{ "data": { "question": { "questionId": "682", "questionFrontendId": "682", "categoryTitle": "Algorithms", "boundTopicId": 1819, "title": "Baseball Game", "titleSlug": "baseball-game", "content": "

You are keeping score for a baseball game with strange rules. The game consists of several rounds, where the scores of past rounds may affect future rounds' scores.

\n\n

At the beginning of the game, you start with an empty record. You are given a list of strings ops, where ops[i] is the ith operation you must apply to the record and is one of the following:

\n\n
    \n\t
  1. An integer x - Record a new score of x.
    2. \n\t
  2. "+" - Record a new score that is the sum of the previous two scores. It is guaranteed there will always be two previous scores.
    3. \n\t
  3. "D" - Record a new score that is double the previous score. It is guaranteed there will always be a previous score.
    4. \n\t
  4. "C" - Invalidate the previous score, removing it from the record. It is guaranteed there will always be a previous score.
    5. \n
\n\n

Return the sum of all the scores on the record. The test cases are generated so that the answer fits in a 32-bit integer.

\n\n

 

\n

Example 1:

\n\n
\nInput: ops = ["5","2","C","D","+"]\nOutput: 30\nExplanation:\n"5" - Add 5 to the record, record is now [5].\n"2" - Add 2 to the record, record is now [5, 2].\n"C" - Invalidate and remove the previous score, record is now [5].\n"D" - Add 2 * 5 = 10 to the record, record is now [5, 10].\n"+" - Add 5 + 10 = 15 to the record, record is now [5, 10, 15].\nThe total sum is 5 + 10 + 15 = 30.\n
\n\n

Example 2:

\n\n
\nInput: ops = ["5","-2","4","C","D","9","+","+"]\nOutput: 27\nExplanation:\n"5" - Add 5 to the record, record is now [5].\n"-2" - Add -2 to the record, record is now [5, -2].\n"4" - Add 4 to the record, record is now [5, -2, 4].\n"C" - Invalidate and remove the previous score, record is now [5, -2].\n"D" - Add 2 * -2 = -4 to the record, record is now [5, -2, -4].\n"9" - Add 9 to the record, record is now [5, -2, -4, 9].\n"+" - Add -4 + 9 = 5 to the record, record is now [5, -2, -4, 9, 5].\n"+" - Add 9 + 5 = 14 to the record, record is now [5, -2, -4, 9, 5, 14].\nThe total sum is 5 + -2 + -4 + 9 + 5 + 14 = 27.\n
\n\n

Example 3:

\n\n
\nInput: ops = ["1"]\nOutput: 1\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "棒球比赛", "translatedContent": "

你现在是一场采用特殊赛制棒球比赛的记录员。这场比赛由若干回合组成，过去几回合的得分可能会影响以后几回合的得分。

\n\n

比赛开始时，记录是空白的。你会得到一个记录操作的字符串列表 ops，其中 ops[i] 是你需要记录的第 i 项操作，ops 遵循下述规则：

\n\n
    \n\t
  1. 整数 x - 表示本回合新获得分数 x
    2. \n\t
  2. \"+\" - 表示本回合新获得的得分是前两次得分的总和。题目数据保证记录此操作时前面总是存在两个有效的分数。
    3. \n\t
  3. \"D\" - 表示本回合新获得的得分是前一次得分的两倍。题目数据保证记录此操作时前面总是存在一个有效的分数。
    4. \n\t
  4. \"C\" - 表示前一次得分无效，将其从记录中移除。题目数据保证记录此操作时前面总是存在一个有效的分数。
    5. \n
\n\n

请你返回记录中所有得分的总和。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：ops = [\"5\",\"2\",\"C\",\"D\",\"+\"]\n输出：30\n解释：\n\"5\" - 记录加 5 ，记录现在是 [5]\n\"2\" - 记录加 2 ，记录现在是 [5, 2]\n\"C\" - 使前一次得分的记录无效并将其移除，记录现在是 [5].\n\"D\" - 记录加 2 * 5 = 10 ，记录现在是 [5, 10].\n\"+\" - 记录加 5 + 10 = 15 ，记录现在是 [5, 10, 15].\n所有得分的总和 5 + 10 + 15 = 30\n
\n\n

示例 2：

\n\n
\n输入：ops = [\"5\",\"-2\",\"4\",\"C\",\"D\",\"9\",\"+\",\"+\"]\n输出：27\n解释：\n\"5\" - 记录加 5 ，记录现在是 [5]\n\"-2\" - 记录加 -2 ，记录现在是 [5, -2]\n\"4\" - 记录加 4 ，记录现在是 [5, -2, 4]\n\"C\" - 使前一次得分的记录无效并将其移除，记录现在是 [5, -2]\n\"D\" - 记录加 2 * -2 = -4 ，记录现在是 [5, -2, -4]\n\"9\" - 记录加 9 ，记录现在是 [5, -2, -4, 9]\n\"+\" - 记录加 -4 + 9 = 5 ，记录现在是 [5, -2, -4, 9, 5]\n\"+\" - 记录加 9 + 5 = 14 ，记录现在是 [5, -2, -4, 9, 5, 14]\n所有得分的总和 5 + -2 + -4 + 9 + 5 + 14 = 27\n
\n\n

示例 3：

\n\n
\n输入：ops = [\"1\"]\n输出：1\n
\n\n

 

\n\n

提示：

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