IB Computer Science Topic D.4.4 Abstract Data Type (ADT) List Revision Notes (SL/HL)

IB Computer Science Topic D.4.4 Abstract Data Type (ADT) List Revision Notes (SL/HL) | RevisionDojo

Understanding Linked Lists

Linked lists consist of:

Nodes: Each node contains data and a pointer to the next node.
Head: Pointer to the first node in the list.
Tail: The last node, which points to null.

Example

Note

Logical vs physical representation of linked lists:

Logical Representation: How the list is viewed conceptually (nodes and pointers).
Physical Representation: How the list is stored in memory (addresses and data types).

This distinction is an example of abstraction, hiding complex details to focus on essential features.

Advantages of linked lists include:
1. Dynamic Size: Can grow or shrink as needed.
2. Efficient Insertions/Deletions: No need to shift elements, unlike arrays.
Disadvantages of linked lists:
1. Sequential Access: Must traverse the list to access elements.
2. Memory Overhead: Each node requires extra memory for pointers.

Note

Stacks, queues, and graphs can be built using linked lists.

Types of Linked Lists

Singly linked list: Each node points to the next node.

Example

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Understanding Linked Lists

Linked lists consist of:

Nodes: Each node contains data and a pointer to the next node.
Head: Pointer to the first node in the list.
Tail: The last node, which points to null.

Example

Note

Logical vs physical representation of linked lists:

Logical Representation: How the list is viewed conceptually (nodes and pointers).
Physical Representation: How the list is stored in memory (addresses and data types).

This distinction is an example of abstraction, hiding complex details to focus on essential features.

Advantages of linked lists include:
1. Dynamic Size: Can grow or shrink as needed.
2. Efficient Insertions/Deletions: No need to shift elements, unlike arrays.
Disadvantages of linked lists:
1. Sequential Access: Must traverse the list to access elements.
2. Memory Overhead: Each node requires extra memory for pointers.

Note

Stacks, queues, and graphs can be built using linked lists.

Types of Linked Lists

Singly linked list: Each node points to the next node.

Example

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

IB Computer Science D.4.4 Abstract Data Type (ADT) List Notes

1. System fundamentals2 subtopics

2. Computer organization1 subtopic

3. Networks1 subtopic

4. Computational thinking, problem-solving and programming3 subtopics

5. Abstract data structures (HL)1 subtopic

6. Resource management (HL)1 subtopic

7. Control (HL)1 subtopic

A. Databases4 subtopics

B. Modelling and simulation4 subtopics

C. Web science6 subtopics

D. Object-oriented programming (OOP)4 subtopics

Understanding Linked Lists

Types of Linked Lists

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Understanding Linked Lists

Types of Linked Lists

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account