From: Jason Mayer <slamboy@...>
Date: 2007-01-15T21:49:05+09:00
Subject: newbie question about sets

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I'm just curious if there's any way to duplicate values in a set.  After
quiz 108, I modified my submission so that it was a fully functional game.
I then passed around my finished program to some of my coworkers who are
interested in ruby.  After a few days, someone came back to me with a bug,
and this appears to be the root cause of that bug.

irb(main):001:0> target = "stuff"
=> "stuff"
irb(main):002:0> a = target.split(//).sort
=> ["f", "f", "s", "t", "u"]
irb(main):003:0> require 'Set'
=> true
irb(main):004:0> s1 = Set.new(a)
=> #<Set: {"f", "s", "t", "u"}>

As it stands, if the word ffffuuuuussssstttt existed, it would be considered
a subset of a.  How do you avoid this using sets?

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