It was a short but concise and informative lecture! It was really satisfying to solve the hackerlink and leetcode problems on my own and get the answer right :) I couldn't even understand the last problem, symmetric pairs, so I ended up having to look up the answer ㅠ All the things I've learned were included, but I don't think I can think about it that way for now. (I'm going to solve the Easy level problems one by one!) I'll move on to the next intermediate problem-solving lecture! Thank you for the helpful lecture.