From: Aldric Giacomoni <aldric@...>
Date: 2009-12-04T05:48:01+09:00
Subject: Re: have a problem with the loops and variable

Steve Wilhelm wrote:
> I think what Sajjad wanted was:
> 
> q, w = 1, 2
> s = Array.new(w - q) { 1 }
> 
> It doesn't quite do what the original code attempts, because Sajjad's 
> code starts at array index 1 instead of 0. I do know know if that is 
> what he actually intended or if it is another bug.
> 
> Is there a better way to populate an array with default values using 
> array's each method?

q, w = 1, 2
s = Array.new(w - q) { |i| i.zero? ? 0 : 1 }

How's that? :)
Otherwise, brute-forcing like that is really just using permutations.. 
So how about this?
http://trevoke.net/blog/2008/12/20/lexicographic-permutations-in-ruby/
I didn't include explanations for the code, but you can check out the 
other blog if you'd like. It does the permutation and runs a block for 
each permutations.
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