LeetCode

Last updated
LeetCode
LeetCode Logo black with text.svg
Type of site
 Private
Founded7 August 2015
Headquarters
Palo Alto, California
,
US
OwnerLeetcode LLC
Founder(s) Winston Tang
Key peopleHercy Chang (CEO)
IndustrySoftware
Revenue US$8 million [1] (2024)
Employees264 (2025) [2]
URL

LeetCode is an online platform for coding interview preparation. The platform provides coding and algorithmic problems intended for users to practice coding. [3] LeetCode has gained popularity among job seekers in the software industry and coding enthusiasts as a resource for technical interviews and coding competitions. [3] [4] [5] [6] [7] As of 2025, the website has 26.3 million monthly visitors. [8]

Contents

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. [3] The performance of users' solutions is evaluated based on execution speed and memory usage, and is ranked against other submissions in the LeetCode database. [9]

Additionally, LeetCode provides its users with mock interviews and online assessments. LeetCode hosts weekly and biweekly contests, each having 4 problems. [6] [10] After participating in a contest for the first time, one gets assigned a ranking, which can be found in their profile. [11] LeetCode also provides its users with daily challenges, following UTC, with a lucky draw at the end of each month for those who stayed consistent for the month. [12]

LeetCode supports a wide range of programming languages, including Java, Python, JavaScript, and C. [13] In September 2024, LeetCode China supports Huawei's Cangjie programming language  [ zh ] for all problems. [14]

The platform features forums where users can engage in discussions related to problems, the interview process, and share their interview experiences. [6]

Types of problems

Every question on LeetCode has a particular category or tag. Some of the most common tags include arrays, strings, two pointers, stacks, binary search, sliding windows, linked lists, trees, tries, backtracking, heaps, priority queues, graphs, breadth-first search, depth-first search, dynamic programming, greedy algorithms, bit manipulation, database problems, and math. [15] [ better source needed ] As of April 2025, LeetCode offers 3525 questions across its three levels of difficulty; with 873 questions categorized as easy, 1829 as medium, and 823 as hard. [10] [ better source needed ]

History

LeetCode was founded in Silicon Valley in 2015 by Winston Tang. [16] [17] After moving to the US from Malaysia in 2005, Tang founded the company, citing his own experiences working at Amazon and Google as inspiration. [18] [17]

LeetCode expanded its operations to China in 2018, providing Chinese problems, solutions and forums on its Chinese website Likou (Chinese :力扣; pinyin :Lìkòu). [19] In 2021, LeetCode secured its first round of funding, receiving a $10 million investment from Lightspeed China Partners. [19]

See also

References

  1. ↑ LeetCode: Contact Details, Revenue, Funding, Employees and Company Profile Silicon Valley Journal
  2. ↑ LeetCode Employee Directory, Headcount & Staff LeadIQ
  3. 1 2 3 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.
  4. ↑ Ansari, Tasmia (2022-11-17). "The Ultimate Guide to Cracking Data Science Interviews". Analytics India Magazine. Retrieved 2023-06-10.
  5. ↑ Kolakowski, Nick (2022-12-08). "Which Programming Languages Are Growing?". Dice Insights. Retrieved 2023-06-10.
  6. 1 2 3 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.
  7. ↑ 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.
  8. ↑ leetcode.com Traffic analytics, ranking & audience (May 2025) Similarweb
  9. ↑ 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.
  10. 1 2 "LeetCode - The World's Leading Online Programming Learning Platform". leetcode.com. Retrieved 2023-10-10.
  11. ↑ "Contest". LeetCode. Retrieved 2023-10-10.
  12. ↑ "What is Daily LeetCoding Challenge?". leetcode.com. Retrieved 2023-12-09.
  13. ↑ 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)
  14. ↑ 编程刷题平台 LeetCode 力扣所有题目均已支持华为仓颉语言 [All problems on the programming practice platform LeetCode are now supported in Huawei's Cangjie language]. Sohu . Retrieved 2024-12-03.
  15. ↑ "NeetCode.io". neetcode.io. Retrieved 2023-10-10.
  16. ↑ "Secretary of State". bizfileonline.sos.ca.gov. Retrieved 2024-03-21.
  17. 1 2 Curry, Rachel (2024-06-24). "AI is shaping the fate of software engineers, but there is a new way to succeed". CNBC. Retrieved 2024-06-26.
  18. ↑ Tang, Winston. "AI cannot replace software engineers—take it from someone who fought to become one and now helps others pursue the career". Fortune. Retrieved 2024-07-31.
  19. 1 2 Shumin, Liao. "IT Job Interview Prepper LeetCode Pockets USD10 Million From Lightspeed China". www.yicaiglobal.com. Retrieved 2023-08-16.
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