A topological sort The basic steps of the algorithm are as follows: 1. Select a vertex of 0 from the diagram and output the vertex; 2. Remove the vertex and its associated arc from the diagram, and adjust the entry of the arc head of the deleted arc (entry - 1); Repeat execution, until all the vertices are output, the topological sort is completed or the graph has no more than 0 at the vertex (which indicates that the original graph contains the loop).

zxj.CPP

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