BEST

38 Companies Passed: Essential Algorithms for 2026 Coding Tests

Name: 38 Companies Passed: Essential Algorithms for 2026 Coding Tests
Price: 165000 KRW
Rating: 5 (451 reviews)

Step-by-step explanations that even beginners can easily understand make coding tests that once seemed daunting clear and approachable. Learn only what you need and apply it to real problems right away!

(5.0) 451 reviews

2,882 learners

Level Basic

Course period Unlimited

dingcodingco

Python

Coding Test

Algorithm

data-structure

Python

Coding Test

Algorithm

data-structure

Reviews from Early Learners

5.0

이한희

73% enrolled

While I was busy with a project, I didn't have time to prepare for a coding test, so I was looking for a place to prepare quickly in a short period of time when I applied for a job, and I found out about DingCodingKo's lecture that I usually enjoy, and I purchased it and am taking the course. It is most important to do algorithms consistently, but I think it is a good lecture for those who need a systematic curriculum to study in a short period of time like me. The official curriculum period is a 5-week lecture, but the explanation is good, so you can quickly learn the theoretical content, and assuming you invest a little more time, I think it will be enough to study in 2 weeks if you have coded before. The theoretical study and simple practice are good, and it is also good to solve the problems that came out in the actual coding test in the last week's lecture. If I listen to all of this lecture and solve coding test problems on my own, I think my worries about coding tests in employment will be reduced!

5.0

자유곰

9% enrolled

Hello. I am a developer preparing for a job change. I have been learning algorithms from Baekjoon and Programmers for a long time, but I couldn't motivate myself to do it alone, so I looked for a lecture. Since I am currently using JAVA, I initially thought that Python was a language that I would learn later. However, after taking a sample lecture on other algorithms and being dissatisfied, I watched Dinkocodingko's sample lecture. The reason I decided to pay right away is that the tone of his voice suited me so well. I should say that it went straight into my ears? I was worried because I usually pay a lot of attention to the teacher's learning method, but it suited me so well! Since the tone of his voice is so good, I don't get sleepy, I can concentrate well, and it goes straight into my ears 😊😊 However, it's not just the tone of his voice that's good, but the way he teaches is not just about solving problems, but he really teaches about algorithms in detail, so I'm satisfied. I will definitely finish the course and try to change jobs 😊😊

5.0

가람

18% enrolled

It's been quite a while since I systematically studied algorithms. In practice, I often use libraries or frameworks, so I have fewer and fewer opportunities to directly contemplate and implement algorithms. This lecture allowed me to reorganize from the basics. In particular, I was impressed that it not only explained the concepts but also covered the way of thinking and approaches to solving problems in detail. Thanks to this, I was able to not only recall the concepts I had forgotten, but also regain the habit of thinking about how to write more efficient code. I think algorithms are not just for coding tests, but also greatly help to improve problem-solving skills. After building my basics through this lecture, I feel more confident in approaching new problems in the future. I highly recommend it to those who want to review from the basics!

What you will gain after the course

Algorithm
coding test
coding test

🎯 A coding test master class perfected through 38 real-world successes

I passed the coding tests for all of the companies below.

Naver, Kakao, LINE, Coupang, Baemin, Karrot, Zigbang, Yanolja, KakaoBank, MyRealTrip, Hyperconnect,

Kakao Mobility, Naver Webtoon, Works Mobile, Banksalad, Ohouse ...

Isn’t that old news? I changed jobs by taking coding tests as recently as last year. I’ve experienced the coding tests currently given by companies. So I know what to prepare and how far to go.

Studying for coding tests without a clear purpose? You no longer need to. I’ll teach you exactly what you need to know to get hired. Learn compactly and pass every coding test.

Features of this course

📌For complete beginners

It was created for beginners who have never learned algorithms before.
We start by explaining why this code is used and how to arrive at that idea, then go into detail about how the values change when the code is actually executed.
Still, you may not fully understand it, so at the end of the video, I’ve also included a visualization of how the algorithm works.

📌Just diving straight into problem solving?Absolutely not.

