Abstract Data Type Lists

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Questions and Answers

What happens to the list's tail pointer if the only node is removed?

It points to null. (correct)

It points to the head node.

It points to a new node.

It points to the removed node.

How does the algorithm update curNode's next pointer when removing a node?

It sets curNode's next to null.

It points curNode's next to the head node.

It points curNode's next to the tail node.

It points curNode's next to sucNode. (correct)

What result does the ListSearch algorithm return when a matching node is found?

It returns the matching node itself. (correct)

It returns the data of the matching node.

It returns the next node in the list.

It returns a boolean value indicating success.

When is the method ListSearch expected to return null?

When no nodes contain the matching key. Signup and view all the answers

What condition must be satisfied for the algorithm to remove the tail node?

sucNode must be null. Signup and view all the answers

What is the result after performing 'Append(list, 44)' on the list initialized as (99, 77)?

(99, 77, 44) Signup and view all the answers

Which operation would you use to remove an item from a list?

Remove Signup and view all the answers

What will the 'Search(list, 22)' operation return if the list contains (99, 77)?

null Signup and view all the answers

What is the primary purpose of the 'PrintReverse(list)' operation?

Display the list items in reverse order Signup and view all the answers

When would 'IsEmpty(list)' return true?

When all items are removed Signup and view all the answers

Which of the following accurately describes the role of the list node data structure?

It provides pointers to locate different elements in the list. Signup and view all the answers

What will the 'Sort(list)' operation do to a list initialized with (99, 77, 44)?

Rearrange the items to (44, 77, 99) Signup and view all the answers

Which method can be used to find the total number of items in a list?

GetLength Signup and view all the answers

What happens when you prepend to an empty singly-linked list?

The list's head and tail pointers point to the new node. Signup and view all the answers

What is the outcome of the InsertAfter operation if curNode is null?

The new node becomes the new head and tail of the list. Signup and view all the answers

How does the algorithm behave when inserting after the tail node of a non-empty list?

The tail node's next pointer is updated to the new node. Signup and view all the answers

What does the RemoveAfter operation require to work properly?

A specified existing node in the list. Signup and view all the answers

If you are attempting to remove the head node of a singly-linked list using RemoveAfter, what should the curNode parameter be set to?

Null. Signup and view all the answers

What occurs when attempting to insert in the middle of a singly-linked list?

The new node is linked to curNode's next node. Signup and view all the answers

What is a special case when using RemoveAfter with a null curNode?

The algorithm removes the first node. Signup and view all the answers

In an empty singly-linked list, what is true about the head and tail pointers after a successful prepend?

Both pointers will reference the same new node. Signup and view all the answers

What is the main role of a list data structure in relation to a linked list?

It stores the list's head and tail pointers efficiently. Signup and view all the answers

What happens during the Append operation of a singly-linked list if the list is empty?

Both the head and tail pointers are set to the new node. Signup and view all the answers

What is the time complexity for the space utilized by a linked list data structure?

O(n) for the node pointers and O(1) for the structure. Signup and view all the answers

Which of the following statements is true about the head and tail of a singly-linked list?

The head is the first node and the tail is the last node. Signup and view all the answers

What does 'null' represent in the context of pointers in a singly-linked list?

It denotes a pointer that points to nothing. Signup and view all the answers

What is the effect of the Prepend operation in a singly-linked list?

It adds a new node before the current head node. Signup and view all the answers

How does the Append operation differ for an empty list compared to a non-empty list?

The empty list adjusts both the head and tail pointers to the new node. Signup and view all the answers

What does the term 'singly-linked' imply in a singly-linked list?

Each node points only to the next node. Signup and view all the answers

Study Notes

List Abstract Data Type (ADT)

Lists are common ADTs for ordered data
Operations include appending, removing, searching, and printing
Users don't need to know the internal implementation
Data items can be integers, strings, or objects

List Operations

Append(list, x): Inserts x at the end of the list
Prepend(list, x): Inserts x at the start of the list
InsertAfter(list, w, x): Inserts x after w
Remove(list, x): Removes x
Search(list, x): Returns x if found, otherwise null.
Print(list): Prints list items in order
PrintReverse(list): Prints items in reverse order
Sort(list): Sorts items in ascending order
IsEmpty(list): Returns True if the list is empty, False otherwise

List Data Structure

Typically uses a head and tail pointer for a linked list.
List node data structure is used to store the elements in the list and points to other elements
Optional, to keep track of the list size
Space complexity is O(n) without a specific list structure for the linked list

Singly-Linked Lists

Each node contains the data and a pointer to the next node
Has a head and tail pointer
List elements can have pointers to the next element
Null represents a pointer that does not point to anything

Appending a Node

Append operation inserts a new node after the list's tail node
If the list is empty, the head and tail pointers point to the new node
If the list isn't empty, the tail node's next pointer and the list's tail pointer point to the new node

Prepending a Node

Prepend operation inserts a new node before the list's head node
If the list is empty, the head and tail pointers point to the new node
If the list isn't empty, the new node's next pointer points to the head node, and then the head pointer of the list points to the new node

Inserting a Node

InsertAfter operation inserts a new node after a specified existing node in the list.
If the list is empty, inserts a new node as the first node with head and tail pointers pointing to the node.
If the node to insert after is the tail node, the tail node's pointer to the next insert the new node, and make the new node the new tail node.
If the node to insert after is not the tail node, the new node's next pointer points to the next node, and make the curNode's next pointer points to the new node.

Removing a Node

RemoveAfter operation removes the node after a specified existing node in the list
Removes the first node if the input node is null
If the specified node has no following node, the tail pointer should change to the previous node

Linked List Search

Search(list, key) returns the first node matching the key, or null if not found
Starts at the head node, checks the node's data, if it doesn't match the key then move to the next node.
If the node is null, return null.

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Description

This quiz covers the concepts of List Abstract Data Types (ADT) and their operations. Topics include appending, removing, searching, and printing elements in a list, as well as the structure of a linked list. Test your knowledge on these fundamental programming concepts!