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This approach utilizes a fixed-size array along with two pointers (or indices), front and rear, to maintain the positions within the queue effectively. The idea revolves around using modular arithmetic to effectively wrap around the queue once the end of the array is reached.
Operations like enQueue and deQueue are performed using these pointers, and conditions such as when the queue is full or empty are checked based on the relative position of these pointers.
The time complexity for each operation such as enQueue, deQueue, Front, and Rear is O(1) as they involve simple arithmetic operations. The space complexity is O(k) where k is the size of the queue since we're using a static array.
1#include <stdbool.h>
2
3typedef struct {
4 int *queue;
5 int front;
6 int rear;
7
This C solution defines a structure MyCircularQueue containing an array and variables to keep track of the front, rear, current size, and maximum size. myCircularQueueCreate allocates memory and initializes the queue. The enQueue function checks if the queue is full, updates the rear pointer, and inserts the element. deQueue function checks if the queue is empty and updates the front pointer. Front and rear position values are obtained by accessing respective pointers.
This approach employs a circular linked list to implement the queue, leveraging linked nodes instead of a fixed-size array. The circular nature simplifies the wrap-around, allowing operations with dynamic sizing. Each node in the list holds a value and a reference to the next node, with the last node pointing back to the first, forming a circle.
Such a design accommodates flexible sizing but adds complexity in managing node references for enQueue and deQueue.
The time complexity for each operation is O(1) since they only involve rearranging node pointers. The space complexity is O(k) in the worst case if all queue slots are occupied.
This C solution uses a circular linked list wherein each Node structure holds a value and a next pointer. The MyCircularQueue structure stores front and rear Node pointers along with size information. Insertion (enQueue) and deletion (deQueue) manage node links and pointers accordingly. Circular nature is handled by pointing the last node to the front node.