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LeetCode is an online platform for coding interview preparation. The platform provides coding and algorithmic problems intended for users to practice coding.cite-ref-nytimes2023-3-0[3] LeetCode has gained popularity among job seekers in the software industry and coding enthusiasts as a resource for technical interviews and coding competitions.cite-ref-nytimes2023-3-1[3]cite-ref-0-4-0[4]cite-ref-5[5]cite-ref-dummies-6-0[6]cite-ref-7[7] As of 2025, the website has 26.3 million monthly visitors.cite-ref-8[8]

• Features

• Types of problems

• History

• See also

• References

• External links

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.cite-ref-nytimes2023-3-2[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.cite-ref-xingbi-9-0[9]

Additionally, LeetCode provides its users with mock interviews and online assessments. LeetCode hosts weekly and biweekly contests, each having 4 problems.cite-ref-dummies-6-1[6]cite-ref-leetcodewebsite-10-0[10] After participating in a contest for the first time, one gets assigned a ranking, which can be found in their profile.cite-ref-11[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.cite-ref-12[12]

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

The platform features forums where users can engage in discussions related to problems, the interview process, and share their interview experiences.cite-ref-dummies-6-2[6]

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.cite-ref-15[15] 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.cite-ref-leetcodewebsite-10-1[10]

LeetCode was founded in Silicon Valley in 2015 by Winston Tang.cite-ref-16[16]cite-ref-1-17-0[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.cite-ref-18[18]cite-ref-1-17-1[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).cite-ref-yicai-19-0[19] In 2021, LeetCode secured its first round of funding, receiving a $10 million investment from Lightspeed China Partners.cite-ref-yicai-19-1[19]

• Competitive programming

cite-note-11. LeetCode: Contact Details, Revenue, Funding, Employees and Company Profile Silicon Valley Journal

cite-note-22. LeetCode Employee Directory, Headcount & Staff LeadIQ

cite-note-nytimes2023-33. ↑ citerefsinger2023Singer, 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.

cite-note-0-44. ↑ citerefansari2022Ansari, Tasmia (2022-11-17). "The Ultimate Guide to Cracking Data Science Interviews". Analytics India Magazine. Retrieved 2023-06-10.

cite-note-55. ↑ citerefkolakowski2022Kolakowski, Nick (2022-12-08). "Which Programming Languages Are Growing?". Dice Insights. Retrieved 2023-06-10.

cite-note-dummies-66. ↑ citerefsonmezbutow2019Sonmez, 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.

cite-note-77. ↑ citerefharper2023Harper, 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.

cite-note-88. ↑ leetcode.com Traffic analytics, ranking & audience (May 2025) Similarweb

cite-note-xingbi-99. ↑ citerefxingXing, 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.

cite-note-leetcodewebsite-1010. ↑ "LeetCode - The World's Leading Online Programming Learning Platform". leetcode.com. Retrieved 2023-10-10.

cite-note-1111. ↑ "Contest". LeetCode. Retrieved 2023-10-10.

cite-note-1212. ↑ "What is Daily LeetCoding Challenge?". leetcode.com. Retrieved 2023-12-09.

cite-note-1313. ↑ citerefnguyennadi2022Nguyen, 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)

cite-note-1414. ↑ 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.

cite-note-1515. ↑ "NeetCode.io". neetcode.io. Retrieved 2023-10-10.

cite-note-1616. ↑ "Secretary of State". bizfileonline.sos.ca.gov. Retrieved 2024-03-21.

cite-note-1-1717. ↑ citerefcurry2024Curry, 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.

cite-note-1818. ↑ citereftangTang, 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.

cite-note-yicai-1919. ↑ citerefshuminShumin, Liao. "IT Job Interview Prepper LeetCode Pockets USD10 Million From Lightspeed China". www.yicaiglobal.com. Retrieved 2023-08-16.

• Official website