LinkedList

import java.util.*;

public class LinkedList
{
    public Node head;
    public Node tail;

    public LinkedList()
    {
        head = null;
        tail = null;
    }

    public void addInTail(Node item) {
        // write your code here
    }

    public Node find(int value) {
        // write your code here
        return null;
    }

    public ArrayList<Node> findAll(int value) {
        ArrayList<Node> nodes = new ArrayList<>();
        // write your code here
        return nodes;
    }

    public boolean remove(int value) {
        // write your code here
        return false;
    }

    public void removeAll(int _value) {
        // write your code here (optional)
    }

    public void clear() {
        // write your code here
    }

    public int count()
    {
        int count = 0;
        // write your code here
        return count;
    }

    public void insertAfter(Node nodeAfter, Node nodeToInsert) {
        // write your code here
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append("[");
        Node node = this.head;
        while (node != null) {
            String stringVal = this.tail == node ? String.valueOf(node.value) : node.value + ", ";
            builder.append(stringVal);
            node = node.next;
        }
        builder.append("]");

        return builder.toString();
    }
}

class Node
{
    public int value;
    public Node next;
    public Node(int _value)
    {
        value = _value;
        next = null;
    }
}