0){
            k++;
            for(j=i+i;j<=n;j=j+i)
                v[j]=1;
        }
    }
    fout<<k;
}