Rather than simply solving problems, I’ll methodically teach you the thought process for how to approach and solve them when you encounter a problem.
Algorithm problems aren’t designed to be solved only by math geniuses. Brilliant insights? Eureka moments? Absolutely not.
Each individual element that makes up a problem contains clues about how to solve it. I’ll show you how to pick up those clues.

📌 Community Management

Nevertheless, you may still have questions or encounter something you don't understand.
It can naturally happen with online courses.
So, we’ve created a community where you can ask and answer questions in real time.
Feel free to join us and ask any questions you have. Also, share algorithm solutions with various developers and try solving them together.

📌 60% theory, 40% practice

Starting with detailed theoretical explanations and ultimately working through actual problems given by companies, this curriculum covers it all.

😨Concern 1😨.
I heard coding test languages are predetermined these days—is that true?

Depending on the stack you’re applying for, I heard the language used for coding tests is predetermined—for example, JavaScript for frontend and Java for backend?

That's right. There are cases where a specific language is required.

I took coding tests at 38 places and encountered this at only two of them.

At almost all the places you apply to, there are generally no restrictions on the programming language.

No matter how you express it, interviewers also know that ultimately, the ability to think through and solve problems is what matters.

😨Concern Point 2😨.
But it’s not my primary language?

You may be worried because it isn’t a language you’ve already learned.

However, I think it is necessary to understand it as easily as possible with Python.

Algorithms are difficult enough already, and when complex syntax is mixed with complicated logic, the code becomes much harder to understand.

When you first study it, it’s best to understand it as easily as possible, and then try expressing it in a more difficult way later.

It’s also a good idea to first understand it through Python and then learn how to express it in your own language.

If you understand the logic using Python, you can definitely express it in Java.

😨Ultimately, a programming language is just a means of expression, and understanding the problem is the most important thing.

And the easiest language to understand and solve problems with is Python.

[Updated July 20, 2025]

We have added supplementary code so that you can also solve the problems in Java and JavaScript, as many students requested!
We have not added explanations in those languages, but we hope you will use this as a good opportunity to review by looking at the same logic implemented in another language!

🎁 EVENT 🎁

There is a special benefit available exclusively to those who take the course.

It contains carefully selected special algorithm problems based on the actual problems encountered while taking 38 real-world coding tests.

Please consider this a spe.cial. problem set created for those who want to study additional problems beyond the theory.
This problem set will be continuously updated, so you’ll be able to prepare for algorithm interviews in line with current trends!!

(This workbook will be provided as a link in the form of a Notion page!)

DALL·E 2024-11-06 23.37.48 - Design of a special algorithm workbook cover titled 'Essential Algorithm Problems from 38 Real Coding Tests.' The cover is in a deep blue background w

We will provide this problem set to those who write a course review!

Thank you.

Claim yours after verifying your course review in the algorithm community!

(I’ve explained how to verify it in the very last lecture __)

That's not all.

We’ll also provide a developer job preparation guide (resume, portfolio, and more)!

🎁 EVENT 2 🎁

Through KakaoTalk Plus Friend

🎟 We will send you a discount coupon 🎟
(15% off, cannot be combined with other discounts)

Click the link

🎁 EVENT 3 🎁

Pycharm IDE 3-month free access pass!

In support of your development studies, we have prepared a special benefit through our collaboration with JetBrains.
With the promotion code below, you can use PyCharm for free for three months!

✅ Promotion code: HYUNJOONPARKxJB
✅ Benefit: A 3-month free pass for one JetBrains IDE (e.g., IntelliJ, PyCharm, WebStorm, etc.)
✅ Valid through: December 31, 2026
✅ How to use: 😀

1. Go to the official JetBrains coupon registration page

2. Enter the code, then select your desired IDE

3. Check the license issued via email

⚠ Important notice:
This code is only available to new users who are using JetBrains for the first time.
(Only those who have never used a paid JetBrains license before can register)
(You can create new Google email accounts and do it indefinitely)

😆 Lastly, I’d like to emphasize just two things.

1. This course has undergone two thorough review processes, and all videos include subtitles.

You may think, "Why does that matter?", but many courses are uploaded as-is without being reviewed.

This course underwent two rounds of review to carefully check the subtitles and context, enhancing its overall quality.

