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Create P115. 加一.md
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P115. 加一.md

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***给定一个由 整数 组成的 非空 数组所表示的非负整数,在该数的基础上加一。***
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```
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输入:digits = [1,2,3]
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输出:[1,2,4]
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解释:输入数组表示数字 123。
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```
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```
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class Solution(object):
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def plusOne(self, digits):
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"""
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:type digits: List[int]
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:rtype: List[int]
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"""
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n = len(digits)
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for i in range(n-1, -1, -1):
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digits[i] += 1
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digits[i] %= 10
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if digits[i] != 0:
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return digits
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digits.insert(0,1)
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return digits
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```

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