QUESTION 4 Consider the nodes in a linked list that store integer values. What must be true for the last node? O Its value must be zero The reference to its next node must be null It cannot participate in list insertion operations O We must be able to reach it directly from the head reference QUESTION 5 Suppose that we need to write a Song class that should use the Comparable interface. What is the best declaration to use? O public interface Comparable utilizes Song {. public class Comparable extends Song {. O public class Song extends Comparable { .. public class Song implements Comparable { . QUESTION 6 What is the run time associated with doing a lookup in a HashMap? O(1), due to the operation of the hash function O(n), where n is the number of keylvalue pairs O(n), where n is the number of keys O o(n2), if we assume an underlying linked list implementation

QUESTION 4 Consider the nodes in a linked list that store integer values. What must be true for the last node? O Its value must be zero The reference to its next node must be null It cannot participate in list insertion operations O We must be able to reach it directly from the head reference QUESTION 5 Suppose that we need to write a Song class that should use the Comparable interface. What is the best declaration to use? O public interface Comparable utilizes Song {. public class Comparable extends Song {. O public class Song extends Comparable { .. public class Song implements Comparable { . QUESTION 6 What is the run time associated with doing a lookup in a HashMap? O(1), due to the operation of the hash function O(n), where n is the number of keylvalue pairs O(n), where n is the number of keys O o(n2), if we assume an underlying linked list implementation

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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You may find a doubly-linked list implementation below. Our first class is Node which we can make a new node with a given element. Its constructor also includes previous node reference prev and next node reference next. We have another class called DoublyLinkedList which has start_node attribute in its constructor as well as the methods such as: 1. insert_to_empty_list() 2. insert_to_end() 3. insert_at_index() Hints: Make a node object for the new element. Check if the index >= 0.If index is 0, make new node as head; else, make a temp node and iterate to the node previous to the index.If the previous node is not null, adjust the prev and next references. Print a message when the previous node is null. 4. delete_at_start() 5. delete_at_end() . 6. display() the task is to implement these 3 methods: insert_at_index(), delete_at_end(), display(). hint on how to start thee code # Initialize the Node class Node: def __init__(self, data): self.item = data…
Using java, write an easier version of a linked list with only a couple of the normal linked list functions and the ability to generate and utilize a list of ints. The data type of the connection to the following node can be just Node, and the data element can be just an int. You will need a reference like (Java) or either a reference to the first node, as well as one to the last node. (Answer the following questions) 1) Create a method or function that accepts an integer, constructs a node with that integer as its data value, and then includes the node to the end of the list. If the new node is the first one, this function will also need to update the reference to the first node. This function will need to update the reference to the final node. Consider how to insert the new node following the previous last node, and keep in mind that the next reference for the list's last node should be null. 2) Create a different method or function that iteratively explores the list, printing…
Question 7 The method(s) with signature(s) defined in the Comparator interface is/are: Question 11 To simplify list processing, a header node is defined as a placeholder node at the beginning of a list and a trailer node is defined as a placeholder node at the end of the list. When a list is empty, which statement is NOT correct? Question 18 True or False? When an object of class ArrayCollection represents an empty collection, its numElements variable is 0. Question 20 True or False? If N represents the number of elements in the collection, then the add method of the SortedArrayCollection clas Question 21 True or False? Our LBList class inherits from the ABList class.
Question 30 If N represents the number of elements in the list, then the index-based add method of the LBList class is O(N). True False Question 31 A header node does not contain actual list information. True False Question 32 Any class that implements the Comparable interface must provide a compareTo method. True False Question 33 A SortedABList list can only be kept sorted based on the "natural order" of its elements. True False Question 34 O(N) is the order of growth execution time of the add operation when using the SortedArrayCollection class, assuming a collection size of N. True False Question 35 The iterator operation is required by the Iterable interface. Group of answer choices True False Question 36 O(N) is the order of growth execution time of the remove operation when using the SortedArrayCollection class, assuming a collection size of N. True False Question 37 O(N) is the order of growth execution time of the index-based add operation when…
There’s a somewhat imperfect analogy between a linked list and a railroad train, where individual cars represent links. Imagine how you would carry out various linked list operations, such as those implemented by the member functions insertFirst(), removeFirst(), and remove(int key) from the LinkList class in this hour. Also implement an insertAfter() function. You’ll need some sidings and switches. You can use a model train set if you have one. Otherwise, try drawing tracks on a piece of paper and using business cards for train cars.
In Java. The following is a class definition of a linked list Node:class Node{int info;Node next;}Show the instructions required to create a linked list that is referenced by head and stores in order, the int values 13, 6 and 2. Assume that Node's constructor receives no parameters.
