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Exercises 26.3-1


Run the Ford-Fulkerson algorithm on the flow network in Figure 26.8(b) and show the residual network after each flow augmentation. Number the vertices in L top to bottom from 1 to 5 and in R top to bottom from 6 to 9. For each iteration, pick the augmenting path that is lexicographically smallest.

Answer

Exercise 26.3-5


We say that bipartie graph G = (V, E), where V = L ∪ R is d-regular if every vertex v ∈ V has degree exactly d. Every d-regular bipartie graph has |L|=|R|. Prove that every d-regular bipartite graph has a matching of cardinality |L| by arguing that a minimum cut of the corresponding flow network has capacity |L|.

Answer

Consider the corresponding network flow graph G' to k-regular graph G:


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