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POFunction to calculate smallest set of zip codes in which all zip codes are within x miles
 

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    1. USpguardiario
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    1. COso you start with locations **S** = {xy0, xy1, xy2, ...} and you want to find a subset {a0, a1, ...} such that *dist*(a0, a(**n**)) < 20 for all **n**? This problem is only hard if you want the **largest** subset - the smallest subset is either the empty set or any single member, if the empty set isn't allowed...
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    2. CONo I want the smallest subset in which every member of the original set is within 20 miles of a member of the subset. I would settle for any small subset. Thanks.
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    3. COOh sorry, I understand now. You want a subset {a0, a1, ...} such that for every **n** = 0, 1, ..., N in the original set, there exists an **m** which satisfies dist(xy(**n**), a(**m**)) < 20. I'll have a go at this.
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