You need to implement a queue using two stacks. What is the time complexity of the dequeue operation in the worst-case scenario?
O(n)
O(1)
O(n log n)
O(log n)
Which data structure is commonly used to implement a priority queue where efficient insertion and removal of the highest-priority element are crucial?
Binary Search Tree
Doubly Linked List
Binary Heap
Hash Table
In a circular queue implemented using an array, what is the purpose of the rear pointer?
To point to the element that was most recently enqueued.
To mark the beginning of the queue in the circular array.
To indicate the next available position for enqueuing an element.
To track the number of elements currently present in the queue.
Which of the following data structures can be efficiently used to implement a priority queue?
In the context of Breadth-First Search (BFS), how does a queue help explore a graph?
It facilitates visiting all neighbors of a node before moving to the next level.
It ensures that nodes are visited in a depth-first manner.
It maintains a list of visited nodes to prevent cycles.
It stores the path from the source node to the current node.
How does a queue ensure that elements are processed in the order they were added?
By dynamically allocating memory for each element.
By using a hash function to index elements.
By using a First-In, First-Out (FIFO) approach.
By using a Last-In, First-Out (LIFO) approach.
What is the key advantage of using a linked list implementation for a queue over an array-based implementation?
Dynamic resizing to prevent overflow
Lower memory usage
Easier to implement
Faster enqueue and dequeue operations
Which real-world scenario is best represented using a priority queue?
Scheduling tasks in an operating system based on their priority levels
Managing a print queue where documents are printed in the order they are received
Storing a history of visited web pages in a browser
Maintaining a list of recently used applications
In a priority queue, elements with the same priority are dequeued in what order?
The order they were enqueued
Random order
It depends on the specific priority queue implementation
Sorted order based on an additional attribute
You are designing a system where elements are added and removed from both ends. Which data structure is the most suitable?
Stack
Binary Tree
Queue
Deque