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The idea is to use Kahn’s Algorithm, which applies BFS to generate a valid topological ordering. We first compute the in-degree of every vertex — representing how many incoming edges each vertex has. CS 106X, Lecture 25 Topological Sort reading: Programming Abstractions in C++, Chapter 18 The topological sorting for a directed acyclic graph is the linear ordering of vertices. For every edge U-V of a directed graph, the vertex u will come before vertex v in the ordering. Topological Sorting is also known as Kahn's algorithm and is a popular Sorting Algorithm.
