• Implement flip() method that will reverse the elements of your doubly linked list. • You will not be allowed to reassign the head and tail pointers (they should still be your header and trailer sentinels, respectively) but you can still change the values of their next and prev. • Limitation: You are not allowed to remove or add elements or to change the elements of the nodes but you can still change the values of their next and prev.
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- Create a DeleteDuplicatesclass which consists of a deleteDuplicates method which takes the nums list as its parameter. Implement the deleteDuplicates method: Check if the input list is null or empty, and return an empty list if so. Initialize a pointer i to keep track of the unique elements. Use a for loop to Iterate through the list using another pointer j which starts at j=1 and goes until j=nums.size(); If the current element at j is not equal to the previous element at i using !nums.get(i).equals(nums.get(j), increment i and set the current element at j to the new position at i using nums.set(i, nums.get(j)). After the for loop ends, return the sublist from the beginning to i + 1, as this will contain all unique elements. Call the deleteDuplicates method with the sample list as argument: Call the deleteDuplicates method and pass the nums list as argument Store the result in a variable result Print the result to the console. Input: [1, 1, 2, 3, 3,…Build doubly-linked lists using a nested class called DoubleNode, where each node includes a reference to the item before it and the item after it in the list (null if there is no such item). Then put in place static methods for inserting at the start, inserting at the end, removing from the start, removing from the finish, inserting before a given node, inserting after a given node, and removing a given node.Write a method replace to be included in the class KWLinkedList (for doubly linked list) that accepts two parameters, searchItem and repItem of type E. The method searches for searchItem in the doubly linked list, if found then replace it with repItem and return true. If the searchItem is not found in the doubly linked list, then insert repItem at the end of the linked list and return false. Assume that the list is not empty. You can use ListIterator and its methods to search the searchItem in the list and replace it with repItem if found. Do not call any method of class KWLinkedList to add a new node at the end of the list. Method Heading: public boolean replace(E searchItem, E repItem) Example: searchItem: 15 repItem: 17 List (before method call): 9 10 15 20 4 5 6 List (after method call) : 9 10 17 20 4 5 6
- Trying this again since part of my question keeps disappearing Given main() in the ShoppingList class, define an insertAtEnd() method in the ItemNode class that adds an element to the end of a linked list. DO NOT print the dummy head node. Ex. if the input is: 4 Kale Lettuce Carrots Peanuts where 4 is the number of items to be inserted; Kale, Lettuce, Carrots, Peanuts are the names of the items to be added at the end of the list. The output is: Kale Lettuce Carrots Peanuts public class ItemNode { private String item; private ItemNode nextNodeRef; // Reference to the next node public ItemNode() { item = ""; nextNodeRef = null; } // Constructor public ItemNode(String itemInit) { this.item = itemInit; this.nextNodeRef = null; } // Constructor…Implement an instance method, called getFirstHalf, that belongs to yourThingLinkedBag. The method returns as output a linked list that includes allvalues in the first half of the bag's linked list. For example, for the following bag3-->5-->8-->9. the method returns 3-->5.If the bag includes an odd number of nodes, then the middle element belongs tothe first half and is included in the output.Make sure to include the methodheader. The bag should remain unchanged (i.e., do not remove the returnedvalues from the bag).In this task, a skip list data structure should be implemented. You can follow the followinginstructions:- Implement the class NodeSkipList with two components, namely key node and arrayof successors. You can also add a constructor, but you do not need to add anymethod.- In the class SkipList implement a constructor SkipList(long maxNodes). The parameter maxNodes determines the maximal number of nodes that can be added to askip list. Using this parameter we can determine the maximal height of a node, thatis, the maximal length of the array of successors. As the maximal height of a nodeit is usually taken the logarithm of the parameter. Further, it is useful to constructboth sentinels of maximal height.- In the class SkipList it is useful to write a method which simulates coin flip andreturns the number of all tosses until the first head comes up. This number representsthe height of a node to be inserted.- In the class SkipList implement the following methods:(i) insert, which accepts…
- The implementation of a queue in an array, as given in this chapter, uses the variable count to determine whether the queue is empty or full. You can also use the variable count to return the number of elements in the queue. On the other hand, class linkedQueueType does not use such a variable to keep track of the number of elements in the queue. Redefine the class linkedQueueType by adding the variable count to keep track of the number of elements in the queue. Modify the definitions of the functions addQueue and deleteQueue as necessary. Add the function queueCount to return the number of elements in the queue. Also, write a program to test various operations of the class you defined.Implement the complete code Delete that, when given an info value newElement, finds and deletes the first element with this value, if it exists. This involves also considering the four special cases listed for deleting a node from the beginning or the end of a linked list.Implement a class “LinkedList” which has two private data members head: A pointer to the Node class length: length of the linked listImplement the following private method: 1. bool InsertHead(int data); // Use InsertAt FunctionInsert at the start of the linked list. Return true2. bool InsertEnd(int data); // Use InsertAt FunctionInsert at the end of the linked list. Return true3. bool RemoveAt(int index);Remove and delete the node at position “index”. Return true if successful, otherwise, false. this in c++
- implement this method: numOccurrencesRec(LNode node, int n, int key) – This method takes as parameters a reference to the head of a linked list, a position specified by n, and a key. It returns the number of occurrences of the key in the linked list beginning at the n-th node. If n = 0, it means you should search in the entire linked list. If n = 1, then you should skip the first node in the list.Implements clone which duplicates a list. Pay attention, because if there are sublists, they must be duplicated as well. Understand the implementation of the following function, which recursively displays the ids of each node in a list def show_ids(M, level=0): k = M.first_node while k is not None: print(" "*2*level, id(k)) if (str(k.value.__class__.__name__) == str(M.__class__.__name__)): show_ids(k.value, level+1) k = k.next W=L2(Node(10, Node(L2(Node(14, Node(15, Node(L2(Node(16, Node(17))))))), Node(20, Node(30)))) )show_ids(W) Develop your solution as follows: - First copy the nodes of the current list (self) - Create a new list with the copied nodes - Loop through the nodes of the new list checking the value field - If this field is also a list (use isinstance as in the show_ids function) then it calls clone on that list and substitutes the value. Complete the code: def L4(*args,**kwargs): class L4_class(L):…Add more methods to the doubly linked list class then test them• search(e) // Return one node with 3 values (stuID, stuName, stuScore) which matches agiven key e (studentID).• addAfter(e, stuID, stuName, stuScore) //Add a new node with 3 values (stuID,stuName, stuScore) after the node with the key e (studentID).• removeAt(e) //Remove a node which matches a given key e (studentID)• count() //Return a number of nodes of list.• update(stuID, stuName, stuScore) //Update the values of one node first code below package DlinkedList;public class DLinkedList<A,B,C> { private Node<A,B,C> header; private Node<A,B,C> trailer; private int size; public DLinkedList() { header = new Node<>(null, null, null); trailer = new Node<>(null, null, null); header.setNext(trailer); trailer.setPrev(header); } public int getSize() { return size; } public boolean isEmpty() { return size==0; } public A…