LeetCode LLC, doing business asLeetCode, 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
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]
The platform features forums where users can engage in discussions related to problems, the interview process, and share their interview experiences.[6]
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]
^ abcSinger, 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.
^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, ISBN978-1-4842-8783-5, 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.
^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. ISBN978-1-4503-9303-4. LeetCode questions come with test cases in various programming languages, ... (Python, Java, JavaScript, and C)
^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.
