Building Java Programs: A Back To Basics Approach (5th Edition)
Building Java Programs: A Back To Basics Approach (5th Edition)
5th Edition
ISBN: 9780135471944
Author: Stuart Reges, Marty Stepp
Publisher: PEARSON
Question
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Chapter 14, Problem 17E
Program Plan Intro

Compression of stack

Program plan:

  • Import necessary packages.
  • Create a class “CompressedStack”,
    • Define the method “compressDuplicates ()” that accepts stack of integers,
      • Construct “LinkedList” object.
      • Execute till stack becomes empty,
        • Transfer all the elements from stack to queue.
      • Execute till queue becomes empty,
        • Transfer all the elements from queue to stack.
      • Execute till stack becomes empty,
        • Transfer all the elements from stack to queue.
      • Check whether the queue is non-empty,
        • Assign the first element removed from the queue.
        • Set duplicate count to “1”.
        • Execute till queue becomes empty,
          • Assign the nest element removed from the queue.
          • Check whether both removed elements are equal,
            • Increment the duplicate count by “1”.
          • Otherwise,
            • Insert the duplicate count into stack.
            • Insert the first element removed from the queue into the stack.
            • Set the duplicates count to “1”.
            • Set the second element to previous element.
              • Insert the duplicate count to the stack.
              • Insert the duplicated element into the stack.
      • Print the stack with a count of number of duplicates and the duplicated value.
    • Define the method “main()”,
      • Construct “Stack” object.
      • Add integers into the stack.
      • Print the stack of integers.
      • Call the method “compressDuplicates()” with stack as parameter.

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