1)Write a Java program which stores three values by using singly linked list.- Node class1. stuID, stuName, stuScore, //data fields2. constructor3. update and accessor methods- Singly linked list class which must has following methods:1. head, tail, size// data fields2. constructor3. update and accessor methodsa. getSize() //Returns the number of elements in the list.b. isEmpty( ) //Returns true if the list is empty, and false otherwise.c. getFirstStuID( ), getStuName( ), getFirstStuScore( )d. addFirst(stuID, stuName, stuScore)e. addLast(stuID, stuName, stuScore)f. removeFirst ( ) //Removes and returns the first element of the list.g. displayList( ) //Displays all elements of the list by traversing the linked list.- Test class – initialize a singly linked list instance. Test all methods of singly linked list class. 2. Write a Java program which stores three values by using doubly linked list.- Node class4. stuID, stuName, stuScore, //data fields5. constructor6. update and…
Consider the following piece of pseudocode:new DynamicArray dd[1] ← 1d[2] ← 2d[3] ← 3d[2] ← Ød[1] ← ØWhich of the following describes a linked list implementation of this pseudocode?a. Create a new empty linked list, insert a node (with value 1) with next pointer to null, insert a node (with value 2) at the end of list, insert a node (with value 3) at the end of list, remove end node.b. reate a new empty linked list, insert a node (with value 1) with next pointer to null, insert a node (with value 2) at the end of list, insert a node (with value 3) at the end of list, remove middle node, remove first node.c. Create a new empty linked list, insert a node (with value 1) with next pointer to null, insert a node (with value 2) at the beginning of list, insert a node (with value 3) at the end of list, remove end node.
c)Define a class that implementsa singly linked list with the following methods, assuming that the first node of a linked list is referred to by head:i) A constructor.ii) searchNode that takes asparameter an integer value and returns a reference to the node with that value if it is found,and null otherwise. i)addlnOrder that allows insertion of a node to the linked list such that the list remainssorted in ascendingorder.iv) displayList which displays all the nodes in the linked list.d) Assuming that the class defined in part (c) aboveis used to implement a queueofpositive integers, define the following methods which can be used to implement queueoperations:i) isEmptythat returns true if the queue is empty andfalse otherwise.ii) pop that returns the value of the first node if the linked list is not empty,and -1 otherwise.iii) push that takes as parameteran integer value and adds it to the end of the queue.
(Implement a doubly linked list) The MyLinkedList class used in Listing 24.6 is a one-way directional linked list that enables one-way traversal of the list. Modify the Node class to add the new data field name previous to refer to the previous node in the list, as follows:public class Node<E> { E element; Node<E> next; Node<E> previous;public Node(E e) { element = e; } }Implement a new class named TwoWayLinkedList that uses a doubly linked list to store elements. The MyLinkedList class in the text extends MyAbstractList. Define TwoWayLinkedList to extend the java.util.AbstractSequentialList class. You need to implement all the methods defined in MyLinkedList as well as the methods listIterator() and listIterator(int index). Both return an instance of java.util. ListIterator<E>. The former sets the cursor to the head of the list and the latter to the element at the specified index.
Implement a simple linked list in Python (Write source code and show output) with basic linked list operations like: (a) create a sequence of nodes and construct a linear linked list. (b) insert a new node in the linked list. (b) delete a particular node in the linked list. (c) modify the linear linked list into a circular linked list. Use this template: class Node:def __init__(self, val=None):self.val = valself.next = Noneclass LinkedList:"""TODO: Remove the "pass" statements and implement each methodAdd any methods if necessaryDON'T use a builtin list to keep all your nodes."""def __init__(self):self.head = None # The head of your list, don't change its name. It shouldbe "None" when the list is empty.def append(self, num): # append num to the tail of the listpassdef insert(self, index, num): # insert num into the given indexpassdef delete(self, index): # remove the node at the given index and return the deleted value as an integerpassdef circularize(self): # Make your list circular.…
Implement a program that creates an unsorted list by using a linked list implemented by yourself. NOT allowed to use LinkedList class or any other classes that offers list functions. It is REQUIRED to use an ItemType class and a NodeType struct to solve this. Use C++! The “data.txt” file has three lines of data 100, 110, 120, 130, 140, 150, 160 100, 130, 160 1@0, 2@3, 3@END You need to create an empty unsorted list add the numbers from the first line to list using putItem() function. Then print all the current keys to command line in one line using printAll(). delete the numbers given by the second line in the list by using deleteItem() function. Then print all the current keys to command line in one line using printAll().. putItem () the numbers in the third line of the data file to the corresponding location in The list. For example, 1@0 means adding number 1 at position 0 of the list. Then print all the current keys to command line in one line…