# 682. Baseball Game
#
# 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:
#
#     An integer x.
#         Record a new score of x.
#     '+'.
#         Record a new score that is the sum of the previous two scores.
#     'D'.
#         Record a new score that is the double of the previous score.
#     'C'.
#         Invalidate the previous score, removing it from the record.
#
# 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.


def calPoints(operations: list[str]) -> int:
    resultado: list[int] = []
    for index in range(len(operations)):
        if operations[index] == "C":
            resultado.pop()
        elif operations[index] == "D":
            resultado.append(resultado[-1] * 2)
        elif operations[index] == "+":
            resultado.append(resultado[-1] + resultado[-2])
        else:
            resultado.append(int(operations[index]))
    return sum(resultado)