At first, I wanted to fill whole profile activity bar with dark green for the meme. It didn't really matter for me what problems I solve to achieve that, so I've been solving 800* problems obviously. Few months in it became a routine and fun way to pass the time.

Because he is PIMP.

About 20 minutes ago

Honestly, yes, there'd been about 2-3 constructive problems at which I had to think about 20 or more minutes. I think there even was one that I had to read editorial for. Sadly I remember none of them.

First of all, I've noticed that my performance at solving Div2 A-C have increased drastically over past year. Another thing is that my ultimate goal is to clear up whole codeforces's problemset which is quite unrealistic, but it's worth a try. Other reasons had been explained above.

can you tell how to open that problems vs ratings graph on codeforces

Depends on the problem, but most of the time I try to solve the problem without editorial until I'm annoyed with the problem or/and I'm not progressing at finding any observations for a long time. Also if I find my approach unnecessary complicated after solving the problem, I read the editorial to check whether there exists some simpler approach.

I will solve them someday when I feel like learning languages like J or Q#.

Edit: I guess Q# is an only issue rn.

I may not be the best person to ask for these things, but since this is AMA... In terms of profile review, I think you're doing good job upsolving contests you're taking part in (at least for recent contests). IMO you should focus on learning DSA on level not higher than segment tree (eg. binary lifting, difference array) and also look out for observations commonly reappearing in problems. (eg. $$$GCD(x, x+1) = 1$$$ or harmonic sequence sum upperbound)

According to you, what is essential in a contest to reach an expert, fast solving DIV2C or solving DIV2D but very slowly?

Depends on contest's rules, but IMO most often solving 4 tasks slowly will be better in terms of ranking rather than fast solving 3

I don't really know what you're asking about, I'm assuming you're asking me about the blank spot you're seeing at activity bar. It is caused by differing timezones, so according to your timezone, I haven't solved any problem that day.

Because some problems are part of special contests that allow only specific language. Example problem

Not really, because there aren't too many concepts that you can base easy problems on. I wouldn't recommend solving these problems for practice to anyone, unless you're a newbie or you really want to practice fast-solving easy problems.

nice job

Thanks for setting up this mashup.

I think most of the things are explained here.

I don't know if I can come up with any more reasons, I just think it is fun way (for me) to pass time. I think the best comparison to this may be solving sudokus. Most commonly people will solve sudokus not for the real challenge, but rather to pass the time, because it's fun to solve them.

Depends on your problem, do you struggle with modelling dp solutions, implementation, or finding optimizations to your dp's?

Chrome extension called CF Analytics

If I manage to ever do that, I think it'll take atleast 2 years from now.

I'll just give some general ideas on how to improve, because it is hard to find your weak spots just by looking at your profile.

• Always upsolve, it is best occasion to learn new things.
• Read editorials after solving tasks. Author's solution may use better approach for the problem.
• Learn STL, C++ is your tool, not an enemy. Mastering it will save you huge amount of time.
• Solve problems from CSES problem set. It has a lot of classical problems you surely will benefit from.

Thanks, but honestly I wouldn't call that an achievement.

It's pretty hard (if not impossible) to point out some particular things that helped me achieved it. I'd say majority of CP-algo is what contributed the most to me.

I'm never making notes on anything (unless i'm making calculations), so no. Whenever I learn new CP concept/algorithm I write it's implementation or solve problem related to it.

My kudos. I wish I had such consistency.

Ye, pretty much.

I would advise you to go for quality rather quantity. Year of green means nothing if you cant do great in contests.

Best of luck