What key advantage does a Deque (Double-ended Queue) offer over a Stack?
Deque allows insertions only at one end.
Deque allows deletions only at one end.
Deque is more memory-efficient than a Stack.
Deque allows insertions and deletions at both ends.
What is the purpose of the 'top' pointer in an array-based stack implementation?
To point to the bottom element of the stack
To track the index of the next available position for insertion
To store the maximum size of the stack
To store the value of the top element in the stack
How do stacks facilitate backtracking in algorithms?
By providing a mechanism for parallel processing.
By storing the optimal solution found so far.
By maintaining a record of visited states and enabling the algorithm to revert to previous states.
By optimizing the search space for the algorithm.
What is the result of evaluating the prefix expression '-+5*234'?
-17
-7
17
7
During the infix to postfix conversion of the expression 'A+B*C-D/E', which operator would be pushed onto the stack first?
/
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 fixed-size array
Stack using a dynamic array
Stack using a singly linked list
Stack using a doubly linked list
How are stacks utilized in syntax parsing within compilers?
For storing the symbol table of variables.
To generate intermediate code during compilation.
For performing code optimization.
To check for matching parentheses, braces, and brackets.
Which type of linked list allows for more efficient push and pop operations at both ends, making it suitable for implementing a stack?
Doubly linked list
Both singly and doubly linked lists are equally efficient.
Singly linked list
Circular 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
Queue
Stack
Linked List
In a stack implemented using a singly linked list, which end of the list typically represents the top of the stack?
It can be either the head or the tail, depending on the implementation.
Head
Tail
Middle