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5.Baseball Game

Description

You're now a baseball game point recorder. Given a list of strings, each string can be one of the 4 following types:

  • Integer (one round's score): Directly represents the number of points you get in this round.
  • "+" (one round's score): Represents that the points you get in this round are the sum of the last two valid round's points.
  • "D" (one round's score): Represents that the points you get in this round are the doubled data of the last valid round's points.
  • "C" (an operation, which isn't a round's score): Represents the last valid round's points you get were invalid and should be removed.

Note

  • Each round's operation is permanent and could have an impact on the round before and the round after.
  • You need to return the sum of the points you could get in all the rounds.
  • The size of the input list will be between 1 and 1000.
  • Every integer represented in the list will be between -30000 and 30000.

Example1

Input: ["5","2","C","D","+"]
Output: 30
Explanation:
Round 1: You could get 5 points. The sum is: 5.
Round 2: You could get 2 points. The sum is: 7.
Operation 1: The round 2's data was invalid. The sum is: 5.  
Round 3: You could get 10 points (the round 2's data has been removed). The sum is: 15.
Round 4: You could get 5 + 10 = 15 points. The sum is: 30.

Example2

Input: ["5","-2","4","C","D","9","+","+"]
Output: 27
Explanation:
Round 1: You could get 5 points. The sum is: 5.
Round 2: You could get -2 points. The sum is: 3.
Round 3: You could get 4 points. The sum is: 7.
Operation 1: The round 3's data is invalid. The sum is: 3.  
Round 4: You could get -4 points (the round 3's data has been removed). The sum is: -1.
Round 5: You could get 9 points. The sum is: 8.
Round 6: You could get -4 + 9 = 5 points. The sum is 13.
Round 7: You could get 9 + 5 = 14 points. The sum is 27.

From

LeetCode