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Course Schedule II

intermediatelayer A11 · Topological patterns5 tests

There are numCourses courses labelled 0 to numCourses - 1. Each pair [a, b] in prerequisites means course b must be taken before course a.

Return any ordering of all the courses that respects every prerequisite. If no such ordering exists, return an empty array.

  • There are usually many valid answers — any one of them is accepted
  • A valid answer lists every course exactly once
  • With no prerequisites, every ordering is valid

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