New RBI Grade B 2025 Notification will come Soon! Enroll Here

    Question

    Which of the following data structures is best suited

    for implementing a LIFO (Last In, First Out) mechanism?
    A Array Correct Answer Incorrect Answer
    B Queue Correct Answer Incorrect Answer
    C Stack Correct Answer Incorrect Answer
    D Binary Tree Correct Answer Incorrect Answer
    E Linked List Correct Answer Incorrect Answer

    Solution

    The stack data structure is specifically designed for implementing the LIFO mechanism, where the last element added to the stack is the first one to be removed. This property is essential for various operations like undo functionality in text editors, parsing expressions in compilers, or tracking function calls in recursion. In a stack, two primary operations are supported: push (to add an element) and pop (to remove an element). These operations are efficient, with a time complexity of O(1)O(1)O(1). A stack can be implemented using either an array or a linked list, but its abstract behavior remains consistent across implementations. Why Other Options Are Incorrect :

    1. Array : While an array can store data in a sequential manner, it doesn’t inherently support LIFO behavior. Accessing and removing elements in LIFO order requires additional operations that are not native to arrays.
    2. Queue : A queue operates on a FIFO (First In, First Out) principle, which is opposite to LIFO. Thus, it is unsuitable for use as a stack.
    3. Binary Tree : Binary trees are hierarchical data structures used for searching and hierarchical representation, not for sequential LIFO operations.
    4. Linked List : A linked list can be used to implement a stack, but by itself, it is not restricted to LIFO behavior.

    Practice Next