2. The textbook has a total of 393 pages.

It was designed so that you can fully understand the content using only the textbook. We have organized and presented the textbook’s content systematically so that you can save your time and learn as efficiently as possible.

2024.11.30 Update

Among the course feedback, there was a comment saying, "It would be nice to have more example problems."

To reflect this, we added bonus problems throughout the lecture materials.

I think you can consider the problems with the 🎆 icon to be bonus problems without separate solution videos.

2024.12.15 Update

Added a link to download the textbook PDF

2025.1.13 Update

3-5. Added an explanation of how to further improve the stack — thanks to zz gg.

1-5. Added an explanation of the criterion for the first non-repeating character in Finding the Mode - thanks to Oh Subin.

3-9. Added an explanation of the condition that, among songs with the same number of plays, songs with lower unique numbers are included first - thanks to sonjs7554.

2025.5.18 Update

4-2 Fixed an animation error in the video - thanks to 애롱님

2025.7.18 Update

3-3 Corrected the selection sort output value error in the textbook - thanks to Yudev

2025.7.20 Update

Added Java and JavaScript problem-solving code

October 15, 2025 Update

Practical Data Structure Library Comparison Table - thanks to BruBru

2025.10.19 Update

Updated boundary value logic and added boundary value tests for Week 4 Homework 1 - thanks to 한달안에 끝낸다.

2025.12.7 Update

Added code and an explanation for BigInteger in the 4-8 DP section - thanks to xuv2‑nim

2025.12.13 Update

5-4 Input/output case correction - thanks to June‑nim

2025.12.24 Update

3-5 Input/output case fix - thanks to giving0414.

2026.02.05 Update

3-5 ➕ Isn’t there a way to improve it further? Input/output case revision - thanks to junnkyuu.

2026.03.08 Update

5-9 Added an explanation and course material on how to handle failing Programmers test cases - thanks to giving0414.

2026.03.11 Update

1-10 Description revised - thanks to Kim Ji-hyeop.

2026.04.25 Update

Added Q&A about two-pointer techniques in 2-10 - thanks to Myeongseok.

Recommended for
these people

Who is this course right for?

Those who are just starting to prepare for coding tests
Those who feel overwhelmed by the vast amount of algorithm study material
Those who need problem-solving methods that can be applied directly in real-world situations
Beginners who need explanation-focused teaching and step-by-step approach
Those who want to learn only the core algorithms that reflect the latest exam trends

Need to know before starting?

A very slight introduction to Python

Hello
This is dingcodingco

Inflearn Verified

Career Verified

20,636

Learners

2,040

Reviews

365

Answers

4.9

Rating

Courses

Park Hyun-jun · Dingcoding Co

POSTECH graduate · Backend development experience at Toss · Inflearn instructor

20,000+ cumulative Inflearn students · 2,000+ course reviews · 4.9 rating

Based on the Inflearn instructor profile, verified on 2026.10.03

Just nine months after starting to create courses, I was featured as one of Inflearn’s top-earning instructors. An Inflearn interview also features the story of a 60-year-old non-developer who completed a website.

We explain everything clearly, from why it is needed to how it is used on actual screens. Starting where beginners typically get stuck, we show you the process of building, clicking through, and fixing things yourself. In this challenge as well, leave the code and illustrations to Codex, and focus on judging the game's rules and results.

Inflearn interview: https://www.inflearn.com/pages/interviewdingco

Curriculum

All

56 lectures ∙ (15hr 33min)

Section 1. Pre-course Algorithm Test

2 lectures ∙ (17min)

Section 2. [Week 1] Time Complexity & Space Complexity

12 lectures ∙ (1hr 52min)

3. Class materials link
4. 1-1. What You Will Learn in Week 1
04:27
5. 1-2. Install the Required Programs
01:28
6. 1-3. Coding with PyCharm
02:54
7. 1-4. Getting Familiar with Algorithms (1)
07:52
8. 1-5. Getting Familiar with Algorithms (2)
26:00
9. 1-6. Determining Time Complexity
08:10
10. 1-7. Determining Space Complexity
08:17
11. 1-8. Asymptotic Notation
05:50
12. 1-9. Solve More Algorithms (1)
06:00
13. 1-10. Practice More Algorithms (2)
08:05
14. 1- 11. End of Week 1 & Homework Explanation
33:16

