list

import java.util.Random;

public class List {
    private static class Node {
        private Node(int v, Node n) {
            val = v;
            next = n;
        }
        private int val;
        private Node next;
    }
    private Node head;

    public List(int rangeOfRandomNumbers, int amountOfRandomNumbers) {
        head = null;
        for (int i = 0; i < amountOfRandomNumbers; i++) {
            addRandom(rangeOfRandomNumbers);
        }
    }
    public List(boolean) {
        head = null;
    }
    public void add(int i) {
        head = new Node(i, head);
    }
    public void addRandom(int r) {
        Random obj = new Random();
        add(obj.nextInt() % r);
    }
    public void del() {
        Node h = head;
        if (h != null) {
            head = head.next;
            h = null;
        }
    }
    public void print() {
        Node h = head;
        while (h != null) {
            System.out.print(h.val + " ");
            h = h.next;
        }
        System.out.println();
    }
    public void reverse() {
        Node cp = head;
        Node np = head.next;
        head.next = null;
        Node pp;
        while (np != null) {
            pp = cp;
            cp = np;
            np = np.next;
            cp.next = pp;
        }
        head = cp;
    }
    public void delRep() {
        Node outCycle = head;
        Node inCycle;
        while (outCycle != null && outCycle.next != null) {
            inCycle = outCycle;
            while (inCycle.next != null) {
                if (inCycle.next.val == outCycle.val)
                    inCycle.next = inCycle.next.next;
                else inCycle = inCycle.next;
            }
            outCycle = outCycle.next;
        }
    }
 }