Only the question 4 needs to be answered, and question 1is reference.
![(5 marks) Suppose that the depth-first search algorithm DFS is run on a digraph G = (V, E) from question 1. The DFS starts at the node 1 and selects either a next adjacent node, or a next tree root in the search forest in ascending numerical order 4. (a) Compute seenfo] and donelv] for all the nodes vEV ,2,3, 4,5,6,7 (b) Classify each arc e E as a tree arc (ta) in the DFS forest, or a forward arc (fa), or a cross arc (ca), or a back arc (ba); justify your classification, and tabulate the arcs and N (1,3) ,1) 3,2 Class Ce? C1.3 C2,1 C3,2 (7,3) wihere: Ce (: [ta,a, ca,a](https://d2vlcm61l7u1fs.cloudfront.net/media%2F0b4%2F0b4d4fce-a0d4-44fa-88c9-6a296921af51%2FphpkoDSYs.png)

(5
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Only the question 4 needs to be answered, and question 1is reference.
![(5 marks) Suppose that the depth-first search algorithm DFS is run on a digraph G = (V, E) from question 1. The DFS starts at the node 1 and selects either a next adjacent node, or a next tree root in the search forest in ascending numerical order 4. (a) Compute seenfo] and donelv] for all the nodes vEV ,2,3, 4,5,6,7 (b) Classify each arc e E as a tree arc (ta) in the DFS forest, or a forward arc (fa), or a cross arc (ca), or a back arc (ba); justify your classification, and tabulate the arcs and N (1,3) ,1) 3,2 Class Ce? C1.3 C2,1 C3,2 (7,3) wihere: Ce (: [ta,a, ca,a](https://d2vlcm61l7u1fs.cloudfront.net/media%2F0b4%2F0b4d4fce-a0d4-44fa-88c9-6a296921af51%2FphpkoDSYs.png)

(5
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