The classic algorithm practice platform
Introduction
LeetCode (China) is the standard for algorithm practice: 3000+ problems, company-tagged questions, weekly contests and rich solution discussions.
Key Features
- 3000+ algorithm and SQL problems
- Company-tagged questions
- Weekly and biweekly contests
- Multilingual solution community
Pros
- High-quality problem set
Cons
- Premium problems and solutions paid
Pricing
Many free problems; premium unlocks full solutions.（See official site for current pricing）
FAQ
How many problems suffice?
200-300 well-understood classics beat raw quantity.
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