That sounds like a great idea. However, I don't keep any record of what I have collected. For interesting stuff I've read, I pretty much either use it for problem-setting, problem-solving, or just bookmark it in my browser. Maybe it'll be worth digging into my bookmarks for that.

I'll have to go through my solved problems for this. Since there are a lot of such problems (running into thousands), I don't think I'll be able to do anything more than briefly skim through them. Some of the more memorable tasks I've solved were during testing contests, since you get a lot more time to solve harder problems and you can discuss stuff in depth, so perhaps that could be a good blog idea.

I think I've been way too out of touch with how a newbie (not in the codeforces sense) thinks to write about something like that. I used to think about this stuff when I was doing math olympiads, and had written some handouts about solving geometry problems specifically, but I think I've internalized a lot of the thought processes I have to an extent where it's not possible for me to motivate it naturally without just saying "do you remember this problem that I solved in the past?". Still, I think there are a lot of amazing blogs on that topic. This is a blog that I enjoyed reading that also talked about such ideas. Similarly, there's Pranav Sriram's Olympiad Combinatorics book that took such an approach. Even on codeforces, there are some nice blogs in the catalog that do the same.

Thanks for reminding me of this. I had been planning on writing about this for about a year now, never actually got to writing it.

Nice pun. I think you can learn a lot about random walks just by studying a bit about discrete time Markov chains, recurrences and martingales. I'll keep this topic in mind though!

I merely moved on from participating in competitive programming contests, the same way people move on from other kinds of hobbies. I don't think 1) is true; I'm happy with the kind of problem-solving that my job entails, and the WLB is good. 2) doesn't really matter for me, I'm okay with not being red. It boils down to how much work you're willing to put into improving yourself at competitive programming and I don't have any motivation to do so.