After Solving LeetCode Questions, I Forget Them

As many of us dive into the world of competitive programming and algorithmic challenges, we often encounter a familiar dilemma: after diligently solving a LeetCode problem, the solutions seem to fade from memory within weeks. Despite the time and effort invested, we find ourselves unable to recall how to approach similar problems unless we have access to hints or external tips. This raises a crucial question: how can we retain the knowledge gained from solving these questions?

The Challenge of Retention

When we solve a problem for the first time, we often experience a rush of satisfaction. However, without consistent practice or reinforcement, the intricacies of that solution can slip away. This phenomenon is not uncommon; it’s tied to cognitive processes related to memory retention. Just as we might forget a new language or a musical piece without regular practice, algorithmic solutions require ongoing engagement to become ingrained.

Deep Understanding Over Memorization

One of the most constructive pieces of advice comes from fellow programmers: “Try understanding the concepts deep down.” This sentiment encapsulates the essence of mastering algorithmic challenges. Here are several strategies to foster a deeper understanding and improve retention:

1. Conceptual Mastery

Instead of merely solving a problem, take the time to break down the underlying concepts. Ask yourself:

• What is the core idea behind the solution?
• How does it relate to other problems I’ve solved?
• Can I explain this solution to someone else?

By teaching the concept, you reinforce your understanding and highlight gaps in your knowledge.

2. Diverse Solutions

As suggested in the comments, “Create different solutions based on your understanding irrespective of the complexity.” This practice encourages creativity and adaptability. For instance, take a problem you’ve solved and try to implement it using a different algorithmic approach or data structure. This not only solidifies your understanding of the problem but also enhances your problem-solving toolkit.

3. Focus on Fundamentals

Building a strong foundation in basic concepts is essential. Make sure you are comfortable with:

• Time and space complexity analysis
• Common data structures (arrays, trees, graphs)
• Fundamental algorithms (sorting, searching, dynamic programming)

With a solid grasp of these fundamentals, you can approach complex problems with confidence.

Regular Review and Practice

To combat forgetfulness, establish a routine that includes regular review of previously solved problems. Consider the following methods:

• Spaced Repetition: Use tools like Anki to create flashcards for algorithms and their complexities.
• Weekly Problem Sets: Revisit a set of problems every week to strengthen your recall.
• Mock Interviews: Practice with peers or use platforms that simulate interview conditions to reinforce your memory under pressure.

Conclusion

The journey of mastering algorithms is ongoing and requires both dedication and strategy. By focusing on understanding concepts, exploring diverse solutions, and reinforcing your foundational knowledge, you can enhance your retention of algorithmic techniques. Remember, the goal is not just to solve problems but to internalize the processes that lead to those solutions.

Let’s open the floor for discussion! What strategies do you find effective in retaining knowledge from LeetCode or other coding platforms? Share your thoughts and experiences in the comments below!