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 ...
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...
UndirectedGraph(intN):n(N),adj(N,list<int>()){};voidaddEdge(intu,intv){//to add an edge u-v to graphadj[u].push_back(v); adj[v].push_back(u); }boolisCyclic(){//if visited before and not parent, then has cyclevector<bool> visited(n,false);for(inti=0;i<n;++i){if(...
1packageleetcode;23publicclassDetectCycle {4publicListNode detectCycle(ListNode head) {5ListNode s=head;6ListNode f=head;7while(f!=null&&f.next!=null){8s=s.next;9f=f.next.next;10if(s==f){11break;12}13}14if(f==null||f.next==null)15returnnull;16s=head;17while(s!=f){18s=s.nex...