Cod sursa(job #1236580)

Utilizator chescavicentiuChesca Vicentiu chescavicentiu Data 2 octombrie 2014 09:31:32
Problema Ciurul lui Eratosthenes Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.32 kb
Raporteaza aceasta sursa 
#include <iostream>

using namespace std;
long long i,j,n,nr;
bool OK[2000000];
int main()
{
    nr=0;
    cin>>n;
    for(i=2;i<=n;i++){
    OK[i]=true;
    }
    for(i=2;i<=n;i++)
    for(j=2*i;j<=n;j++)
    if(j%i==0)OK[j]=false;

    for(i=1;i<=n;i++)
    if(OK[i]==true)nr++;
    cout<<nr;
    return 0;
}