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Questions and Answers
What is the main difference between a Singly Linked List and a Doubly Linked List?
What is the main characteristic of a Circularly Linked List?
How can a linked list be implemented?
What is the time complexity of inserting a node at the beginning or end of a linked list?
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What is the purpose of the prev field in a Doubly Linked List?
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What is the main advantage of using a linked list over an array?
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What is the purpose of the next field in a Singly Linked List?
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What is the time complexity of searching for a specific node in a linked list?
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Which of the following is a traversal method used in linked lists?
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What is the purpose of the Node class in a linked list implementation?
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Study Notes
Linked List
Singly Linked List
- A type of linked list where each node only has a reference to the next node in the sequence.
- Each node consists of a data field and a next field (i.e., a reference to the next node).
- The last node in the list has a null reference in its next field, indicating the end of the list.
Doubly Linked List
- A type of linked list where each node has references to both the previous and next nodes in the sequence.
- Each node consists of a data field, a prev field (i.e., a reference to the previous node), and a next field (i.e., a reference to the next node).
- The first node in the list has a null prev field, and the last node has a null next field.
Circularly Linked List
- A type of linked list where the last node points back to the first node, forming a circle.
- Each node consists of a data field and a next field (i.e., a reference to the next node).
- There is no null reference in the list, as the last node points back to the first node.
Linked List Implementation
- A linked list can be implemented using a Node class, which has a data field and a reference to the next node.
- The linked list class itself can have methods for inserting, deleting, and traversing the list.
- The implementation can be done recursively or iteratively.
Linked List Traversal
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Traversal methods:
- Iterative traversal: uses a loop to traverse the list.
- Recursive traversal: uses a recursive function to traverse the list.
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Traversal operations:
- Insertion: adding a new node to the list.
- Deletion: removing a node from the list.
- Searching: finding a specific node in the list.
- Printing: displaying the contents of the list.
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Time complexity:
- Insertion: O(1) at the beginning or end, O(n) at a specific position.
- Deletion: O(1) at the beginning or end, O(n) at a specific position.
- Searching: O(n) in the worst case.
- Printing: O(n) in the worst case.
Linked List
Singly Linked List
- Each node has a data field and a reference to the next node.
- The last node has a null reference, indicating the end of the list.
Doubly Linked List
- Each node has references to both the previous and next nodes.
- Each node consists of a data field, a prev field, and a next field.
- The first node has a null prev field, and the last node has a null next field.
Circularly Linked List
- The last node points back to the first node, forming a circle.
- Each node consists of a data field and a next field.
- There is no null reference in the list.
Implementation
- A Node class has a data field and a reference to the next node.
- The linked list class has methods for inserting, deleting, and traversing the list.
- Implementation can be done recursively or iteratively.
Traversal
Traversal Methods
- Iterative traversal uses a loop to traverse the list.
- Recursive traversal uses a recursive function to traverse the list.
Traversal Operations
- Insertion adds a new node to the list.
- Deletion removes a node from the list.
- Searching finds a specific node in the list.
- Printing displays the contents of the list.
Time Complexity
- Insertion is O(1) at the beginning or end, O(n) at a specific position.
- Deletion is O(1) at the beginning or end, O(n) at a specific position.
- Searching is O(n) in the worst case.
- Printing is O(n) in the worst case.
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Description
This quiz covers the basics of linked lists, including singly and doubly linked lists, and their components.
