1
class Solution:
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    def plusOne(self, digits: List[int]) -> List[int]:
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        for i in range(len(digits) - 1, -1, -1):
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            if digits[i] == 9:
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                digits[i] = 0
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            else:
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                digits[i] = digits[i] + 1
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                return digits
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        return [1] + digits