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+# 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)