4.
import java.util.*;
import java.io.*;
public class Exercise
{
    public static void main(String [] args)
    {
        Scanner console= new Scanner(System.in);
        System.out.println("Input the E value you wish to use");
        int e = console.nextInt();
        LinkedList<Integer> list = new LinkedList<>()List<>();
        partition(list, e);
    }
    public static void partition(List<Integer>list, int value) {
        List<Integer> temp = new LinkedList<Integer>();
        Iterator<Integer> itr = list.iterator();
        while (itr.hasNext()) {
            int element = itr.next();
            if (element < value) {
                temp.add(0, element);
            } else {
                temp.add(element);
            }
        }

    }
}
6.
 public static int countUnique(LinkedList<Integer> list) {
        Set<Integer> set = new HashSet<Integer>();
        Iterator<Integer> itr = list.iterator();
        while (itr.hasNext()) {
            int temp = itr.next();

            if (!set.contains(temp)) {
                break;
            } else (set.add(temp));
            {
                set.add(temp);
            }
        }
        return set.size();
    }