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Questions and Answers
What happens when the head of a doubly linked list is NULL and a new node is inserted at position 1?
What happens when the head of a doubly linked list is NULL and a new node is inserted at position 1?
- The head is assigned to the new node. (correct)
- The new node is discarded and no insertion occurs.
- The new node's next pointer is set to the old head.
- The new node's prev pointer points to the old head.
Which of the following correctly describes the behavior of the insertAtPos function when the specified position is greater than the current size of the list?
Which of the following correctly describes the behavior of the insertAtPos function when the specified position is greater than the current size of the list?
- It creates a new head for the list.
- It inserts the new node at the beginning of the list.
- It discards the new node without any changes.
- It inserts the new node at the end of the list. (correct)
What is a prerequisite for safely deleting a node from a doubly linked list using deleteAtPos?
What is a prerequisite for safely deleting a node from a doubly linked list using deleteAtPos?
- The position must be equal to the size of the linked list.
- The head of the list must not be NULL.
- The list must have at least one node.
- The position must be less than or equal to the current size of the linked list. (correct)
When a new node is inserted in the middle of a doubly linked list, what must be updated to maintain the list structure?
When a new node is inserted in the middle of a doubly linked list, what must be updated to maintain the list structure?
What does the insertLast function do when a new node is added to a doubly linked list?
What does the insertLast function do when a new node is added to a doubly linked list?
In the deleteAtPos function, which statement is true regarding the head of the list when deleting the first position?
In the deleteAtPos function, which statement is true regarding the head of the list when deleting the first position?
During the insertion of a new node, if the position is specified to be 1, what function is called?
During the insertion of a new node, if the position is specified to be 1, what function is called?
When traversing the list to find the position for insertion, which pointer is used to track the current node?
When traversing the list to find the position for insertion, which pointer is used to track the current node?
What distinguishes a doubly linked list from a singly linked list?
What distinguishes a doubly linked list from a singly linked list?
What is the primary advantage of using a doubly linked list for playing multimedia files?
What is the primary advantage of using a doubly linked list for playing multimedia files?
In the node structure of a doubly linked list, what does the 'prev' pointer refer to?
In the node structure of a doubly linked list, what does the 'prev' pointer refer to?
What would happen if you attempt to insert a new node into a doubly linked list when it's currently empty?
What would happen if you attempt to insert a new node into a doubly linked list when it's currently empty?
Which function correctly calculates the size of a doubly linked list?
Which function correctly calculates the size of a doubly linked list?
When inserting a node at the beginning of a doubly linked list, which pointer must be updated to maintain proper linkage?
When inserting a node at the beginning of a doubly linked list, which pointer must be updated to maintain proper linkage?
In the context of a doubly linked list, what should happen to the 'next' pointer of a newly inserted node when adding it last?
In the context of a doubly linked list, what should happen to the 'next' pointer of a newly inserted node when adding it last?
What is the initial value of the head pointer in an empty doubly linked list?
What is the initial value of the head pointer in an empty doubly linked list?
Flashcards
Doubly Linked List
Doubly Linked List
A data structure where each node stores data and pointers to both the next and previous nodes.
Doubly Linked List Node
Doubly Linked List Node
A single element in a doubly linked list. It contains data and pointers to the next and previous nodes.
Singly Linked List
Singly Linked List
A linear data structure where each element stores data and a pointer to the next element.
Head Pointer (Doubly Linked List)
Head Pointer (Doubly Linked List)
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Insert First (Doubly Linked List)
Insert First (Doubly Linked List)
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Insert Last (Doubly Linked List)
Insert Last (Doubly Linked List)
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Size Function (Doubly Linked List)
Size Function (Doubly Linked List)
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Motivation for Doubly Linked Lists
Motivation for Doubly Linked Lists
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Insert at position
Insert at position
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Insert First
Insert First
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Insert Last
Insert Last
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Delete at position
Delete at position
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Node
Node
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Head
Head
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Size
Size
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Study Notes
Linked Lists
- A linked list is a linear data structure.
- Each element in a linked list is called a node.
- Each node contains two parts:
- Data: The value stored in the node.
- Pointer: A reference to the next node in the list.
Types of Linked Lists
- Singly Linked List: Nodes contain only a pointer to the next node.
- Doubly Linked List: Each node has pointers to both the next and previous node.
Doubly Linked Lists
- Each node points to both its predecessor and successor.
- A next pointer to the successor node.
- A prev pointer to the predecessor node.
Doubly Linked List - Motivation
- Essential for applications requiring "rewind" and "instant replay" features, like video and audio playback.
- Useful for data requiring forward and backward traversal.
Doubly Linked List - Node Definition
- A node structure is defined by:
int data;Stores the data value.struct Node* next;Pointer to the next node.struct Node* prev;Pointer to the previous node.
struct Node* head = NULL;Declares a head pointer.
Linked List Size
int size();Function to return the number of elements in a list.- Initializes a counter to zero.
- Traverses the list using a
currpointer from thehead. - Increments the counter for each node encountered.
- Returns the final count.
Doubly Linked List - Insertion at the Beginning
void insertFirst(int data);- Allocate a new node.
- Initialize
datain the new node. - Set
nextandprevof the new node toNULL. - If the
headis null, the new node becomes thehead. Otherwise, point the new node'snextto the currenthead, and the currenthead'sprevto the new node then make the new node the newhead.
Doubly Linked List - Insertion at the End
void insertLast(int data);- Allocate a new node.
- Initialize
datain the new node. - Set
nextandprevof the new node toNULL. - If the
headis null, the new node becomes thehead. - Otherwise, traverse the list until the last node is reached. Then connect the last node's
nextto the new node and the new node'sprevto the last node.
Doubly Linked List - Insertion at a Specific Position
void insertAtPos(int data, int pos);- Checks for invalid position.
- Implements
insertFirstandinsertLast. - Allocates a new node and initializes the
prevandnextpointers accordingly. - Iterates to the specified position and links the new node in the correct place.
Doubly Linked List - Deletion
void deleteAtPos(int pos);- Checks if position is valid.
- Handles deleting from the beginning, end, and middle.
- Deallocates the node at the specified position.
- Updates pointers to maintain the linked list structure.
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