Explanation: There are a total of 2 courses to take. To take course 1 you should have finished course 0, and to take course 0 you should also have finished course 1.

Course Schedule II - There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites [i] = [ai, bi] indicates …

Course Schedule IV - There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites [i] = [ai, bi] indicates …

Course Schedule III - There are n different online courses numbered from 1 to n. You are given an array courses where courses [i] = [durationi, lastDayi] indicate that the ith course should be …

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