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Course Schedule is a medium coding interview question covering graphs, topological sort, breadth-first search — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
There are numCourses courses labeled 0 to numCourses-1, and a list of prerequisite pairs [a, b] meaning course b must be taken before course a. Determine whether all courses can be finished. Example: 4 courses, prerequisites [[1,0],[2,0],[3,1],[3,2]] -> true.
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