Ideas for AP project?

I have to make a program using C++ for my AP class. There are a bunch of requirements for it though and one of them is that it needs to have an algorithm that has two algoritms inside of it, one of which has to function independently. It also has to have an abstraction, which I still don't understand (I'm not even sure if it was taught). The problem is that every idea I come up with for it doesn't need two algorithms. Please help?
maybe you could sort something and then search it more efficiently because it was sorted?
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