Count the Hidden Sequences LeetCode solution in Python

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class Solution:
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    def numberOfArrays(self, differences: List[int], lower: int, upper: int) -> int:
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        l = [0]
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        for i in differences:
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            l.append(l[-1] + i)
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        return max(0, (upper - lower + 1) - (max(l) - min(l)))