Section 3. [Week 2] Arrays and Linked Lists, Binary Search, Recursive Functions

10 lectures ∙ (2hr 22min)

15. 2-1. What We'll Learn in Week 2
03:03
16. 2-2. Arrays and Linked Lists
11:43
17. 2-3. Class
10:06
18. 2-4. Linked List Implementation - 1
16:48
19. 2-5. Linked List Implementation - 2
20:10
20. 2-6. Linked List Problems
07:59
21. 2-7. Binary Search
18:40
22. 2-8. Recursive Functions - 1
09:03
23. 2-9. Recursive Functions - 2
12:03
24. 2-10. End of Week 2 & Homework Explanation
32:37

Section 4. [Week 3] Sorting, Stack and Queue, Hash

9 lectures ∙ (3hr 40min)

Section 5. [Week 4] Trees and Heaps, BFS and DFS, and DP

9 lectures ∙ (3hr 2min)

Section 6. [Week 5] Tackling Actual Past Exam Problems from Kakao, Samsung, and LINE

14 lectures ∙ (4hr 18min)

Published: 11/12/2024

Last updated: 09/10/2026

Reviews

All

451 reviews

5.0

451 reviews

sethgots7214
Reviews 1
∙
Average Rating 5.0
03/01/2025
5
18% enrolled
It's been quite a while since I systematically studied algorithms. In practice, I often use libraries or frameworks, so I have fewer and fewer opportunities to directly contemplate and implement algorithms. This lecture allowed me to reorganize from the basics. In particular, I was impressed that it not only explained the concepts but also covered the way of thinking and approaches to solving problems in detail. Thanks to this, I was able to not only recall the concepts I had forgotten, but also regain the habit of thinking about how to write more efficient code. I think algorithms are not just for coding tests, but also greatly help to improve problem-solving skills. After building my basics through this lecture, I feel more confident in approaching new problems in the future. I highly recommend it to those who want to review from the basics!
yjym33
Reviews 29
∙
Average Rating 4.7
12/05/2024
5
13% enrolled
The instructor explained everything in detail, making it easy to understand even for those who are new to the subject. The visual aids at the end were also easy to follow, so it was very helpful. - What I would like to see: It would be great if there were explanations and problem-solving for complex algorithms that might come up on the CoTe, such as the Bellman-Ford, BFS, and Floyd-Warshall algorithms.
dgchangeworld2300
Reviews 2
∙
Average Rating 5.0
06/29/2025
5
7% enrolled
I'm not a developer and I want to change jobs, but I had absolutely no knowledge of coding tests, so I purchased this upon a friend's recommendation. It's still early, but the explanations use examples and analogies, and they're presented in an easy-to-understand way, so I seem to be grasping it quickly. I will definitely complete the course and nail my job change! Wish me luck!!
- dingcodingco
  Instructor
  08/10/2026
  It makes me feel truly proud to hear that the metaphorical explanations helped you understand, especially since you started with no prior coding knowledge. I'm rooting for you to achieve your career change goals by the time you complete the course!
lux
Reviews 24
∙
Average Rating 5.0
11/25/2024
5
7% enrolled
I bought this course because of the thumbnail, but the content was even better. I majored in it and have experience as a developer, but algorithm problems were always difficult. I am gradually gaining confidence while taking this course😊 I set a goal of completing the course in 5 weeks, so I hope I can finish it well!! - Structure: Each topic is well organized step by step, so it naturally connects from basic data structures to actual past exam questions. In particular, I liked the fact that various approaches were introduced in the process of solving each problem. - Teaching ability: The explanations of the Dingcoding instructor are amazing, so it is easy to understand even complex algorithms. Even using visualization data👍🏻👍🏻 - Practical application: It doesn't stop at simply explaining the theory, but also covers solving actual problems and analyzing efficiency, so I think it will be very helpful for actual coding tests! Recommended for: I highly recommend this course to those who are preparing for coding tests or want to systematically build up their algorithm skills. If you have some understanding of Python grammar, I think you will gain a lot from this course. Rating: ⭐⭐⭐⭐⭐ (5/5)
- dingcodingco
  Instructor
  11/25/2024
  ㅋㅋnim!! Thank you so much for the detailed course review!! 😭😭😭😭 I really hope it was helpful!! Keep up the good work!!
gisu11028193
Reviews 1
∙
Average Rating 5.0
11/27/2025
Edited
5
45% enrolled
I kept putting it off every day, but I've pulled myself together and started again. If you're encountering this for the first time, I think this will be the best course. When it comes to solidifying the basics, I doubt there's a better course at this price. What I hope for: It would be great if there were courses on more advanced algorithms after the basics.
- dingcodingco
  Instructor
  08/03/2026
  It was impressive to hear that you started again after putting it off. I am truly glad that it helped you build a solid foundation, and I will keep your request for advanced algorithms in mind.

