Watch 10 video solutions for Baseball Game, a easy level problem involving Array, Stack, Simulation. This walkthrough by NeetCode has 39,287 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
You are keeping the scores for a baseball game with strange rules. At the beginning of the game, you start with an empty record.
You are given a list of strings operations, where operations[i] is the ith operation you must apply to the record and is one of the following:
x.
x.'+'.
'D'.
'C'.
Return the sum of all the scores on the record after applying all the operations.
The test cases are generated such that the answer and all intermediate calculations fit in a 32-bit integer and that all operations are valid.
Example 1:
Input: ops = ["5","2","C","D","+"] Output: 30 Explanation: "5" - Add 5 to the record, record is now [5]. "2" - Add 2 to the record, record is now [5, 2]. "C" - Invalidate and remove the previous score, record is now [5]. "D" - Add 2 * 5 = 10 to the record, record is now [5, 10]. "+" - Add 5 + 10 = 15 to the record, record is now [5, 10, 15]. The total sum is 5 + 10 + 15 = 30.
Example 2:
Input: ops = ["5","-2","4","C","D","9","+","+"] Output: 27 Explanation: "5" - Add 5 to the record, record is now [5]. "-2" - Add -2 to the record, record is now [5, -2]. "4" - Add 4 to the record, record is now [5, -2, 4]. "C" - Invalidate and remove the previous score, record is now [5, -2]. "D" - Add 2 * -2 = -4 to the record, record is now [5, -2, -4]. "9" - Add 9 to the record, record is now [5, -2, -4, 9]. "+" - Add -4 + 9 = 5 to the record, record is now [5, -2, -4, 9, 5]. "+" - Add 9 + 5 = 14 to the record, record is now [5, -2, -4, 9, 5, 14]. The total sum is 5 + -2 + -4 + 9 + 5 + 14 = 27.
Example 3:
Input: ops = ["1","C"] Output: 0 Explanation: "1" - Add 1 to the record, record is now [1]. "C" - Invalidate and remove the previous score, record is now []. Since the record is empty, the total sum is 0.
Constraints:
1 <= operations.length <= 1000operations[i] is "C", "D", "+", or a string representing an integer in the range [-3 * 104, 3 * 104]."+", there will always be at least two previous scores on the record."C" and "D", there will always be at least one previous score on the record.