pinprerequisites:graph[p].append(c)indegree[c]+=1# 筛选出不需要预先课程的课queue=[iforiinrange(n)ifindegree[i]==0]path=[]# 上课顺序whilequeue:# queue 里的课程都是已满足
拓扑排序(Topological Sort) 假设一个应用场景:你用 C 编写了一个爬虫工具,其中有很多自定义的库:queue.c、queue.h、stack.c、stack.h、heap.c、heap.h等等,且这些文件没有其他自定义库的依赖;另外还有一些基于上述自定义库的库:bfs.c、bfs.h、dfs.c、dfs.h、dijkstra.c、dijkstra.h、tcpSocket.c、tcpSoc...
拓扑排序(Topological Sort)是针对有向无环图(DAG)的一种排序方式,使得在图中uv路径为从u到v的排序结果中,u始终出现在v前面。 比如说,学功课C需要先学其前置课程A或者B,那么若把功课ABC用图表示,然后进行拓扑排序,可以表示成为ABC或者BAC,总之C不能出现在A或者B的前面。由此可知,很多时候拓扑排序不止一个结果...
由于b已经被visit过了,现在从c出发,DFS-Visit到f上。 f不能visit自己,且e被visit过了,这里就断了。 之后c,d,e,f都被visit过了,所有就完成了。 DFS的时间复杂度如下(这里不做多余的解释): 二、边分类 Edge Classification可以解决两个问题:cycle detection和topological sort。 它有四种边: tree edge:即带有...
* Topologically sort some objects. * <p>There may not be any nulls among the objects, nor duplicates * (as per hash/equals), nor duplicates among the edge lists. * The edge map need not contain an entry for every object, only if it ...
Code for Topological SortLet's see the code for topological sorting using Depth First Search (DFS) algorithm:C C++ Java Python Open Compiler #include <stdio.h> #define MAX_VERTICES 6 int adj[MAX_VERTICES][MAX_VERTICES] = { {0, 1, 1, 0, 0, 0}, {0, 0, 0, 1, 1, 0}, {0...
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npm install layered-topological-sort Usage import{Sort,typeGraph}from"layered-topological-sort";constgraph:Graph={root:"A",edges:{"A":["B","C"],"B":["D"],"C":["E","F"],"D":["G"],"E":[],"F":[],}}constsortedLayers=Sort(graph);console.log(sortedLayers);// [["A"],...
102 - val structure: CodeTree[c.Tree] = compile(parallelized) 103 + 104 + val (nodes, yieldExpr) = Algorithm.compileNodes(sequential) 105 + val sorted = Algorithm.topSort(nodes) 106 + val parallelized = Algorithm.parallelizeNodes(sorted, yieldExpr) 107 + // val parallelized: Paral...
How to implement topological sort ? I think that the easiest way is to add to Queue vertives, which have zero in-degree. Loop Get vertex from queue ( let's say it is vertex v) and add to result list Decrement all in-degree of neighbours of v. If a neighbour will have in-degree...