GraphsEvidence Contributing
Topological Sort
Order nodes of a DAG so every directed edge points from earlier to later, via DFS post-order or Kahn's algorithm.
Practice Problems: 3
Difficulty: 0 Easy·2 Medium·1 Hard
Algorithmic Intuition & Recognition
The Topological Sort technique is applied when tackling problems characterized by specific invariants in the problem state or constraints:
- Core Strategy: Order nodes of a DAG so every directed edge points from earlier to later, via DFS post-order or Kahn's algorithm.
- When to use: Look for opportunities where repeated re-computation can be replaced by maintaining monotonic properties, state windows, or relational pointers.
- Interview Signal: Demonstrating this pattern shows mastery of Graphs foundations, reducing worst-case algorithmic complexity.