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Learn Data Structures and Algorithms in Java

Problem: Baseball Game

Understand how to implement a stack data structure in Java to manage scores for a baseball game with special rules. Learn to handle operations such as adding new scores, doubling the last score, summing the last two scores, and invalidating the most recent score, all while ensuring efficient processing and constant-time access to recent elements.

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Statement

You are the scorekeeper for a baseball game with unusual rules. You begin with an empty score record.

You are given a list of string operations, where each operations[i] represents theithi^{th}operation to apply to the record. Each operation is one of the following:

  • An integer x: Record a new score of x.

  • "+": Record a new score equal to the sum of the two most recent scores.

  • "D": Record a new score equal to double the most recent score.

  • "C": Invalidate and remove the most recent score from the record.

Return the sum of all scores remaining on the record after all operations have been ...