66. Plus One

题目

Given a non-negative integer represented as a non-empty array of digits, plus one to the integer.

You may assume the integer do not contain any leading zero, except the number 0 itself.

The digits are stored such that the most significant digit is at the head of the list.

解题方案

标签：Array

代码：

class Solution(object):
    def plusOne(self, digits):
        """
        :type digits: List[int]
        :rtype: List[int]
        """
        c = 1
        for i in xrange(len(digits)-1,-1,-1):
            digits[i] += c
            c = 1 if digits[i] == 10 else 0
            digits[i] %= 10
        if c == 1:
            digits.insert(0,1)
        return digits