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Course Schedule: detect cycle with topological sort (Kahn vs DFS)?

Q: Course Schedule: detect cycle with topological sort (Kahn vs DFS)?

**Core concept.** Course Schedule: detect cycle with topological sort (Kahn vs DFS)? is a classic interview signal. Input n steps Optimal O(n log n) Result Verified How it works — use optimal structure, maintain invariants, handle empty/single/duplicate. Brute O(n²) vs optimal O(n) or O(n log n). | | Brute | Optimal | |---

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Core concept. Course Schedule: detect cycle with topological sort (Kahn vs DFS)? is a classic interview signal.

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