# Introduction In this challenge, we will be working with a course management program that deals with two types of courses: free courses and VIP courses. The program is already implemented, but it contains some bugs that need fixing. Our goal is to ensure that the program can be compiled and run correctly, and that the output matches the expected output. To do this, we will need to understand concepts such as polymorphism, inheritance, and member access permissions. Let's dive in and fix those bugs!
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