Number of Times Binary String Is Prefix-Aligned LeetCode solution in Python

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class Solution:
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    def numTimesAllBlue(self, flips: List[int]) -> int:
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        l = len(flips)
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        s = 0
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        c = 0
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        for i in range(len(flips)):
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            f = flips[i]
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            s = 1 << (f - 1) | s
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            if s == (1 << (i + 1)) - 1:
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                c += 1
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        return c