int[][] edges = {{0, 1}, {1, 2}, {2, 0}}; boolean result = so.hasCycleDirectedGraph(3, edges); System.out.println(result); } } Detect Cycle in Undirected Graph 无向图找环 Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of n...
Detect cycle in a directed graph is using aDFS. Depth First Traversal can be used to detect cycle in a Graph. DFS for a connected graph produces a tree. There is a cycle in a graph only if there is aback edgepresent in the graph. A back edge is an edge that is from a node to ...
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...