Critical edges.An MST edge whose deletion from the graph would cause the MST weight to increase is called a critical edge. Show how to find all critical edges in a graph in time proportional to Elog E. Note: This question assumes that edge weights are not necessarily distinct (otherwise all edges in the MST are critical). Hint: Apply exercises 4.1.36 and show that an edge eis critical if and only if it is a bridgein the subgraph containing all edges with weight less than or equal to the weight of edge e.
Exercises4.1.36:
Two-edge connectivity.A bridgein a graph is an edge that, if removed, would increase the number of connected components. A graph that has no bridges is said to be two-edge connected.Develop a linear-time DFS-based algorithm for determining finding all bridges in a graph (and determining whether it is two-edge connected).
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