Google and LinkedIn ask this frequently. It tests topological sorting and cycle detection, which are core graph algorithms. Graph questions appear in of Google onsite interviews for L4+ positions. This problem is a gateway to understanding dependency resolution, build systems, and task scheduling. Course Schedule II (return the order) is a common follow-up. If you can detect cycles, returning the topological order is straightforward.
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$ curl repovive.com/roadmaps/maang-interview-prep/graphs/course-schedule-why-this-problem
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