Grokking the Coding Interview: Patterns for Coding Questions
DesignGurus.io
Pattern-based approach to DSA that reduces 200+ LeetCode problems to 16 core patterns. The most efficient path to interview-ready coding skills.
Pros
- + Reduces the problem space to 16 patterns, massively more efficient than grinding 300 problems
- + Each pattern is taught before problems, so you build mental models not muscle memory
- + Well-sequenced difficulty curve within each pattern
- + Language-agnostic with solutions in Python, Java, JavaScript, and C++
- + Significantly faster to complete than blind problem grinding
Cons
- – Total problem count (160) is lower than LeetCode Premium
- – Less useful for company-specific question sets
Verdict
The most time-efficient DSA prep available. If you have 6 weeks, this course will get you further than grinding LeetCode problems without a framework. The pattern recognition skill it builds transfers to unseen problems, which is what FAANG interviews actually test.
The Core Insight
Most engineers fail coding interviews not because they can't code, but because they freeze when they see an unfamiliar problem. The solution isn't to memorize more problems. It's to recognize which pattern applies.
Grokking the Coding Interview is built on this insight. Every problem is tagged to one of 16 patterns. You learn the pattern, then apply it across 8–15 problems that share the same underlying structure.
The 16 Patterns
- Sliding Window: substring, subarray, and window-based problems
- Two Pointers: pair finding, sorted array manipulation
- Fast & Slow Pointers: cycle detection, middle of linked list
- Merge Intervals: overlapping ranges, meeting rooms
- Cyclic Sort: missing numbers, duplicates in range problems
- In-place Reversal: linked list manipulation
- Tree BFS: level-order traversal, zigzag patterns
- Tree DFS: path sum, root-to-leaf problems
- Two Heaps: median of stream, scheduling problems
- Subsets: permutations, combinations, power sets
- Modified Binary Search: rotated arrays, infinite sorted arrays
- Bitwise XOR: single number, complement problems
- Top K Elements: K largest, K closest, frequency problems
- K-way Merge: sorted lists merge, K pairs
- 0/1 Knapsack (DP): subset sum, target sum, bounded choices
- Topological Sort: course schedule, alien dictionary
How to Study Effectively
- Don't skip the pattern explanation. Read it fully before attempting any problem.
- Attempt each problem for 15 minutes before looking at the solution
- After a solution, identify what made you recognize the pattern. Write it down.
- Do a weekly pattern review. Pick any problem from a completed pattern and re-solve from scratch.
How It Compares to LeetCode
LeetCode is a problem bank. Grokking is a curriculum. They serve different purposes. Use Grokking to build the framework in weeks 1–5, then use LeetCode for company-specific problem sets in the final week.
Rating Breakdown
| Dimension | Score | Notes |
|---|---|---|
| Pattern Coverage | 5/5 | All major interview patterns included |
| Learning Efficiency | 5/5 | Best time-to-interview-ready ratio |
| Problem Quality | 5/5 | Carefully curated, no filler problems |
| Problem Volume | 4/5 | 160 problems vs LeetCode's 2000+ |
| Language Support | 5/5 | 4 languages covered |
Top Rated Course
Grokking the Coding Interview: Patterns for Coding Questions
Rated 4.8/5 by engineers who passed FAANG interviews. Pattern-based, visual, and actively maintained.
Start This Course →