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Course Schedule
Course Schedule tests whether you can keep a best-so-far structure honest as you go. Interviewers love it because it reveals your priority-based reasoning and your edge-case discipline. Interviewers watch whether you keep your heap in sync as inputs evolve.
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Graph Interview Questions
BFS explores by layers using a queue; DFS explores deeply using a stack or recursion -- the same traversal with a different container. Choose BFS for shortest-path in unweighted graphs and "minimum steps," DFS for counting components, islands, and tree recursion.
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Graph Interview Questions gives you a useful next rep while you are still on your phone.