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CoursesTrees & GraphsTopological Sort

Boss: Course Schedule

The island's final test: can every course be finished? Read [a, b] as b BEFORE a — the arrow flows from prerequisite to dependent — then peel with Kahn's. Courses left unpeeled are the cycle's confession.

BossComplete codeDebugCode orderMultiple choiceTrace8 exercises, 10 min
AlgoFox Pro

Trees & Graphs is part of AlgoFox Pro

You can read the whole course outline here. The exercises are in the app, along with your streak, your mistake review, and the progress that carries across your devices.

Pro starts with a 3 day free trial. The app store decides who is eligible for an introductory offer, and a lapsed subscription does not get another one.

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Already subscribed in the app? Sign in with the same account and Pro works here too. Quick Play and Battle are free on the web, and so is the first course in every subject.