13. If a stack is implemented under a Single-LinkedList, how much time does a stack pop an item outand maintain the top information?а. О(1)b. O(n)с. 0(n?)d. 0(log n)

Deleting a node from the top of stack is referred to as pop operation. Deleting a node from the…

Answered: 13. If a stack is implemented under a…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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13. If a stack is implemented under a Single-
LinkedList, how much time does a stack pop an item out
and maintain the top information?
а. О(1)
b. O(n)
с. 0(n?)
d. 0(log n)

Expert Solution

Step 1

Deleting a node from the top of stack is referred to as pop operation. Deleting a node from the linked list implementation of the stack is different from that in the array implementation. In order to pop an element from the stack, we need to follow the following steps :

Check for the underflow condition: The underflow condition occurs when we try to pop from an already empty stack. The stack will be empty if the head pointer of the list points to null.
Adjust the head pointer accordingly: In stack, the elements are popped only from one end, therefore, the value stored in the head pointer must be deleted and the node must be freed. The next node of the head node now becomes the head node.

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