James Gray
2/11/2007 11:31:00 PM
Begin forwarded message:
> From: "Aleksandr Lossenko" <aleksandr.lossenko@gmail.com>
> Date: February 10, 2007 1:50:46 PM CST
> To: submission@rubyquiz.com
> Subject: quiz 113
> Reply-To: Aleksandr.Lossenko@gmail.com
>
> Hello,
>
> here are some solutions for the quiz:
>
> 1) Anagrams (considering that the first word is also an anagram of
> itself)
> # delete every string that is not anagram of the first string
> quiz.delete_if {|x| x.split('').sort.join != quiz[0].split
> ('').sort.join}
>
> 2) Convert an Array of objects to nested Hashes
> # pop 2 elements, make a hash from them, and push the hash back.
> when there is only 1 element, the hash is ready
> quiz << {quiz.pop => quiz.pop}.invert while(quiz.length >1); quiz.pop
>
> 3) Provided with an open File object, select a random line of content.
> # lineno gives the number of lines. use the random function and get
> the line
> quiz.readlines[rand(quiz.lineno)]
>
> 4) Shuffle array
> # take a random element and push it to the top
> quiz.size.downto(1) { |n| quiz << quiz.delete_at(rand(n)) };
>
> 5) wondrous number
> # start with the array containing the first wondrous number and go
> from there
> a=[quiz]; a << (a.last%2==1 ? a.last*3+1 : a.last/2) while a.last!=1
>
> Best Regards,
> Aleksandr Lossenko