I've taken a few other coding test lectures, but there's no lecture as energetic as Bigdol's lecture. When I don't feel like studying, I feel energized when I watch the explanation lecture. I can see that you put a lot of effort into the algorithm textbook. When you first start learning algorithms in C++, you often don't know how much you should study, but this textbook contains all the content you need for algorithms, so it's good. I like that the lectures only explain the key points without long explanations. And they also select good problems, so I don't have to solve useless problems.!