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