Can you review my profile as well?

Right, it seems you are stuck for a long time, I realize your situation. You could sometimes get rank 400 in div.2, so it at least means you do have the level of it. But you know, the style of problems is different for each contest, it's all designed by the problem setter.

In my opinion, for contestants of a certain level, try to summarise the problems you encountered that you found it difficult. Like graph theory, data structures or mathematics e.t.

If you're always losing in one field, try to relearn it of yourself. I recommend you to see other's blogs to learn more of the algorithm usage. It may broaden your eyes and let you get some incredible insights.

Edit:

If you have some emotional changes after losing a contest, I would suggest that you don't participate in as rated for a while. That would break your passion of learning.

Again, doing the problems by type is still effective, and this gradual approach will allow you to find your confidence faster and then perform superbly!

Well, I checked it. It's worth noting your submission history in the competition.

It shows you usually make one or more submissions without understanding the full problem or guessing at some random idea. This is a fatal problem, which will result in no growth in your rating on codeforces.

If you can't solve the simulation in div.3 or 4, I'm going to say that you can't even code correctly. Pointedly, you focus on the theory of algorithms and lack the practice of algorithms.

Also you don't have any teammates within contest to check your errors, you should first learn to check your errors. It's like when you're in a maths exam and you know all the questions but you just can't get full marks.

Here are some of my suggestions:

1. Don't ‘think you're always right’ when solving problems. Wrong answer means -50 of your real scores.

2. Keep practicing as what you are doing, I know it's a slow way to get results, but it's a process you have to go through. I've noticed that you often skip over some problems to address later ones. Well, you certainly showed your skills, but it's almost impossible to implement the code you envisioned. Don't ignore easy problems until you can think of a solution and finish the code in a very short period of time.

3. Have you truly mastered the basic algorithm? When you see a binary search problem, can you come up with it in 5 minutes? If you can't, this means that you don't have a good enough grasp of basic algorithms, don't think that just because you have learnt some advanced algorithms that basic algorithms are not difficult for you.

You must be good at maths, so algorithms aren't much of a problem for you. Your basic algorithmic skills are solid enough when you can solve all the problems of a div.4 contest within the time limit. So just do it. Don't doubt what you're doing now.

OK, I guess you have recently(less than 1 year) started to study algorithm, I feel it common of you. If you want to make more progress, take a look at my next suggestion.

1. Basic algorithm first. There is no doubt that it's impossible that you can skip this basic theory to reach higher. So practicing more is your first step.

2. Try to learn advanced data structures, such as segment tree. It may be helpful in solving problem D in div.2.

3. To become more proficient in the use of basic data structures. The more problems you solve, the more you understand.

4. You also have the issue of 'too impatient'. I notice you are participating ICPC game, so WA submission may cause a huge difference. You should check:

• Specail cases(like $$$n = 1$$$).
• Int/Array overflow.

These may help. All in all, learning algorithms is a long time one thing, don't worry too much about it, just keep it up.

When you realise the problem and start correcting it, you're not far from victory. Come on!

I'm sad to hear that, but I think you should learn wide at this rating. Don't push yourself too hard, hah. Maybe the ways of your training are not proper.

You don't have more informations on codeforces. I think you are a beginner in this field. So trying more div.3 or div.4 is better. Other way, you should learn widely instead of participating in contests. Things will change if you really learn much.

Learning new things is the first thing, I notice your contest performance is ok, just learn in this rating. Because you have approached to this new field recently.

A fatal problem is that you often made WA submissions in your contest. Have you tried to avoid them? It's time to become more patient and careful. If you can keep solving 3 problems in div.2, you will be fastly reach expert with your ability.

For long time stagnant in specialist is not common, so check if you really understand the basic algorithms. I can't say more for you.