I only solved implementation problems at Bronze difficulty in Baekjoon, but when I tried to challenge the Silver problem, I felt like I couldn't even touch it without learning the algorithm. So I tried various algorithms, but DFS was really hard to get a feel for. I felt like I didn't understand it at all. As those who solve problems know, if I don't completely understand it, I can never make it my own. Then I found this lecture and took the free lecture and it was so good. Thanks to it, I was able to solve all the problems included in the lecture and completely understood them. If it weren't for this lecture, I think I would have spent more time and been stressed out. Thank you. If there's something I wished for more, it would have been good if you had covered the problems up to the Gold level. There were a lot of similar problems, so it was a little disappointing. That's both an advantage and a disadvantage. It can be an advantage for someone who is a beginner at DFS and wants to get a feel for it, but it can be a little disappointing for someone who has a feel for it. However, I'm so happy that I got a feel for DFS thanks to it. Thank you for making the lecture. Have a nice day!