Course Schedule
Given numCourses and prerequisites array where [a, b] means take b before a Return True if you can finish all courses (no cycle in dependency graph) Example: numCourses = 2, prerequisites = [[1,0]] => True Example: numCourses = 2, prerequisites = [[1,0],[0,1]] => False (cycle)
Prerequisites are edges. I peel off every course with nothing blocking it, and whatever refuses to peel is the cycle.
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Each locked part opens in the editor once the part before it passes.