leetcode--Letter Combinations of a Phone Number
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class Solution(object):
def letterCombinations(self, digits):
"""
:type digits: str
:rtype: List[str]
"""
if ''==digits:
return []
numsmap={
'2':'abc',
'3':'def',
'4':'ghi',
'5':'jkl',
'6':'mno',
'7':'pqrs',
'8':'tuv',
'9':'wxyz'}
return reduce(lambda acc,digit:[x+y for x in acc for y in numsmap[digit]],digits,[''])
def letterCombinations(self, digits):
"""
:type digits: str
:rtype: List[str]
"""
if ''==digits:
return []
numsmap={
'2':'abc',
'3':'def',
'4':'ghi',
'5':'jkl',
'6':'mno',
'7':'pqrs',
'8':'tuv',
'9':'wxyz'}
return reduce(lambda acc,digit:[x+y for x in acc for y in numsmap[digit]],digits,[''])
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