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class Solution { public: // Function to detect cycle in an undirected graph. bool dfs(int node, int parent, vector<int> adj[], vector<bool> & visited) { visited[node] = true; for(int neigh : adj[node]) { if(!visited[neigh] ) { if(dfs(neigh, node, adj, visited)) { return true; } } else if(neigh != parent) { return true; } } return false; } bool isCycle(int V, vector<int> adj[]) { bool res = false; vector<bool> visited(V + 2, false); for(int i = 0; i < V; i++) { if(!visited[i]) { if(dfs(i, -1, adj, visited)) { return true; } } } return false; } };
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