Gavin Kistner wrote:
> On Nov 7, 8:12 am, Johnson Wang <99... / 163.com> wrote:
>> file.
>> Definition
> 
> This smells like a homework problem, so roughly:
> Scan the string for groups of consecutive clusters.
> Sort the clusters by length.
> Iterate through the sorted group adding up the sizes and incrementing
> a counter until you reach or exceed your goal.

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In fact,this is not a homework but a test question by Topcoder.
I am a student at the same time a ruby learner.I have solved this 
problem with Java language.`Cause i am a newbie to Ruby,so i don`t know 
how to do it.So here i am and ask for help.
Its not a homework,definitely. ^^
If u r Java developer,of course u know how to solve this 
problem.btw,it`s more convenient if u use Jakarta Commons lib 
package.(commons-lang-2.3.jar)
Tks for your answer.
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