With step-by-step explanations that even beginners can easily understand, coding tests that seemed vague become clear. Learn only what you need and apply it directly to practice!
2,439 learners
Level Basic
Course period Unlimited
Reviews from Early Learners
5.0
이한희
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
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
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!
Algorithm
Coding test
coding test
2025/02/16 TravelWallet accepted **Hyun
2025/07/31 Final acceptance from 3 companies Oh**
I don't know where to start with algorithms.
✔ Those who are new to algorithms and want to learn systematically from the basics
I don't understand the problem solutions.
✔ Those who want to properly understand the process and principles of problem-solving
Studying alone is too difficult
✔ Those who want a learning environment where you grow together, not alone
I heard that the coding test language is predetermined based on the stack you're applying for - like JavaScript for frontend and Java for backend?
That's correct. There are cases where the language is enforced.
I've taken coding tests at 38 companies and only encountered this at 2 places.
Almost all places you apply to will have virtually no language restrictions.
No matter what language you use to express it, interviewers also know that what's important is the thinking ability to solve problems.
You might be worried because it's not a language you've already learned.
However, I believe it's necessary to understand it as easily as possible with Python.
Algorithms are already difficult, but when complex syntax is mixed with difficult logic, the code becomes much harder to read.
When you first study, it's best to understand it as easily as possible, and then try expressing it in more complex ways later on.
It's also good to practice understanding through Python first, then expressing it in your own language.
If you understand the logic in Python, you can definitely express it in Java.
😨Ultimately, language is just a means of expression, and understanding the problem is what matters most.
And the easiest language to understand and solve problems with is Python.
[Updated July 20, 2025]
I've added additional code so you can solve problems in Java and Javascript as many students have requested!
I haven't added explanations in those languages, but it would be great if you could view them as a way to review by looking at code with the same logic in different languages!
There is a special benefit provided only to those who take the course.
There is a special curated collection of algorithm problems based on actual problems I encountered in 38 real coding tests.
You can think of this as a special problem set created for those who want to do additional problem practice beyond theory learning.
This problem set will be continuously updated, so you'll be able to prepare for algorithms in line with current trends!!
(This problem set is provided as a Notion link!)
Get it after verifying your course review in the algorithm community!
(The verification method is written in the very last lecture __)
That's not all
I'll even provide you with a developer job preparation guide (resume, portfolio, etc.)!
After completing the course, if you pass, please share your course review + job transition success story in the open chat room!
As a token of our appreciation, we will send you a coffee gift card
If you submit the Google form through this link
🎟 We'll give you a discount coupon 🎟
Pycharm IDE 3-month free trial provided!
To support your development studies, we've prepared special benefits through collaboration with JetBrains.
You can use PyCharm for free for 3 months with the promotion code below!
✅ Promotion Code: HYUNJOONPARKxJB
✅ Benefits: 3-month free access to a single JetBrains IDE (e.g., IntelliJ, PyCharm, WebStorm, etc.)
✅ Valid Until: May 13, 2026
✅ How to Use😀
1. Access the official JetBrains coupon registration page
2.Enter the code and select your desired IDE
3. Check the license issued to your email
⚠ Important Notice:
This code is only available for 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 use it unlimited times by creating new Google email accounts)
Among the lecture feedback, there was feedback saying "I wish there were more example problems."
In response to this feedback, I've added bonus problems throughout the course materials.
You can think of problems with the 🎆 icon as bonus problems without separate explanation videos
Added textbook PDF download link
3-5. Added explanation for further improvement methods for Stack - thanks to zz gg
1-5. Added explanation of the criteria for the first non-repeating character in finding the mode - thanks to Oh Subin
3-9. Added explanation of the condition that among songs with the same play count, songs with lower unique numbers should be included first - thanks to sonjs7554
4-2 Animation error in video corrected - thanks to 애롱
Fixed selection sort output error in 3-3 textbook - thanks to 유개발
Java, Javascript problem solution code added
Practical Data Structure Library Comparison Table - thanks to 브루브루
Week 4 Homework #1 boundary value logic correction and boundary value test addition - thanks to 한달안에 끝낸다
4-8 DP section BigInteger code and explanation added - thanks to xuv2
5-4 Input/output case correction - thanks to June
3-5 Input/Output case correction - thanks to giving0414
Who is this course right for?
Someone who is just starting to prepare for coding tests
For those who feel overwhelmed by the vast amount of algorithm study material
For those who need problem-solving skills that can be applied immediately in real situations
Beginners who need explanation-focused teaching and step-by-step approach
For 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
13,660
Learners
1,412
Reviews
267
Answers
4.9
Rating
16
Courses
🚀 Ex-Toss, POSTECH Alumni | Backend 8 years
🎥 YouTuber with 20k subscribers | Development content creator
📚 Inflearn Instructor | 8,000+ cumulative students
👥 Running a developer career community (8,000+ members)
🧩 Contributor to various open source projects (Gradle, Spring AI, etc.)
📝 Passed 38 resume screenings & 100+ resume coaching sessions on Kmong (5.0 rating)
Flipping the way you code, DingcoDingco. Delivering knowledge that is easy and deductively understood.
Đảo ngược lập trình, Dingco Dingco. Truyền tải kiến thức một cách dễ hiểu và có tính suy luận.
All
56 lectures ∙ (15hr 33min)
17. 2-3. Class
10:06
All
380 reviews
5.0
380 reviews
Reviews 29
∙
Average Rating 4.7
5
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.
Reviews 1
∙
Average Rating 5.0
Edited
5
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.
Reviews 1
∙
Average Rating 5.0
5
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!
Reviews 24
∙
Average Rating 5.0
5
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)
ㅋㅋnim!! Thank you so much for the detailed course review!! 😭😭😭😭 I really hope it was helpful!! Keep up the good work!!
Reviews 2
∙
Average Rating 5.0
5
I got a job without majoring in it, but I wasn't very prepared for algorithms, so I'm taking this course to supplement it. It's really easy to understand with the abundant materials and explanations~!! I was worried because I didn't use Python in my work, but fortunately, it's an easy-to-understand language ㅎㅎ
bhn1997, I'm so glad you understood it well!! You'll definitely feel the advantages of Python as you code!! I really hope you can break the code through this lecture ㅎㅎ
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