Course Schedule II
Given numCourses and prerequisites[i] = [a, b] (take b before a) Return order to take all courses, or [] if impossible Example: numCourses=2, prerequisites=[[1,0]] => [0,1]
Course Schedule II is a traversal problem: the hard part is modeling the state you visit. Interviewers love it because it reveals your traversal modeling and your edge-case discipline. Once your traversal structure is solid, you can reuse it across dozens of problems.
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