http://blog.mrmeyer.com/?p=3001
What is the cheapest way to park for an hour?
What is the most expensive way to park for an hour?
You only have bills, so you ask the nearby store clerk for change. What is the best way for him to give you change for $1 if you want to maximize your parking time? What if the store clerk is running low and doesn't have enough change to give you all coins of the same value?
Is there a systems of inequalities somewhere in here? I can't tell.
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