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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 sta...
Input a simple undirected weighted graph G with non-negative edge weights (represented by w), and a...
Input a simple undirected weighted graph G with non-negative edge weights (represented by w), and a source node v of G. Output: TDB. D: a vector indexed by the vertices of G. Q: priority queue containing the vertices of G using D[] as key D[v]=0; for (all vertex ut-v) [D[u]-infinity:) while not Q. empty() 11 Q is not empty fu - Q.removein(); // retrieve a vertex of Q with min D value for (all vertex : adjacent to u such...
a. (15 marks) i (7 marks) Consider the weighted directed graph below. Carry out the steps...
a. (15 marks) i (7 marks) Consider the weighted directed graph below. Carry out the steps of Dijkstra's shortest path algorithm as covered in lectures, starting at vertex S. Consequently give the shortest path from S to vertex T and its length 6 A 2 3 4 S T F ii (2 marks) For a graph G = (V, E), what is the worst-case time complexity of the version of Dijkstra's shortest path algorithm examined in lectures? (Your answer should...
can you please solve this CORRECTLY? Exercise 4 - Shortest path (25 pts) Using Dijkstra's algorithm,...
can you please solve this CORRECTLY?
Exercise 4 - Shortest path (25 pts) Using Dijkstra's algorithm, find the shortest path from A to E in the following weighted graph: a- Once done, indicate the sequence (min distance, previous node) for nodes D and E. (15pts) b- Below is a high-level code for Dijkstra's algorithm. The variables used in the code are self-explanatory. Clearly explain why its running time (when we use a min-heap to store the values min distance of...
Problem #1 Let a "path" on a weighted graph G = (V,E,W) be defined as a...
Problem #1 Let a "path" on a weighted graph G = (V,E,W) be defined as a sequence of distinct vertices V-(vi,v2, ,%)-V connected by a sequence of edges {(vi, t), (Ug, ta), , (4-1,Un)) : We say that (V, E) is a path from tovn. Sketch a graph with 10 vertices and a path consisting of 5 vertices and four edges. Formulate a binary integer program that could be used to find the path of least total weight from one...
Let G = (V, E, w) be a connected weighted undirected graph. Given a vertex s...
Let G = (V, E, w) be a connected weighted undirected graph. Given a vertex s ∈ V and a shortest path tree Ts with respect to the source s, design a linear time algorithm for checking whether the shortest path tree Ts is correct or not.(C pseudo)
Problem 6. (Weighted Graph Reduction) Your friend has written an algorithm which solves the all pairs shortest path pr...
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...
5. Here are the vertices and edges of directed graph G: V= {2.6.c.de.f} E= {ab, ac,...
5. Here are the vertices and edges of directed graph G: V= {2.6.c.de.f} E= {ab, ac, af ca. bc. be.bf. cd, ce, de, df). Weights: w(ab) = 2 w(ac) = 5, w(af) = 10, w(ca) = 2. w(be) = 2. w(be) = 10, w(bf) = 11. w(cd)= 9. w(ce) = 7. w(de) = 2. w(df) = 2. a. Draw the Graph. This is a directed, weighted graph so you need to include arrows and weights. You can insert a pic...
Problem 1: Shortest Path-ish Suppose that you want to get from vertex s to vertex t in an...
Problem 1: Shortest Path-ish Suppose that you want to get from vertex s to vertex t in an unweighted graph G = (V, E), but you would like to stop by vertex u if it is possible to do so without increasing the length of your path by more than a factor of a. Describe an efficient algorithm that would determine an optimal s-t path given your preference for stopping at u along the way if doing so is not prohibitively costly....
graph G, let Bi(G) max{IS|: SC V(G) and Vu, v E S, d(u, v) 2 i},...
graph G, let Bi(G) max{IS|: SC V(G) and Vu, v E S, d(u, v) 2 i}, 10. (7 points) Given a where d(u, v) is the length of a shortest path between u and v. (a) (0.5 point) What is B1(G)? (b) (1.5 points) Let Pn be the path with n vertices. What is B;(Pn)? (c) (2 points) Show that if G is an n-vertex 3-regular graph, then B2(G) < . Further- more, find a 3-regular graph H such that...
10. You are given a directed graph G(V, E) where every vertex vi E V is...
10. You are given a directed graph G(V, E) where every vertex vi E V is associated with a weight wi> 0. The length of a path is the sum of weights of all vertices along this path. Given s,t e V, suggest an O((n+ m) log n) time algorithm for finding the shortest path m s toO As usual, n = IVI and m = IEI.
Input a simple undirected weighted graph G with non-negative edge weights (represented by w), and a source node v of G. Output: TDB. D: a vector indexed by the vertices of G. Q: priority queue containing the vertices of G using D[] as key D[v]=0; for (all vertex ut-v) [D[u]-infinity:) while not Q. empty() 11 Q is not empty fu - Q.removein(); // retrieve a vertex of Q with min D value for (all vertex : adjacent to u such...
a. (15 marks) i (7 marks) Consider the weighted directed graph below. Carry out the steps of Dijkstra's shortest path algorithm as covered in lectures, starting at vertex S. Consequently give the shortest path from S to vertex T and its length 6 A 2 3 4 S T F ii (2 marks) For a graph G = (V, E), what is the worst-case time complexity of the version of Dijkstra's shortest path algorithm examined in lectures? (Your answer should...
can you please solve this CORRECTLY?
Exercise 4 - Shortest path (25 pts) Using Dijkstra's algorithm, find the shortest path from A to E in the following weighted graph: a- Once done, indicate the sequence (min distance, previous node) for nodes D and E. (15pts) b- Below is a high-level code for Dijkstra's algorithm. The variables used in the code are self-explanatory. Clearly explain why its running time (when we use a min-heap to store the values min distance of...
Problem #1 Let a "path" on a weighted graph G = (V,E,W) be defined as a sequence of distinct vertices V-(vi,v2, ,%)-V connected by a sequence of edges {(vi, t), (Ug, ta), , (4-1,Un)) : We say that (V, E) is a path from tovn. Sketch a graph with 10 vertices and a path consisting of 5 vertices and four edges. Formulate a binary integer program that could be used to find the path of least total weight from one...
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...
5. Here are the vertices and edges of directed graph G: V= {2.6.c.de.f} E= {ab, ac, af ca. bc. be.bf. cd, ce, de, df). Weights: w(ab) = 2 w(ac) = 5, w(af) = 10, w(ca) = 2. w(be) = 2. w(be) = 10, w(bf) = 11. w(cd)= 9. w(ce) = 7. w(de) = 2. w(df) = 2. a. Draw the Graph. This is a directed, weighted graph so you need to include arrows and weights. You can insert a pic...
graph G, let Bi(G) max{IS|: SC V(G) and Vu, v E S, d(u, v) 2 i}, 10. (7 points) Given a where d(u, v) is the length of a shortest path between u and v. (a) (0.5 point) What is B1(G)? (b) (1.5 points) Let Pn be the path with n vertices. What is B;(Pn)? (c) (2 points) Show that if G is an n-vertex 3-regular graph, then B2(G) < . Further- more, find a 3-regular graph H such that...
10. You are given a directed graph G(V, E) where every vertex vi E V is associated with a weight wi> 0. The length of a path is the sum of weights of all vertices along this path. Given s,t e V, suggest an O((n+ m) log n) time algorithm for finding the shortest path m s toO As usual, n = IVI and m = IEI.
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