Some people say that algorithm problems are too easy, but I think that's because the application part is covered less, not because difficult algorithms are not covered. And while listening to this lecture, I felt that it evenly covers basic problems for solving difficult algorithms. Thanks to the lecture, I started solving Programmers Level 1 to 3 problems little by little. I felt that I could solve them if I just watched this lecture and practiced hard until Level 4. Thank you for the great lecture.