The lecture materials are only the ones needed for the coding test, so I could see how much effort the instructor put into it. And I didn't have to solve all the level-specific problems on Baekjoon, and just solved the recommended problems, which helped me a lot. (Of course, it's not easy, so it takes some time... It's a problem with my skillsㅜㅜ) The best part is the instructor's feedback.... I think there's no better algorithm lecture than this one, because he always answers within a day and checks and fixes even the complicated codes one by one!