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LeetCode Source: en.wikipedia.org/wiki/LeetCode

LeetCode, LLC
Company typePrivate
IndustrySoftware
FoundedAugust 7th, 2015
FounderWinston Tang
HeadquartersPalo Alto,
California
,
US
Key people
Hercy Chang (CEO)
RevenueUS$8 million[1] (2024)
Number of employees
264 (2025[2])
Website

LeetCode LLC, doing business as 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]

Features

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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

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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

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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

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References

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  1. ^ LeetCode: Contact Details, Revenue, Funding, Employees and Company Profile Silicon Valley Journal
  2. ^ LeetCode Employee Directory, Headcount & Staff LeadIQ
  3. ^ a b c 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. ^ a b c 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. ^ a b "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. ^ a b 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. ^ a b Shumin, Liao. "IT Job Interview Prepper LeetCode Pockets USD10 Million From Lightspeed China". www.yicaiglobal.com. Retrieved 2023-08-16.
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