LeetCode 207: Course Schedule — Step-by-Step...

Medium — Graph | Topological Sort | BFS | Cycle Detection The Problem Determine if it's possible to finish all courses given a list of prerequisite pairs, where each pair [a,b] indicates course a requires course b to be completed first. Approach Use topological sorting with Kahn's algorithm to detect cycles in the course dependency graph. Build a graph and track in-degrees, then process courses with no prerequisites first, removing edges and checking if all courses can eventually be processed. T