LeetCode

LeetCode is an online platform for coding interview preparation. The service provides coding and algorithmic problems intended for users to practice coding.[1] LeetCode has gained popularity among job seekers and coding enthusiasts as a resource for technical interviews and coding competitions.[2][3][1][4][5]

LeetCode
TypePrivate
IndustrySoftware
Founded13 February 2010 Edit this on Wikidata
Websiteleetcode.com

Features

LeetCode offers both free and premium access options. While free users have access to a limited number of questions, premium users gain access to additional questions previously used in interviews at large tech companies.[1] The performance of users' solutions is evaluated based on response speed and solution efficiency, and is ranked against other submissions in the LeetCode database.[6]

Additionally, LeetCode provides its users with mock interviews and online assessments. LeetCode hosts weekly competitions and biweekly competitions, and its users compete against each other.[7] By participating, you can win LeetCode coins which can be exchanged for a LeetCode T-shirt, a premium membership and more.[4] LeetCode hosts weekly and biweekly contests, each having 4 problems. After you participate in a contest for the first time, you get assigned a ranking, which can be found in the profile.[8]

LeetCode supports multiple programming languages, including Java, Python, JavaScript, and C.[9] The platform features forums where users can engage in discussions related to challenging problems, the interview process, and share their interview experiences.[4]

Types of Problems

LeetCode is an interview preparation website for technical interviews. LeetCode will develop your intuition for the similar problems companies will ask during an interview.[10] Currently, there are eighteen different categories that a LeetCode question can be from. In no particular order, these are: Arrays, Two Pointers, Stack, Binary Search, Sliding Window, Linked List, Trees, Tries, Backtracking, Heaps/Priority Queues, Graphs, Dynamic Programming, Intervals, Greedy Algorithms, Bit Manipulation, and Math/Geometry.[11] Each problem category contains questions at three levels of difficulty; there are 736 easy questions, 1521 medium questions, and 634 hard questions available on LeetCode.[12] A premium membership allows a user to access company-specific questions: Groups of questions categorized by a specific company.[1]

Interview

The technical coding interview, however, is not the only part of the software engineering interview: Interviewers can also ask questions on system design.[13] System design is "defined as a process of creating an architecture for different components, interfaces, and modules of the system and providing corresponding data helpful in implementing such elements in systems." LeetCode offers system design preparation as part of its premium plan.[14]

History

LeetCode was founded in Silicon Valley in 2015.

LeetCode expanded its operations to China in 2018.[15] In 2021, LeetCode secured its first round of funding, receiving a $10 million investment from Lightspeed China Partners.[15]

See also

References
  1. Singer, Natasha (2023-04-05). "For Lower-Income Students, Big Tech Internships Can Be Hard to Get". The New York Times. Retrieved 2023-08-09. To gear up for the assessments, many students practice their skills on LeetCode, a free test prep site that offers coding and algorithmic problems, along with detailed solutions. The site also offers premium services. For $35 a month, it gives members access to specific problems that companies like Amazon, Google and Microsoft previously used — and some continue to use — to assess applicants. To keep the questions up-to-date, the test prep service said, it regularly surveys members applying for tech positions.
  2. Ansari, Tasmia (2022-11-17). "The Ultimate Guide to Cracking Data Science Interviews". Analytics India Magazine. Retrieved 2023-06-10.
  3. Kolakowski, Nick (2022-12-08). "Which Programming Languages Are Growing?". Dice Insights. Retrieved 2023-06-10.
  4. Sonmez, John; Butow, Eric (2019-09-11). Programming Interviews For Dummies. John Wiley & Sons. ISBN 978-1-119-56506-2. LeetCode is also a popular site for programmers who want to get up to speed.
  5. Harper, Jocelyn (2023), Harper, Jocelyn (ed.), "Interview Insight: How to Get the Job", A Software Engineer’s Guide to Seniority: A Guide to Technical Leadership, Berkeley, CA: Apress, pp. 19–28, doi:10.1007/978-1-4842-8783-5_4, ISBN 978-1-4842-8783-5, retrieved 2023-08-11, LeetCode is a platform that specializes in algorithm questions ranked from "Easy" to "Hard" based on the complexity of the subject and solution. They also have a forum where people share what interview questions they encountered in phone screens and on-site interviews to share with the larger public and to help software engineers prepare. I have been fortunate that the only time that I encountered a LeetCode problem during a screening process was for Amazon. ... On this last interviewing journey, I found myself enjoying practicing algorithm coding questions because I found alternative resources to LeetCode.
  6. Xing, Jessica. "Here's what job seekers need to know about LeetCode, the coding-skills platform millions of developers use to ace the notoriously difficult technical interviews at firms such as Apple, Amazon, and Google". Business Insider. Retrieved 2023-06-21.
  7. "LeetCode - The World's Leading Online Programming Learning Platform". leetcode.com. Retrieved 2023-10-10.
  8. "Contest". LeetCode. Retrieved 2023-10-10.
  9. Nguyen, Nhan; Nadi, Sarah (2022-10-17). "An empirical evaluation of GitHub copilot's code suggestions". Proceedings of the 19th International Conference on Mining Software Repositories. MSR '22. New York, NY, USA: Association for Computing Machinery. pp. 1–5. doi:10.1145/3524842.3528470. ISBN 978-1-4503-9303-4. LeetCode questions come with test cases in various programming languages, ... (Python, Java, JavaScript, and C)
  10. Kolakowski, Nick (2022-12-08). "Which Programming Languages Are Growing?". Dice Insights. Retrieved 2023-10-10.
  11. "NeetCode.io". neetcode.io. Retrieved 2023-10-10.
  12. "LeetCode - The World's Leading Online Programming Learning Platform". leetcode.com. Retrieved 2023-10-10.
  13. Harper, Jocelyn (2023), Harper, Jocelyn (ed.), "Interview Insight: How to Get the Job", A Software Engineer’s Guide to Seniority: A Guide to Technical Leadership, Berkeley, CA: Apress, pp. 19–28, doi:10.1007/978-1-4842-8783-5_4, ISBN 978-1-4842-8783-5, retrieved 2023-10-10
  14. "Explore - LeetCode". leetcode.com. Retrieved 2023-10-10.
  15. Shumin, Liao. "IT Job Interview Prepper LeetCode Pockets USD10 Million From Lightspeed China". www.yicaiglobal.com. Retrieved 2023-08-16.
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