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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.
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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:
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An integer x - Record a new score of x.
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"+" - Record a new score that is the sum of the previous two scores. It is guaranteed there will always be two previous scores.
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"D" - Record a new score that is double the previous score. It is guaranteed there will always be a previous score.
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"C" - Invalidate the previous score, removing it from the record. It is guaranteed there will always be a previous score.
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Return the sum of all the scores on the record.
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Example 1:
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Input: ops = ["5","2","C","D","+"]
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Output: 30
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Explanation:
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"5" - Add 5 to the record, record is now [5].
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"2" - Add 2 to the record, record is now [5, 2].
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"C" - Invalidate and remove the previous score, record is now [5].
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"D" - Add 2 * 5 = 10 to the record, record is now [5, 10].
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"+" - Add 5 + 10 = 15 to the record, record is now [5, 10, 15].
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The total sum is 5 + 10 + 15 = 30.
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Example 2:
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Input: ops = ["5","-2","4","C","D","9","+","+"]
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Output: 27
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Explanation:
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"5" - Add 5 to the record, record is now [5].
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"-2" - Add -2 to the record, record is now [5, -2].
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"4" - Add 4 to the record, record is now [5, -2, 4].
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"C" - Invalidate and remove the previous score, record is now [5, -2].
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"D" - Add 2 * -2 = -4 to the record, record is now [5, -2, -4].
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"9" - Add 9 to the record, record is now [5, -2, -4, 9].
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"+" - Add -4 + 9 = 5 to the record, record is now [5, -2, -4, 9, 5].
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"+" - Add 9 + 5 = 14 to the record, record is now [5, -2, -4, 9, 5, 14].
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The total sum is 5 +たす-ひく2 +たす-ひく4 +たす 9 +たす 5 +たす 14 =わ 27.
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Example 3:
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Input: ops = ["1"]
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Output: 1
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Constraints:
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1 <= ops.length <= 1000
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ops[i] is "C", "D", "+", or a string representing an integer in the range [-3 * 104, 3 * 104].
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For operation "+", there will always be at least two previous scores on the record.
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For operations "C" and "D", there will always be at least one previous score on the record.
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