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This course was created based on my personal experience passing the very first revised Information Processing Engineer practical exam, which had a pass rate of only 5.34%. The Information Processing Engineer practical exam can no longer be prepared for through simple memorization alone. In particular, the ability to read the execution flow of C, Java, Python, and SQL code to track results, as well as the ability to accurately distinguish short-answer concepts and write them as answers, has become crucial. This course is structured to help even beginners who are new to programming follow along step-by-step, covering everything from creating variable tables to tracking C, Java, Python, and SQL code, core practical terminology, and written exam subjects 1 through 5. Rather than being a video-centered course, this is a text-based course designed for fast reading and repeated review. It makes it easy to look up necessary parts again and focuses on practicing how to derive answers at the testing center by following the code and explanations directly. The 1st update covers the practical programming sections: C, Java, Python, and SQL. The 2nd update will organize core terms and concepts required for the short-answer practical questions and provide a "Stepper Simulator" to practice code tracking directly. The 3rd update will sequentially expand to cover written exam subjects 1 through 5. The Stepper Simulator is designed so that you don't just stop at reading explanations; you can understand how variable values change as the code executes line by line by following along yourself. If you have any questions while taking the course, please leave them in the Q&A. I will respond as quickly as possible to ensure your learning doesn't get stuck.

Beginner

Python, Java, C

Information Processing Engineer Practical + Written: Code Tracing Pass Roadmap for Beginners

potatosam

3. Coding Test + Algorithm Sparta Class

YAL

This course is designed to help entry-level professionals preparing for employment at game companies get ready for coding tests.

Beginner

C++, Coding Test

3. Coding Test + Algorithm Sparta Class

YAL

Machine Learning Python Practice for FPGA Implementation

EdgeChipLab

When you learn machine learning, you learn how to improve accuracy. But the moment you try to put that model onto an actual chip, questions no one has answered remain. How many multiplications does this model perform? How much does it need to remember, and for how long? Can the chip specifications you are targeting handle those requirements? Machine learning textbooks talk about accuracy, and semiconductor textbooks talk about circuits, but materials that bridge the gap between them are rare. I repeatedly encountered this gap while implementing RISC-V CPUs and NPUs on FPGAs. The model with the highest accuracy often turned out not to fit on the board. In this course, you will build six algorithms directly in Python, measuring the number of multiplications, comparisons, memory usage, and accuracy each time. Then you will convert those figures into the resources of an actual FPGA board. Saying that something requires a certain number of multiplications is not enough to gauge its size, but knowing that it uses a certain percentage of the board makes the decision clearer. After nine Labs, when the six models are brought together in a single table, an unexpected picture emerges. We spent nine lessons counting multiplications, but multiplications were not what held us back. After that, we reduce floating-point values to integers, manage bit widths, and even establish criteria for evaluating the circuit. You do not need an FPGA board. The course is conducted entirely in Python, and the board is used only as a reference for converting the measurements.

Intermediate

Python, Machine Learning(ML), Artificial Neural Network

Machine Learning Python Practice for FPGA Implementation

EdgeChipLab

Game Algorithms You Must Learn by Lee Deok-woo

ideugu

This is an online lecture that systematically organizes pathfinding and spatial partitioning algorithms used in game production.

