Data Structures and Algorithms in Java
6th Edition
ISBN: 9781118771334
Author: Michael T. Goodrich
Publisher: WILEY

#### Concept explainers

Question
Chapter 6, Problem 1R
Program Plan Intro

## Stack: Stack is a non-primitive linear data structure. It is a collection of data of any type where insertion and deletion of data take place at one end called as top of the stack. As all the insertion and deletion happens from top of the stack or at one point, stack is also known as Last In First Out (LIFO) type of data structure.

### Explanation of Solution

Stack Operations:

Operations performed on the stack are as follows:

• PUSH
• Adds item to the collection and increases size of the stack.
• POP
• Returns the last item from collection and decreases the size of the stack.
• TOP
• Returns last item from the collection without removing it.

Current size of the Stack, S:

If 3 POP operations returned null, then only 7 POP operations out of 10 decrease the size of the stack. Therefore, the current size of stack is 18 elements since PUSH adds elements, TOP doesn't add or remove elements, and POP removes elements.

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