The current test cases do not have a case where there is a course with no prerequisites. Therefore, all the test cases can be passed just by checking if there is a course without a prerequisite, without having to do DFS cycle detection or topological sort.
https://algo.monster/problems/course_schedule
The current test cases do not have a case where there is a course with no prerequisites. Therefore, all the test cases can be passed just by checking if there is a course without a prerequisite, without having to do DFS cycle detection or topological sort.
New test case:
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