From: vsv <gm.vlkv@...>
Date: 2008-01-27T17:49:57+09:00
Subject: Re: Making Change (#154)

On Jan 25, 4:24 pm, James Gray <ja...@grayproductions.net> wrote:
> On Jan 25, 2008, at 3:09 PM, Jesús Gabriel y Galán wrote:
>
> > On Jan 25, 2008 9:53 PM, Dominik Honnef <domini...@gmx.net> wrote:
> >> On [Sat, 26.01.2008 00:50], Ruby Quiz wrote:
> >>> In "Practical Ruby Projects," the author includes a couple of
> >>> chapters involving
> >>> coin simulations.  These simulators are used to explore the
> >>> possibilities of
> >>> replacing a certain coin or adding a new coin.
>
> >> Are there any advanced combinations of change/array of coins which
> >> are likely to fail
> >> on some implementations?
>
> > Is it ok to share test cases before the spoiler?
>
> Sure.
>
> James Edward Gray II

I found this combination problematic:
  make_change(1023, (1..10).map{|n| 2**n}) # must be nil