For the directed weighted graph given below find shortest distances and shortest paths from A to all other vertices. Use the Dijkstra algorithm. Show the status of the array of distances after each iteration of the while loop.
A | B | C | D | E | F | G | H | I |
0 | ||||||||
0 | 1 | 2 | ||||||
0 | 1 | 2 | 3 | |||||
0 | 1 | 2 | 3 | 4 | ||||
0 | 1 | 5 | 2 | 3 | 5 | 4 | 5 | 5 |
0 | 1 | 5 | 2 | 3 | 5 | 4 | 5 | 5 |
0 | 1 | 5 | 2 | 3 | 5 | 4 | 5 | 5 |
0 | 1 | 5 | 2 | 3 | 5 | 4 | 5 | 5 |
0 | 1 | 5 | 2 | 3 | 5 | 4 | 5 | 5 |
0 | 1 | 5 | 2 | 3 | 5 | 4 | 5 | 5 |
For the directed weighted graph given below find shortest distances and shortest paths from A to...
Consider the problem of finding the shortest paths in a weighted directed graph using Dijkstra's algorithm. Denote the set of vertices as V, the number of vertices as |V|, the set of edges as E, and the number of edges as |E|. Answer the following questions.Below is a pseudo-code of the algorithm that computes the length c[v] of the shortest path from the start node s to each node v. Answer code to fill in the blank _______ .
10) Shortest Paths (10 marks) Some pseudocode for the shortest path problem is given below. When DIJKSTRA (G, w,s) is called, G is a given graph, w contains the weights for edges in G, and s is a starting vertex DIJKSTRA (G, w, s) INITIALIZE-SINGLE-SOURCE(G, s) 1: RELAX (u, v, w) 1: if dlv] > dlu (u, v) then 2d[v] <- d[u] +w(u, v) 3 4: end if 4: while Q φ do 5: uExTRACT-MIN Q) for each vertex v...
Shortest paths Consider a directed graph with vertices fa, b, c, d, e, f and adjacency list representation belovw (with edge weights in parentheses): a: b(4), f(2) e: a(6), b(3), d(7) d: a(6), e(2) e: d(5) f: d(2), e(3) (i) Find three shortest paths from c to e. (ii) Which of these paths could have been found by Dijkstra's shortest path algorithm? (Give a convincing explanation by referring to the main steps of the algorithm.)
Algorithm Question 5. Below is a graph with edge lengths. Apply Dijkstra's algorithm to find the shortest paths, starting at vertex A, to all other vertices. Write down the sequence in which the edges are chosen, breaking ties by using vertices at the same length in alphabetic orde. 3 Ga 2 5. Below is a graph with edge lengths. Apply Dijkstra's algorithm to find the shortest paths, starting at vertex A, to all other vertices. Write down the sequence in...
Problem 6. (Weighted Graph Reduction) Your friend has written an algorithm which solves the all pairs shortest path problem for unweighted undirected graphs. The cost of a path in this setting is the number of edges in the path. The algorithm UNWEIGHTEDAPSP takes the following input and output: UNWEİGHTEDA PSP Input: An unweighted undirected graph G Output: The costs of the shortest paths between each pair of vertices fu, v) For example, consider the following graph G. The output of...
Run the Dijkstra’s algorithm on the directed graph of the following figure 24.6, using vertex t as the source. In the style of Figure 24.6, show the d and ? values and the vertices in set S after each iteration of the while loop. 1 8 10 I 10 14 4 6 4 6 2 3 2 3 4 6 5 5 2 (a) (c) 1 10 13 4 6 (d) (e) Figure 24.6 The execution of Dijkstra's algorithm. The...
Consider the following weighted, directed graph G. There are 7 vertices and 10 edges. The edge list E is as follows:The Bellman-Ford algorithm makes |V|-1 = 7-1 = 6 passes through the edge list E. Each pass relaxes the edges in the order they appear in the edge list. As with Dijkstra's algorithm, we record the current best known cost D[V] to reach each vertex V from the start vertex S. Initially D[A]=0 and D[V]=+oo for all the other vertices...
5. (10 pts) Give a concrete example of a directed and weighted graph G and two vertices u and v, where the Dijkstra's algorithm does not find the shortest path from u to v in G but the Bellman-Ford algorithm does. Obviously such a graph must have at least one negative- weight edge.
2. (a) (2 points - Completeness) Dijkstra's Walk-through Dijkstra's algorithm to compute the shortest paths from A to every other node in the given graph Show your steps in the table below. Do this by crossing out old values and writing in new ones as the algorithm proceeds 25 9 7 (D-G) 19 14 (B-E) 4 (A-C) 2 2 (G-H) Vertex Visited Cost Previous (b) (6 points-Correctness) All Vertices, in Order Visited: Visited-= Found the Shortest Path to) (c) (2...
You're running Dijkstra's algorithm to find all shortest paths starting with vertex A in the graph below, but you pause after vertex E has been added to the solution (and the relaxation step for vertex E has been performed). Annotate the graph as follows: (1) label each node with its current dist value, (2) darken the edges that are part of the current spanning tree (i.e., the parent links), (3) draw a dotted circle around the "cloud'' of vertices that...