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云计算开发实例:Python3 拓扑排序
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简介...
对一个有向无环图(Directed Acyc云计lic Graph简称DAG)G进行拓扑排序算开,是将G中所有顶点排成一个线性序列,使得图中发实任意一对顶点u和v,若边(u,v)∈E(G)例:,则u在线性序列中出现在v之前。通常,这样的线性序Py列称为满足拓扑次序(Topologicalth Order)的序列,简称拓扑序列。简单的说,on由某个集合上的一个偏序得到该集合上的一个全3 序,这个操作称之为拓扑排序。
在图论中,由一拓扑个有向无环图的顶点组成的序列,当且仅当满足下列条件时排序,称为该图的一个拓扑排序(英语:Topol云计ogical sorting):
每个顶点出现且只出现一算开次;
若A在序列中排在B的前面,则在图中不存在从B到A发实的路径。
实例
执行以上代码输出结果为:
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