Advanced~3h
2D Dynamic Programming in Data Structures & AlgorithmsInterview Readiness Check
Grid paths, string alignment, subsequences — LCS, edit distance, knapsack, unique paths.
gridLCSedit distanceunique pathsknapsacksubsequence
Learning path
Try a sample question
Count unique paths from top-left to bottom-right of an m×n grid, moving only right or down. Why is this a 2D DP problem?
A.Because the grid has two dimensions
B.Each cell (i,j) can only be reached from (i-1,j) or (i,j-1). The number of paths to (i,j) = paths to (i-1,j) + paths to (i,j-1). State depends on two indices.
C.You need to track both row and column separately
D.2D DP is required whenever the input is a matrix
Sign up free to take the full check and see the answer with an explanation.
What this module tests
- Conceptual understanding of 2d dynamic programming fundamentals
- Trade-offs and design decisions in real system scenarios
- grid and LCS — applied knowledge
- Interview-style reasoning and explanation quality
Free to start
Take the 2D Dynamic Programming check →
10 questions · Dimension scoring · AI coach feedback · Shareable result
Test your knowledge — free →No credit card · Takes 10–15 min
Frequently asked questions
- What does the 2D Dynamic Programming check test?
- The check covers grid paths, string alignment, subsequences — lcs, edit distance, knapsack, unique paths. Questions span beginner to advanced difficulty and test both conceptual understanding and practical trade-off reasoning.
- What keywords should I know for 2D Dynamic Programming?
- Key concepts include: grid, LCS, edit distance, unique paths, knapsack, subsequence. These frequently appear in data structures & algorithms interviews at product and infrastructure companies.
- How many questions are in the check?
- Each check has 10 questions — a mix of MCQ and short-answer. You get scored by dimension (e.g., scalability, consistency) so you know exactly where to focus.
- How long does it take to study 2D Dynamic Programming?
- Most engineers spend around 3 hours on this module. The check itself takes about 10–15 minutes. You can retake it up to 3 times per day.
- What prerequisite knowledge do I need before 2D Dynamic Programming?
- 2D Dynamic Programming builds on 1D Dynamic Programming. Complete those first for the best results.
- Is grid, LCS, edit distance covered?
- Yes. The 2D Dynamic Programming module covers grid, LCS, edit distance among other key concepts. The check includes questions that reflect real data structures & algorithms interview patterns.