Yah, that's also a good one. I like the variant that asks how many different ways you can make change for a given amount and a given array of currencies. (I al

Yah, that's also a good one. I like the variant that asks how many different ways you can make change for a given amount and a given array of currencies. (I always feel weird talking about interview questions publicly, but honestly anyone who prepares that diligently deserves to go to the next stage. If anyone's reading this because they're preparing for an interview with me and I ask this question, just mention this comment and I'll be impressed.)