How to get solution of LeetCode problems?

LeetCode offers several ways to access the solutions to its problems, allowing you to understand different approaches, optimize your code, and learn new techniques. Here are various ways to get solutions for LeetCode problems:

1. LeetCode Official Solutions (Premium Feature)

• LeetCode Premium provides official solutions to most problems. These solutions often include:
  • Multiple Approaches: A step-by-step guide to different ways of solving the problem (e.g., brute-force, optimized approaches).
  • Code in Multiple Languages: Solutions are provided in common programming languages like Python, Java, and C++.
  • Time and Space Complexity: Detailed analysis of the solution’s efficiency.

How to Access:

• Upgrade to LeetCode Premium: To access official solutions, you’ll need to subscribe to LeetCode Premium, which also includes other benefits like company-specific problem sets and mock interviews.

2. LeetCode Discuss Section (Free Access)

• The Discuss section for each problem is a community-driven platform where users share their solutions and insights.
• Popular Solutions: Many users post their solutions along with explanations and optimizations. Highly upvoted solutions are often the best approaches.
• Alternative Approaches: You can find different ways of solving the same problem, which helps you understand various problem-solving techniques.
• Debugging Help: If you encounter issues with your code, you can ask questions, and other community members might offer suggestions or corrections.

How to Access:

• Open any problem on LeetCode, and click on the Discuss tab at the top of the page.
• Browse through the threads, or search for specific solutions using keywords.

3. Solution Videos on YouTube

• Many LeetCode problems are solved and explained by coding YouTubers. Channels often feature walkthroughs with detailed explanations, code implementation, and optimization tips.
• Popular YouTubers include NeetCode, Kevin Naughton Jr., Clément Mihailescu, and others who specialize in coding interview prep and LeetCode problem-solving.

How to Access:

• Search for the problem name or number directly on YouTube (e.g., "LeetCode 121 Best Time to Buy and Sell Stock solution").
• Watch multiple videos if you want to see different approaches.

4. LeetCode Solutions Websites and Blogs

• There are various websites and blogs that offer curated LeetCode solutions with detailed explanations. Some of the most popular resources include:
  • NeetCode: A comprehensive list of LeetCode problems categorized by topics, with solutions provided.
  • GitHub Repositories: Many users share their entire LeetCode journey on GitHub, where you can find solutions to hundreds of problems.
  • LeetCode Solution Blogs: Websites like LeetCode Solution or LeetCode Patterns provide categorized solutions and problem-solving patterns.

How to Access:

• Search for the problem number and add "solution" in a search engine (e.g., "LeetCode 121 solution").
• Browse GitHub repositories or coding blogs for detailed explanations and solutions.

5. Reverse Engineer from Test Cases

• Another way to understand the solution is to reverse engineer the problem by reviewing the test cases.
• Break Down Test Cases: Run your own code against the given test cases and figure out where your solution might be failing.
• Analyze Edge Cases: If you struggle with certain cases, try debugging your code by printing intermediate results.

How to Access:

• Use the LeetCode playground to run test cases and debug your code directly.

6. Online Coding Communities (StackOverflow, Reddit, etc.)

• Online communities like StackOverflow, Reddit (r/leetcode), and Codeforces also provide solutions and discussions around LeetCode problems.
• Ask for Help: If you're stuck on a problem and can’t find a clear solution, you can ask questions on these platforms, and experienced coders often share their approaches.

How to Access:

• Join forums or subreddits related to coding and LeetCode, or search for specific problem solutions using search engines.

7. LeetCode Hints

• Some problems on LeetCode provide hints to help guide you toward the solution. Hints can suggest which data structures or algorithms to use, or provide tips on how to approach the problem.

How to Access:

• If available, hints are usually located on the problem page. You can also click a "Show Hint" button if it’s provided.

8. Coding Interview Prep Courses

• Platforms like DesignGurus.io, AlgoExpert, and Udemy offer comprehensive courses that focus on coding interview preparation, often covering LeetCode-style problems.
• Grokking the Coding Interview by DesignGurus.io is particularly popular for learning coding patterns.

How to Access:

• You can explore these courses and enroll in one that fits your learning style.
  • Grokking the Coding Interview: Patterns for Coding Questions
  • Grokking Data Structures & Algorithms for Coding Interviews

Conclusion

To get the solution to LeetCode problems:

• Use LeetCode Premium for official solutions and optimized approaches.
• Explore the LeetCode Discuss section for community-provided solutions and explanations.
• Watch YouTube tutorials for step-by-step coding explanations.
• Refer to GitHub repositories, blogs, and solution websites for detailed breakdowns of common LeetCode problems.
• Use hints, reverse engineering, and test cases to figure out solutions independently.

By using a combination of these resources, you'll not only find the solution to a specific problem but also develop a deeper understanding of algorithms and problem-solving techniques that will be valuable for interviews.