BFS and DFS in Graph BFS (Breadth First Search) Use queue (use deque or list in Python) Since graph may contain cycles (a node may be visited twice), we need a visited (list or set) to record visited nodes. Time Complexity: O(V+E), where V is the number of nodes and E is the number of edges. Auxiliary Space: O(V) BFS template code (using deque and set): # Python3 Program to print BFS traversal # from a given source vertex....