In postfix evaluation, what action is taken when an operand is encountered?
It triggers the evaluation of operators on the stack.
It is pushed onto the stack.
It is ignored.
It is immediately evaluated.
What is the purpose of the 'top' pointer in an array-based stack implementation?
To store the maximum size of the stack
To track the index of the next available position for insertion
To store the value of the top element in the stack
To point to the bottom element of the stack
Imagine a stack is used to track function calls in a recursive program. What happens to the stack when a function returns?
The entire stack is cleared.
The corresponding function call is pushed onto the stack.
The stack remains unchanged.
The corresponding function call is popped from the stack.
Which type of linked list allows for more efficient push and pop operations at both ends, making it suitable for implementing a stack?
Singly linked list
Both singly and doubly linked lists are equally efficient.
Circular linked list
Doubly linked list
Consider the scenario of undoing actions in a text editor. Which data structure would be most suitable for implementing an 'undo' feature?
Binary Tree
Linked List
Queue
Stack
Which of the following stack operations has a time complexity of O(1) in both array-based and linked list-based implementations?
Pop
All of the above
Peek
Push
Which of the following operations is NOT typically associated with a Deque?
inject (insert at the front)
pop (remove from the rear)
peek (view the element at the front without removing)
push (insert at the rear)
What is a potential drawback of using a linked list-based stack compared to an array-based stack?
Higher memory usage due to the overhead of storing pointers
Limited stack size
Increased time complexity for push and pop operations
Inability to handle dynamic resizing
What is the time complexity of the 'peek' operation in a well-implemented stack?
O(1)
O(log n)
O(n log n)
O(n)
You need to implement a stack that can store a large number of items and the maximum number of items is unknown. Which implementation would be more suitable?
Stack using a dynamic array
Stack using a doubly linked list
Stack using a fixed-size array
Stack using a singly linked list