Concept of Linear Queue Using Linked List
Linear Queue: A linear queue is a data structure that follows the First In First Out (FIFO) principle, where elements are added at the rear and removed from the front. Using a linked list to implement a linear queue provides dynamic memory allocation and avoids the fixed size limitation of arrays.
How does it work?
- Each node in the linked list represents an element in the queue.
- The front pointer points to the first node (head) of the queue.
- The rear pointer points to the last node (tail) of the queue.
- Enqueue operation adds a new node at the rear.
- Dequeue operation removes the node at the front.
Important Observations
- Dynamic memory allocation allows the queue to grow or shrink as needed.
- Efficient for scenarios where the size of the queue is unpredictable.
- Does not require shifting elements as in array-based queues.
Key Characteristics:
- FIFO order of operations.
- Uses pointers to manage the front and rear of the queue.
- Efficient memory utilization compared to array-based queues.
Advantages:
- Dynamic size eliminates the need for resizing.
- Efficient insertion and deletion operations.
- Memory is allocated only when needed.
Disadvantages:
- Requires extra memory for storing pointers.
- Pointer manipulation can be error-prone.
Time Complexity:
- Enqueue: O(1) (insertion at the rear).
- Dequeue: O(1) (deletion from the front).