Intermediate

Algorithm, Unity

Game Algorithms You Must Learn by Lee Deok-woo

ideugu

Learning Game Development and Algorithms with C++ with Windows API

bij

This is a game development & algorithm course that focuses on the algorithms and principles of 2D game development from the ground up using Windows API and C++.

Basic

winapi, C++, game-math

Learning Game Development and Algorithms with C++ with Windows API

bij

14 days with Claude Code

sorryhyun96

After using it for 14 days starting immediately upon release, here are the reasons why I recommend Claude Code (AI Coding) to everyone—from job seekers to industry professionals—as something they can apply right away.

Beginner

React, Python, Java

14 days with Claude Code

sorryhyun96

[Technologies Supporting Game Development in the AI Era] Hong Sabu's Diablo 1 PCG Dungeon Generation Algorithm

Rookiss

Learn the principles of Diablo 1-style PCG dungeon generation by implementing its structure in the console, with the theme 'Technology Supporting Game Development in the AI Era'. Expand this to 3D in Unity to complete a generation pipeline equipped with seed-based dungeon generation, mesh placement rules, and debug tooling. Through sample code and hands-on practice, connect to AI-assisted art production workflows, enabling you to create immediately applicable dungeon crawler prototypes.

Basic

C#, Unity, Algorithm

[Technologies Supporting Game Development in the AI Era] Hong Sabu's Diablo 1 PCG Dungeon Generation Algorithm

Rookiss

Computer Science (4): Data Structures - Data Storage, Algorithms, Object Orientation

onemoresipofcoffee

✅ Out of the entire series (1) ~ (7), (4) data structure, algorithm, object-oriented, programming language ✅ CS101 series lectures - From basic computer theory to the latest practical examples - Provides a wide range of basic knowledge

Beginner

Operating System, Algorithm

Computer Science (4): Data Structures - Data Storage, Algorithms, Object Orientation

onemoresipofcoffee

iOS App Monetization Start, Swift Grammar Master [Beginner, Intermediate, Advanced]

jangsanggu

When learning Swift, the iOS programming language, it can be confusing when multiple concepts appear all at once. That's why I created this course with the principle that "when understanding a new concept, only previously learned concepts should be used." So this course is meticulously designed with a sequential structure between concepts, where only one new concept appears at each stage, and no other unfamiliar concepts appear at all. One concept per minute, 180 concepts total. From the basics of variables and constants to understanding memory structure from a CS perspective, and even the latest syntax for asynchronous processing. In 3 hours, you'll learn 180 core concepts in the designed order.

Intermediate

iOS, Swift, oop

iOS App Monetization Start, Swift Grammar Master [Beginner, Intermediate, Advanced]

jangsanggu

Senior Data Analyst's SQL Coding Test Know-how Revealed [Monthly Datalian Seminar Replay | December 2023]

datarian

If you are worried about where to start and where to start studying because you need to take a SQL coding test to become a data analyst, then come to this seminar!

Beginner

SQL, Coding Test

Senior Data Analyst's SQL Coding Test Know-how Revealed [Monthly Datalian Seminar Replay | December 2023]

datarian

38 Companies Passed: Essential Algorithms for 2026 Coding Tests

5.0

What you will gain after the course

🎯 A coding test master class perfected through 38 real-world successes

2026 Latest Coding Test - 5-Week Project to Master Essential Algorithms🔥🔥🔥

A collection of real reviews from people who took the course and passed their coding tests.

✅ Here's what you'll learn.

Features of this course

Recommended for those who...

🥳🥳🥳 Real Student Reviews 🥳🥳🥳

😨Concern 1😨. I heard coding test languages are predetermined these days—is that true?

😨Concern Point 2😨. But it’s not my primary language?

🎁 EVENT 🎁

We will provide this problem set to those who write a course review!

Thank you.

🎁 EVENT 2 🎁

🎁 EVENT 3 🎁

😆 Lastly, I’d like to emphasize just two things.

1. This course has undergone two thorough review processes, and all videos include subtitles.

2. The textbook has a total of 393 pages.

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Recommended for these people

HelloThis is dingcodingco

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😨Concern 1😨.
I heard coding test languages are predetermined these days—is that true?

😨Concern Point 2😨.
But it’s not my primary language?

Recommended for
these people

Hello
This is dingcodingco