2008脚本大赛PowerShell高级组Event 1解题及分析

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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:Scriptswordlist.txt | ? { (($_.length -eq 7) -and ($_ -imatch "^$charRange+`$")) } | `

%{$key = Map-WordToDigit $_; $hash[$key] = $_}

$phoneNumber = Read-Host "Please enter your phone number"

$hash[$phoneNumber]