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LeetCode supports multiple programming languages, including [[Java (programming language)|Java]], [[Python (programming language)|Python]], [[JavaScript]], and [[C (programming language)|C]].<ref>{{Cite book |last1=Nguyen |first1=Nhan |last2=Nadi |first2=Sarah |title=Proceedings of the 19th International Conference on Mining Software Repositories |chapter=An empirical evaluation of GitHub copilot's code suggestions |date=2022-10-17 |series=MSR '22 |___location=New York, NY, USA |publisher=Association for Computing Machinery |pages=1–5 |doi=10.1145/3524842.3528470 |isbn=978-1-4503-9303-4 |quote=LeetCode questions come with test cases in various programming languages, ... (Python, Java, JavaScript, and C)|doi-access=free }}</ref> The platform features forums where users can engage in discussions related to challenging problems, the interview process, and share their interview experiences.<ref name=dummies/>
== Types of Problems ==
Leetcode is an interview preparation website for technical interviews. Leetcode will develop your intuition for the similar problems companies will ask during an interview.<ref>{{Cite web |last=Kolakowski |first=Nick |date=2022-12-08 |title=Which Programming Languages Are Growing? |url=https://www.dice.com/career-advice/which-programming-languages-are-growing |access-date=2023-10-10 |website=Dice Insights |language=en}}</ref>
Leetcode was founded in Silicon Valley in 2015. In 2017, Leetcode amounted to 1million users.<ref>{{Cite web |title=LeetCode {{!}} LinkedIn |url=https://www.linkedin.com/company/leet-code |access-date=2023-10-10 |website=www.linkedin.com |language=en}}</ref>
Currently, there are eighteen different categories that a Leetcode question can be from. In no particular order, these are: Arrays, Two Pointers, Stack, Binary Search, Sliding Window, Linked List, Trees, Tries, Backtracking, Heaps/Priority Queues, Graphs, Dynamic Programming, Intervals, Greedy Algorithms, Bit Manipulation, and Math/Geometry.<ref>{{Cite web |title=NeetCode.io |url=https://neetcode.io/roadmap |access-date=2023-10-10 |website=neetcode.io}}</ref>
In each problem category, there are three levels that a problem could be: easy, medium, and hard. There are 736 easy questions, 1521 medium questions, and 634 hard questions available on Leetcode.<ref>{{Cite web |title=LeetCode - The World's Leading Online Programming Learning Platform |url=https://leetcode.com/ |access-date=2023-10-10 |website=leetcode.com}}</ref> Different companies propose different problems during interviews. The premium membership in Leetcode allows a user to access company-specific questions: Groups of questions categorized by a specific company.<ref>{{Cite web |title=LeetCode - The World's Leading Online Programming Learning Platform |url=https://leetcode.com/ |access-date=2023-10-10 |website=leetcode.com}}</ref>
Additionally, Leetcode provides its users with mock interviews and online assessments. Each week, Leetcode hosts weekly competitions, and its users compete against each other.<ref>{{Cite web |title=LeetCode - The World's Leading Online Programming Learning Platform |url=https://leetcode.com/ |access-date=2023-10-10 |website=leetcode.com}}</ref>
The technical coding interview, however, is not the only part of the software engineering interivew: Interviewers can also ask questions on system design.<ref>{{Citation |last=Harper |first=Jocelyn |title=Interview Insight: How to Get the Job |date=2023 |url=https://doi.org/10.1007/978-1-4842-8783-5_4 |work=A Software Engineer’s Guide to Seniority: A Guide to Technical Leadership |pages=19–28 |editor-last=Harper |editor-first=Jocelyn |access-date=2023-10-10 |place=Berkeley, CA |publisher=Apress |language=en |doi=10.1007/978-1-4842-8783-5_4 |isbn=978-1-4842-8783-5}}</ref> [[Systems design|System design]] is "''defined as a process of creating an architecture for different components, interfaces, and modules of the system and providing corresponding data helpful in implementing such elements in systems."'' Leetcode offers system design preparation as part of its premium plan.<ref>{{Cite web |title=Explore - LeetCode |url=https://leetcode.com/explore/learn/card/system-design/ |access-date=2023-10-10 |website=leetcode.com}}</ref> Leetcode can also prepare you for quant developer interviews.<ref>{{Cite web |title=Engineering To Quant Finance - How To Make The Transition {{!}} QuantStart |url=https://www.quantstart.com/articles/engineering-to-quant-finance-how-to-make-the-transition/ |access-date=2023-10-10 |website=www.quantstart.com}}</ref> Quant development engineers do a lot of low-level programming, so it is imperative that someone interviewing for this position practice Leetcode questions with C++.
== History ==
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