DirectedGraph(intN):n(N),adj(N,list<int>()){};voidaddEdge(intu,intv){//to add an edge u->v to graphadj[u].push_back(v); }boolisCyclic(){//If has back edge, then has cyclevector<bool> visited(n,false); unordered_set<int> recStack;//recursion stackfor(inti=0;i<n;++i...
Detect cycle in undirected graph: method 1: Union FindThe time complexity of the union-find algorithm is O(ELogV).
测试代码: publicclassSolution{publicstaticvoidmain(String[] args){Solutionso=newSolution();int[][] edges = {{0,1}, {1,2}, {2,0}};booleanresult=so.hasCycleDirectedGraph(3, edges); System.out.println(result); } } Detect Cycle in Undirected Graph 无向图找环 Given n nodes labeled from...
To detect if there is any cycle in the undirected graph or not, we will use the DFS traversal for the given graph. For every visited vertex v, when we have found any adjacent vertex u, such that u is already visited, and u is not the parent of vertex v. Then one cycle is detect...