How to Learn DSA in 6 Months | Full Roadmap

Summary

In this insightful video, Harshit Trehan, a Software Engineer at Atlassian, shares his journey of learning Data Structures and Algorithms (DSA). He emphasizes the importance of having a structured approach, outlining a four-step process: choosing a programming language, understanding basic and advanced data structures, learning essential algorithms, and practicing coding questions. With a recommended preparation timeline of about six months, he encourages consistent practice to maintain skills. Trehan’s experience highlights that with the right resources and focus, mastering DSA can be achieved efficiently, ultimately preparing students for successful coding interviews.

Takeaways

• 😀 DSA is essential for technical interviews, similar to mastering key math concepts for exams.
• 🛤️ A structured learning path is vital for effectively mastering DSA.
• 💻 Choose a programming language like Java for its industry relevance and ease of use when starting DSA.
• 📚 Begin with basic data structures such as linked lists, stacks, queues, and hash maps before advancing to trees, graphs, and heaps.
• 🔍 Understanding key algorithms like searching, sorting, dynamic programming, and their time/space complexities is crucial for optimizing solutions.
• ⏳ With the right approach and resources, DSA can be learned in approximately six months.
• 🔄 Regular practice is necessary to retain DSA concepts and improve problem-solving skills.
• 📈 Focus on solving frequently asked coding questions, especially the top 150 questions on platforms like LeetCode.
• 💡 Utilize resources such as InterviewBit and Pep Coding for structured learning and practical problem-solving.
• 📝 Even after initial preparation, consistent engagement with DSA is important to keep skills sharp for interviews.

Q & A

What is the primary concern of Harshit Trehan regarding learning DSA?

Harshit Trehan expresses his initial uncertainty about how much time it would take to learn Data Structures and Algorithms (DSA), highlighting that he received vague answers from others.

How long did it take Harshit to prepare for DSA, and what did he learn from that experience?

It took Harshit almost one year to prepare for DSA. He learned that with the right path and resources, one can complete DSA preparation in much less time.

How does Harshit compare learning DSA to learning mathematics?

Harshit compares learning DSA to learning mathematics by stating that both subjects contain numerous concepts and can be overwhelming. However, focusing on specific goals allows for a more manageable learning process.

What are the four steps Harshit recommends for learning DSA from scratch?

The four steps are: 1) Choosing and familiarizing oneself with a programming language, 2) Understanding data structures, 3) Learning algorithms and time complexity, and 4) Practicing coding questions.

Why does Harshit recommend Java for learning DSA?

Harshit recommends Java because it is widely used in the industry, is not a low-level language like C++, and is comparatively easier to write.

What are the five main basic data structures Harshit mentions?

The five main basic data structures are Linked Lists, Stacks, Queues, Hash Maps, and he later mentions advanced data structures: Trees, Graphs, and Heaps.

What resources does Harshit suggest for learning data structures?

Harshit suggests using InterviewBit for problem-solving and PepCoding's YouTube channel for video explanations and demonstrations.

What six main algorithms does Harshit emphasize as essential for interviews?

The six essential algorithms are Searching and Sorting Algorithms, Divide and Conquer Algorithm, Greedy Algorithm, Recursive Algorithm, Dynamic Programming, and Backtracking Algorithm.

What is the total estimated time to learn DSA according to Harshit?

Harshit estimates that learning DSA from scratch can take around six months, broken down into several phases including programming language familiarization, understanding data structures, learning algorithms, and practicing coding questions.

What is Harshit's advice for maintaining DSA skills after completing the initial preparation?

Harshit advises that regular practice is crucial for retaining DSA concepts. He suggests solving one or two questions daily or participating in contests to keep skills sharp.