Homework 6 Solved

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1. Using Warshallâ€™s algorithm, compute the reflexive-transitive closure of the relation below.
Show the matrix after the reflexive closure and then after each pass of the outermost for loop
that computes the transitive closure.
[0 0 0 0 1
1 0 0 0 0
0 0 1 1 0
0 0 1 0 0
1 0 1 0 1]

2. Using the matrix in the previous problem show the final result of executing Floydâ€™s
algorithm on that matrix to produce a matrix containing path lengths.
3. Show the graph that corresponds to the matrix in the first problem assuming the rows and
columns correspond to the vertices a, b, c, d and e. Show its condensation graph, renaming its
vertices. Determine any topological order of that graph and create an adjacency matrix with
the vertices ordered in that topological order. Finally compute the reflexive-transitive closure
of that matrix. What characteristic of that matrix indicates that it defines a total order?
4. Using Floydâ€™s algorithm, compute the distance matrix for the weight directed graph defined
by the following matrix:
[0 4 ï‚¥ 5
2 0 3 3
ï‚¥ 2 0 ï‚¥
âˆ’2 ï‚¥ âˆ’4 0]
Show the intermediate matrices after each iteration of the outermost loop.

• Using-Warshall.docx