A Community-Driven Problem Solving Guide For Codeforces

Contribute First. Read This After.

This blog is not a finished tutorial.

This blog is an invitation.

If you have ever opened a Codeforces problem, stared at it for 20 minutes, and thought:

"I know some algorithms... so why can I still not start?"

then this repository is for you.

GitHub Repository

Inside that repository there is a .txt invitation file.

Please open the repository, read that file first, and then contribute.

That file explains:

• why this guide exists
• how we want to build it
• how you can add your ideas
• why even a small contribution is enough

Do not wait until you feel "good enough" to help.

If you have struggled with Codeforces problems, you already have something worth sharing.

Why This Exists

Codeforces has thousands of blogs on:

• Dynamic Programming
• Graphs
• Binary Search
• Number Theory
• Topic-wise problem lists
• Editorials

Those blogs are useful.

But most beginners still get stuck on the same thing:

They do not know how to think when the problem is unknown.

They can read a solution after it is written.

They can implement an algorithm after it is named.

They can copy a pattern after they have seen it 20 times.

What they cannot do is sit in front of a new problem and ask the right questions.

That is the real gap.

Not "I don't know enough algorithms."

The real gap is:

"I don't know how to start thinking."

This project exists to collect that missing part.

Not solutions.

Not codes.

Not rare tricks.

Ways of thinking.

The Idea Is Simple

One person cannot write the best beginner guide.

One person's mind is limited.

One person's rating is limited.

One person's experience is limited.

But the Codeforces community is not limited.

Somewhere in this community:

• a Pupil knows the exact confusion a Newbie feels
• a Specialist remembers the first observation that changed everything
• an Expert knows the questions they now ask before coding
• a Candidate Master knows how they recover when they are completely stuck
• a Master knows which beginner mistakes still appear in contests

If those ideas stay inside people's heads, beginners will keep suffering the same way.

If those ideas are written down in one place, beginners can learn them before wasting months.

That is the whole project.

Together, we can make a guide where common ideas stop feeling like surprises.

What We Are Building

We are building a community-driven problem solving guide for Codeforces beginners.

The goal is not:

• to claim one method solves every problem
• to replace editorials
• to teach every algorithm
• to make a fancy website
• to show off high rating

The goal is:

Collect the thinking habits that actually help people start, observe, simplify, and not panic.

So that when a beginner sees a problem, the useful ideas feel familiar, not magical.

Right now, many beginners feel this:

"The editorial observation was so simple. How was I supposed to think of that?"

That feeling is exactly what we want to reduce.

Not by giving spoilers.

By collecting the questions, checklists, habits, and ways of looking that make those observations less random.

Go To The Repository

A Community-Driven Problem Solving Guide For Codeforces Problems

Please do these 3 things:

1. Open the repository
2. Read the .txt invitation file
3. Contribute even one idea

That is enough.

You do not need to write a book.

You do not need perfect English.

You do not need a high rating.

You do not need a complete framework.

One useful thought is already a contribution.

Why A GitHub Guide, Not Just A Blog?

A Codeforces blog is usually frozen.

Someone writes it.

People comment.

Then it dies.

This project is meant to stay alive.

GitHub lets us:

• add ideas over time
• improve wording
• correct mistakes
• organize sections
• keep a public history
• let many people edit the same guide
• make Version 1, Version 2, Version 3... without losing the old work

The blog is only the announcement.

The real guide lives in the repository.

If you only read this blog and leave, nothing grows.

If you open the repository and add one idea, the guide becomes better for every beginner after you.

Who Can Contribute?

This is the most important part.

You do not need to be high rated.

Please read that again.

If you are:

• Newbie
• Pupil
• Specialist
• Expert
• Candidate Master
• Master
• Grandmaster
• or unrated

you can contribute.

In fact, lower-rated users are often more valuable here.

Why?

Because you still remember the pain.

You still remember:

• which part of the statement confused you
• which constraint you ignored
• which sample you didn't solve by hand
• which wrong approach you forced
• which editorial line made you say "oh..."
• which habit you wish someone told you on day 1

High-rated users sometimes forget how beginners actually think.

Beginners do not.

If Codeforces ever confused you, you are qualified.

What Should You Contribute?

Do not contribute random codes.

Do not dump full solutions of recent contests.

Do not write "learn DP" and leave.

Contribute thinking.

Here are examples of useful contributions:

1. Questions You Ask Before Coding

Write the questions you personally ask when a problem is new.

For example:

• What is actually being asked?
• Can I explain this in one sentence?
• What are the constraints forcing me to do?
• What happens on the smallest case?
• What is the brute force?
• What is the first observation?

Your own questions are useful. They do not need to be unique.

2. How You Break A Long Statement

Many beginners lose the problem while reading.

If you have a way to extract:

• input
• conditions
• output
• hidden rules

write it down.

3. How You Use Constraints

Constraints are not decoration.

If you have a simple way to guess:

• when (O(N^2)) is allowed
• when sorting is likely
• when binary search might appear
• when greedy is possible
• when the values are small enough for counting

share that.

4. How You Find Observations

This is the heart of Codeforces.

