LeetCode
LeetCode is an online platform and community that provides a large collection of programming problems and an automated judge to help users practice coding and prepare for technical interviews. The site supports multiple programming languages, including Python, Java, C++, JavaScript, Go, and others. Problems are organized by topic (such as arrays, trees, dynamic programming, and graph theory), difficulty (Easy, Medium, Hard), and often by company-specific question sets.
LeetCode features an online editor and a judging engine that compiles and runs user submissions against test
LeetCode Premium is a paid tier that unlocks additional problems, curated study plans, and company-specific question
Impact and community: LeetCode is widely used by software engineers to prepare for interviews at large tech