Wikipedia

LeetCode

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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.[1] LeetCode has gained popularity among job seekers in the software industry and coding enthusiasts as a resource for technical interviews and coding competitions.[1][2][3][4][5] As of 2025, the website has 26.3 million monthly visitors.[6]

LeetCode
Type of site
Private
Founded7 August 2015
Headquarters
Palo Alto, California
,
US
IndustrySoftware
URL

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 execution speed and memory usage, and is ranked against other submissions in the LeetCode database.[7]

Additionally, LeetCode provides its users with mock interviews and online assessments. LeetCode hosts weekly and biweekly contests, each having 4 problems.[4][8] After participating in a contest for the first time, one gets assigned a ranking, which can be found in their profile.[9] 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.[10]

The platform features forums where users can engage in discussions related to problems, the interview process, and share their interview experiences.[4]

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. 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.[8][better source needed]

History

LeetCode expanded its operations to China in 2018, providing Chinese problems, solutions and forums on its Chinese website Likou (Chinese: 力扣; pinyin: Lìkòu).[11] In 2021, LeetCode secured its first round of funding, receiving a $10 million investment from Lightspeed China Partners.[11]

See also

References

  1. ^ 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.
  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. ^ 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.
  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. ^ leetcode.com Traffic analytics, ranking & audience (May 2025) Similarweb
  7. ^ 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.
  8. ^ a b "LeetCode - The World's Leading Online Programming Learning Platform". leetcode.com. Retrieved 2023-10-10.
  9. ^ "Contest". LeetCode. Retrieved 2023-10-10.
  10. ^ "What is Daily LeetCoding Challenge?". leetcode.com. Retrieved 2023-12-09.
  11. ^ 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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