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\nAt 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:
x - Record a new score of x."+" - Record a new score that is the sum of the previous two scores. It is guaranteed there will always be two previous scores."D" - Record a new score that is double the previous score. It is guaranteed there will always be a previous score."C" - Invalidate the previous score, removing it from the record. It is guaranteed there will always be a previous score.Return the sum of all the scores on the record.
\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\n1 <= ops.length <= 1000ops[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.Compiled with clang 11 using the latest C++ 17 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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