From: Brian Candler <b.candler@...>
Date: 2008-11-05T00:58:07+09:00
Subject: Re: Combination of numbers in an array that add up to x

Hae Lee wrote:
> Objective: Find list of values in an array that adds up to a specific
> sum.
> -
> I have a list of values in an array:
> [2429.63, 497.87, 51.96, 59.43, 138.4, 66.22, 28.74, 1.75, 2075.13,
> 556.14, 112.56, 116.5, 84.41, 55.97, 139.07, 24.46]
> 
> I want to find a combination among these numbers that adds up to a total
> sum of:
> 3435.78
> 
> I was hoping a one-liner in irb would do the trick but I haven't found a
> method, etc. that will help me do this.  Thoughts regarding?

Google "Knapsack problem"

It may be easier if your multiply your numbers up by 100 so you get 
integers.
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