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# 4.9. Complex Recursive Problems

In the previous sections we looked at some problems that are relatively
easy to solve and some graphically interesting problems that can help
us gain a mental model of what is happening in a recursive algorithm. In
this section we will look at some problems that are really difficult to
solve using an iterative programming style but are very elegant and easy
to solve using recursion. We will finish up by looking at a deceptive
problem that at first looks like it has an elegant recursive solution
but in fact does not.

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