本文介绍了一种使用PowerShell将特定字母组合映射到电话按键数字的方法。通过创建一个哈希表来存储从单词到数字的转换结果，使得可以根据用户输入的电话号码快速查找对应的单词。
中文题目位置: http://www.microsoft.com/technet/scriptcenter/funzone/games/games08/chs/aevent1.mspx
英文解题: http://www.microsoft.com/technet/scriptcenter/funzone/games/solutions08/apssol01.mspx
题目比较容易, 官方解题思路很好. 我的办法
Map-WordToDigit可以将一组字符映射为键盘上的数字. 然后将wordlist.txt中符合要求的单词(长度为7, 并且只包含规定的字符)利用Map-WordToDigit变换为对应的电话号码. 这样hash表的键是电话号码, 而值是单词. 最后利用用户输入的电话直接在hash表中查找即可. 唯一注意的就是PowerShell中对字符串的迭代要求显示取得迭代器.
$ofs
=
''
$hash
=
@{}
$maps
=
@{a
=
2
;b
=
2
; c
=
2
;d
=
3
;e
=
3
;f
=
3
;g
=
4
;h
=
4
;i
=
4
;j
=
5
;k
=
5
;l
=
5
;m
=
6
;n
=
6
;o
=
6
;p
=
7
;r
=
7
;s
=
7
;t
=
7
;u
=
8
;v
=
8
;w
=
9
;x
=
9
;y
=
9
;}
#
construct a regular expression characters range
$charRange
=
"
[$($maps.keys)]
"
function
Map
-
WordToDigit (
$word
){
$digits
=
$word
.
GetEnumerator()
|
%
{
$maps
[
$_
.
ToString()] };
"
$digits
"
;}
#
dirty pipeline to cache all of valid words in wordlist.txt.
Get
-
Content
-
Path C
:
Scripts
wordlist
.
txt
|
?
{ ((
$_
.
length
-
eq
7
)
-
and (
$_
-
imatch
"
^$charRange+`$
"
)) }
|
`
%
{
$key
=
Map
-
WordToDigit
$_
;
$hash
[
$key
]
=
$_
}
$phoneNumber
=
Read
-
Host
"
Please enter your phone number
"
$hash
[
$phoneNumber
]
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