DSA Mastery: A Learning Roadmap
0:00
0:00
🧠 DSA & more - Mastery Roadmap
1. 🧪 Understand the Problem
- Start by writing 3 to 5 small test cases
- Use RunCode (not Submit) to verify the expected outputs
- Confirm input format, constraints, edge cases
- Understand problem deeply before thinking of code
- Read the problem statement twice to catch subtle requirements +*
- Identify edge cases: empty inputs, single elements, maximum/minimum constraints +*
2. 🧠 Plan Before Coding
- Identify problem category: Tree / Graph / Greedy / Bit Manipulation / DP
- Think of multiple approaches and weigh trade-offs
- Consider if the problem combines topics (e.g., Bit + String)
- Choose optimal data structures early (HashMap vs Array, Stack vs Queue) +*
- Estimate time and space complexity -
- Write down your approach in 2-3 bullet points before coding +*
- Set a 30-minute timebox to simulate interview constraints -
3. 💻 Code & Validate
- Write clean, readable code (even if initial)
- Run small test cases using RunCode
- Dry-run your algorithm on paper for complex problems +*
- Test edge cases explicitly (empty, single element, max constraints) +*
- Run on max input case (e.g., array with 40K elements)
- Monitor RunCode time (e.g., 200ms = slow)
- If TLE or high runtime → do not submit yet
- When solution fails, systematically trace through failing test cases +*
4. 🔁 Revisit Later (if incomplete)
- Leave the problem — let it sit for a few days
- Trust that RunCode has saved your progress
- Revisit after 1-3 weeks with more understanding
- Attempt again with a better, optimized approach
- Submit only when runtime and memory are acceptable
- Implement spaced repetition: revisit solved problems after 1 week, 1 month, 3 months +*
5. 📚 Learn from Community
- Read the official solution
- Visit Discuss tab → Filter by
Most Votesand your language (e.g., Java) - Read top 5-10 posts and understand their insights -
- Focus on solutions that are both efficient AND readable, not just fastest +*
-
Open the Runtime Graph of submissions:
- Click left-most bar = fastest solutions
- Study their code and compare to yours
-
Save interesting patterns, one-liners, or tricks in a personal log -
- Document key insights and patterns in your learning log +*
6. 🧩 Build Patterns & Efficiency
- Maintain a notebook or log of ideas/mistakes -
- Keep a pattern library organized by problem type (Two Pointers, Sliding Window, etc.) +*
- Reapply patterns you learned in future problems
- Try to write faster and shorter code each time
- Review older submissions to observe your improvement
- Keep repeating this cycle until intuition builds
- Track your success rate and average time-to-solve by topic +*
- Hold weekly review sessions to consolidate learned patterns +*
7. 📈 Smart Practice Strategy
- Focus first on:
- Easy + Array
- Easy + String
- Easy + Math
- Follow progression: Easy → Medium → Hard within each topic before switching +*
-
Filter problems by topic + high acceptance rate
-
Choose problems with 999+ Discuss posts
- These are well-tried and often better explained
-
Avoid new problems with misleading high acceptance (may be tricky or buggy) -
- Start each practice session by reviewing 1-2 previously solved problems +*
- Always study runtime/memory graphs and try to learn from the top submissions
8. 🧠 When Problems Get Too Hard
-
There will be a point where solving becomes hard — everyone hits a limit
- For some it's at 100, for others 500 or 2000+
- At this stage, the goal is to learn by reading solutions
- Understand the solution deeply, then implement it from scratch without looking
- That way, you retain the learning and build intuition
-
Don't try to rediscover advanced topics like DP from scratch
- Instead, save time by studying existing patterns and applying them
9. 🧠 Interview Prep Add-ons
- Join peer-to-peer code reviews weekly -
- Practice explaining your solution out loud while coding +*
- Schedule mock interviews (Pramp, Interviewing.io, etc.)
- Do weekly timed problem-solving sessions (3-4 problems in 90 minutes) +*
- Study system design basics (for later stages) -
- Practice whiteboard coding without IDE assistance +*
- Prepare 1-2 behavioral stories each week (STAR format) -
🎯 Outcome
- Faster problem-solving with confidence
- Sharper understanding of patterns and optimization
- Better preparation for real interviews
- Consistent performance under time pressure +*
- Strong pattern recognition across problem types +*