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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。
最高位数字存放在数组的首位， 数组中每个元素只存储单个数字。
你可以假设除了整数 0 之外，这个整数不会以零开头。
示例 1： ：
示例 2： ：
'''
class Solution ( object ) :
def _plusOne ( self , digits ) :
"""
:type digits: List[int]
:rtype: List[int]
"""
carry = 1
for i in reversed ( xrange ( 0 , len ( digits ) ) ) :
digit = ( digits [ i ] + carry ) % 10
carry = 1 if digit < digits [ i ] else 0
digits [ i ] = digit
if carry == 1 :
return [ 1 ] + digits
return digits
# 一句话写法，
def plusOne ( self , digits ) :
return [ int ( j ) for j in str ( int ( ' ' . join ( ' %s ' % i for i in digits ) ) + 1 ) ]
