Cod sursa(job #1364777)

Utilizator danysilas23Silas Daniel danysilas23 Data 27 februarie 2015 20:13:00
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <fstream>
using namespace std;
bool ciur[20000000];

int main(){
    ifstream cin("ciur.in");
    ofstream cout("ciur.out");
    int i,j,n,cnt=0;
    cin>>n;
    for (i=2;i<n;i++){
        if(ciur[i]==0){
            cnt++;
        for(j=i+i;j<=1;j+=i)
                ciur[i]=1;
        }
    }
    cout<<cnt;
    return 0;
}