Score Validator — Python

# Time:  O(n)
# Space: O(1)

# freq table
class Solution(object):
    def scoreValidator(self, events):
        """
        :type events: List[str]
        :rtype: List[int]
        """
        result = [0]*2
        for x in events:
            if x == "W":
                result[1] += 1
                if result[1] == 10:
                    break
            elif x in ("WD", "NB"):
                result[0] += 1
            else:
                result[0] += int(x)
        return result