Cod sursa(job #2164755)

Utilizator SofeiAndreiSofei Andrei SofeiAndrei Data 13 martie 2018 09:39:25
Problema Ciurul lui Eratosthenes Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.35 kb
Raporteaza aceasta sursa 
#include <iostream>
#include <fstream>
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
int i,n,K,k;
bool ok[2000001];
int main ()
{
    f>>n;
    for(i=2;i<=n;i++){
        if(ok[i]==0){
            K++;
            for(k=2*i;k<=n;k=k+i){
                ok[k]=1;
            }
        }
    }
    g<<K;
    return 0;
}