Step 4: Calling DFS from the Main Loop

Now we'll fill in the `elif cmd == "dfs":` block to connect the command to our recursive function.

Guidance for Step 4

  • Fresh Start: Each time we run a `dfs` or `bfs` command, we must start with a **fresh** `visited` set. This is crucial for correct output.
  • Function Call: Call the `solve_dfs_recursive` helper function. The first argument is the node to start from, and the last argument is the set of visited nodes you just created.
  • Newline: After the traversal is complete, print a single newline character to separate the output from the next command's output. 
# ... inside the main for loop ...

    elif cmd == "dfs":
        start_node = int(line[1])

        # These must be reset for each new traversal
        visited_nodes = set() 
        
        # Call the recursive function
        solve_dfs_recursive(______, adj, ______)

        # Print a newline to end this command's output
        print("\n", end='')

    elif cmd == "bfs":
        pass # We will fill this in last
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