If you have a method for:

• making small examples
• solving samples by hand
• changing one variable and watching the answer
• looking for invariants
• simplifying the problem
• transforming the statement into something known

write it in simple words.

5. What You Do When You Are Completely Stuck

Everyone gets stuck.

Beginners need a recovery process, not "just think more."

If you have a sequence you follow when your mind is blank, contribute it.

6. Beginner Mistakes

These are gold.

Write mistakes like:

• coding before understanding
• ignoring edge cases
• forcing an algorithm because you just learned it
• not testing N = 1
• not re-reading the output format
• giving up too fast
• reading the editorial too fast and learning nothing

Then write how to avoid them.

7. Improvements To Existing Text

If something in the repository is:

• confusing
• too long
• too short
• badly worded
• incomplete
• wrong
• not beginner-friendly

fix it.

A better sentence is also a contribution.

8. Tiny Examples Of Thinking

Not full editorials.

Just a short example of a reusable thought, like:

"Before thinking of data structures, I write the brute force in words."

or

"If I cannot find the answer, I try to find what cannot be the answer."

Small lines like these can help more than a 2000-word essay.

What We Are NOT Building

Please keep the repository clean.

We are not collecting:

• full contest codes
• copied editorials
• "solve these 500 problems" lists with no thinking
• toxic "just git gud" advice
• flexing
• spoilers of ongoing contests
• extremely advanced rare techniques as the first thing beginners see

This guide is for beginners and struggling problem solvers.

Keep the language simple.

Keep the ideas reusable.

Keep the ego out.

Why This Can Actually Help

Most people try to improve like this:

Solve more problems. Repeat.

That works, but it is slow if your thinking process is random.

A beginner can solve 300 problems and still freeze on problem D, because they never wrote down the process that worked.

This guide is an attempt to make the process visible.

If 50 people each add one real habit, the guide becomes stronger than any single-author blog.

If 200 people add examples, questions, and corrections, then a new beginner can read something that feels like:

"These are the thoughts experienced people actually use. I can practice them too."

That is the dream.

Not magic.

Not talent worship.

A shared thinking notebook for Codeforces.

How To Contribute

Go here:

https://github.com/OmReddyEnduri/A-Community-Driven-Problem-Solving-Guide-For-Codeforces-Problems/tree/main

Then:

1. Read the invitation .txt file
2. See the current structure
3. Add your idea
4. Open a pull request, issue, or whatever contribution method is written there
5. Keep it beginner-friendly

If you are new to GitHub, still go and read the file.

Even if you cannot make a perfect pull request today, you can still participate, comment, suggest, and help shape the guide.

The first step is not "be a Git expert."

The first step is share the idea.

A Direct Request

If this blog made sense to you, do not only upvote and leave.

That helps me.

It does not help the next beginner.

The next beginner needs your idea in the repository.

So I am asking clearly:

Please contribute.

Contribute:

• 1 question
• 1 habit
• 1 mistake
• 1 paragraph
• 1 correction
• 1 better explanation

That is how a community guide is built.

Not by one perfect post.

By many imperfect, honest contributions.

For Beginners Reading This

If you are a beginner, you might think:

"I should only read. I have nothing to add."

That is false.

You can add the most important thing:

the questions you cannot answer yet.

Write:

• what confuses you in statements
• where you get stuck
• what you wish a guide explained
• what editorials never tell you
• what "observation" means to you right now

A guide for beginners should not be written only by people who forgot how it feels to be a beginner.

Your confusion is data.

Your confusion tells us what the guide must explain.

So yes, beginners should contribute too.

For Experienced Users Reading This

If you are experienced, you might think:

"This is obvious. Everyone already knows this."

No.

They don't.

What is obvious to you is invisible to them.

The questions you ask automatically are exactly the questions they never learned to ask.

If you can write those questions in simple language, you can save someone months.

You do not need to write a masterpiece.

Write the 5 things you wish you knew at 800-1200 rating.

That is enough to matter.

The Standard We Should Aim For

When someone opens the repository, they should feel:

"I can use this before my next practice session."

Not:

"This is a random dump of advice."

So please try to make contributions:

• short
• clear
• practical
• honest
• reusable
• beginner-readable

If you write an idea, ask yourself:

Would this have helped me on a real Codeforces problem?

If yes, add it.

This Guide Should Grow In Public

This starts small.

That is okay.

Every useful repository starts ugly.

The first version does not need to be complete.

The first version only needs to exist so other people can improve it.

If you see something missing, do not say "this is incomplete" and leave.

Add the missing part.

That is the point.

The comments and contributions are the product.

Final Call

I will say it one last time, because this is the whole blog:

We can keep learning alone.

Or we can put our thinking in one place so beginners stop treating every observation like a miracle.

If you care about the Codeforces community, this is an easy way to help.

Open the repository.

Read the invitation file.

Add one idea.

A Community-Driven Problem Solving Guide For Codeforces Problems

Let's build a guide by the community, for the community.

Let's make problem solving less mysterious.

Let's make sure the next beginner does not have to learn everything the hard way.

Contribute.