Rework your implementation of dfs in this next cell

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Question: Rework your implementation of DFS in this next cell to allow it to generate pre and post order numbers for each node. Your smallest preorder number should be 1. Your largest postorder number should be 2×(number of vertices) . Return two lists of tuples. Each list should contain a tuple of two values Tuple(Node, Time Visited). The first list should contain the tuples with the preorder visits, and the second list should contain the tuples with the postorder visits. We have provided some boiler plate code to get you started. Feel free to write your own if you find that easier. Feel free to refer to Figure 3.6(b) in section 3.2.3 of the DPV notes for how your pre and post order values should look like. If the input was the left most component, you should return [(A, 1), (B, 2), (E, 4), (I, 5), (J, 6)], [(B, 3), (J, 7), (I, 8), (E, 9), (A, 10)]. Both lists should be sorted according to the second element in the tuple.

Reference no: EM133551258

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