代码的功能：用C语言仿真有向图的拓扑排序，代码中带有详细的注解，十分有利于阅读。拓扑排序算法是有向图的应用领域中的一种重要算法,阐述了AOV图的定义及拓扑排序算法思想。 -Functionality of the code: a directed graph topological sort in C language simulation code with detailed comments, very conducive to reading. The topological sort