Advanced~2h
Topological Sort in Data Structures & AlgorithmsInterview Readiness Check
Dependency ordering — course prerequisites, build systems, task scheduling with Kahn's + DFS.
in-degreeKahn'scourse scheduleDAGdependency resolutionbuild order
Learning path
Try a sample question
Course schedule: you must take course A before course B, B before C. Given prerequisites as directed edges, can you finish all courses? Which algorithm determines this?
A.BFS level-order traversal of the course graph
B.DFS to find the longest path through courses
C.Topological sort — if a valid ordering exists (no cycles in the directed graph), you can complete all courses. A cycle means A requires B requires A — impossible.
D.Greedy: always take the course with the fewest prerequisites first
Sign up free to take the full check and see the answer with an explanation.
What this module tests
- Conceptual understanding of topological sort fundamentals
- Trade-offs and design decisions in real system scenarios
- in-degree and Kahn's — applied knowledge
- Interview-style reasoning and explanation quality
Free to start
Take the Topological Sort 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 Topological Sort check test?
- The check covers dependency ordering — course prerequisites, build systems, task scheduling with kahn's + dfs. Questions span beginner to advanced difficulty and test both conceptual understanding and practical trade-off reasoning.
- What keywords should I know for Topological Sort?
- Key concepts include: in-degree, Kahn's, course schedule, DAG, dependency resolution, build order. 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 Topological Sort?
- Most engineers spend around 2 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 Topological Sort?
- Topological Sort builds on Graph Algorithms. Complete those first for the best results.
- Is in-degree, Kahn's, course schedule covered?
- Yes. The Topological Sort module covers in-degree, Kahn's, course schedule among other key concepts. The check includes questions that reflect real data structures & algorithms interview patterns.