
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Graph G = (V, E); start vertex s; target vertex r; A-Star(G, s, r) in; out: maps as: V V
Local: Heuristic lower bound estimate h(u v), open list S, cost function g(u v),
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- Please show written work with answer!! An independent set in a graph is a set of vertices no two of which are adjacent to each other. A clique is a complete subgraph of a given graph. This means that there is an edge between any two nodes in the subgraph. The maximal clique is the complete subgraph of a given graph which contains the maximum number of nodes. We know that independent set is a NP complete problem. Transform the independent set to max clique (in polynomial time) to show that Max Clique is also NParrow_forwardVertex S denotes the start state and vertices G1 and G2 denote the two goal states. Directed edges are labelled with the actual costs of traversing the edge. What path from S to a goal would be found by Iterative deepening Depth-First Search? If all else is equal, consider states in alphabetic order. options are : a. S, A, B, C, D, E, F, G1 b. S, A, B, C, E, F, D, G1 c. S, A, B, C, E, F, G1 d. S, A, B, C, G1 e. S, A, C, G1 f. S, A, E, G1 g. S, B, A, C, E, G1 h. S, B, F, D, G2 i. S, C, B, F, A, D, E, G1 j. S, C, G1arrow_forwardTrue or False (If your answer to the question is "False", explain why, and provide correction when possible). (a) Let h(n) be the heuristics for the node n, h(m) be the heuristics for the node m, d(m,n) be the actual minimal cost from node m to n in a graph. A* satisfies the monotone restriction iff d(m,n) <= |h(n)-h(m)|. (b) If an A* heuristics is admissible then it satisfies the monotone restriction. (c) Best-first search guarantees optimality in its returned solution. (d) Least-cost-first search guarantees optimality in its returned solution. (e) If all edges are with unit cost, then Breadth-first search guarantees optimality in its returned solution.arrow_forward
- Let T be a tree. Let a be the minimum weight and b be the maximum weight over all the edge weights in T. Then the strength of T is (a2+b2). Input: An undirected weighted graph G. Task: Give an efficient algorithm for computing a spanning tree of G that maximizes the strength of the tree. Give an efficient algorithm (to the best of your knowledge) and a formal proof of correctness for your algorithm. An answer without any formal proof will be considered incomplete. Analyze the running time of the algorithm. You must write down your algorithm as pseudocodearrow_forwardmakeAlgorithmfo Algorithm A* for a monotonic evaluation function.A-Star(G, s, r)in: graph G = (V , E); start vertex s; goal vertex rout: mapping π : V → Vlocal: open list S; cost function g(u v); heuristic lower bound estimate h(u v)arrow_forwarda.Given the steps of Kruskal’s algorithm, analyze each loop and find its running time cost in terms of V and E. MST-KRUSKAL(G,w) A ← for each vertex v V MAKE-SET(v) sort E into non-decreasing order by w for each (u, v) taken from the sorted list if FIND-SET(u) FIND-SET(v) then A ← A {(u, v)} UNION(u, v) return A b. What is the total asymptotic running time of Kruskal’s algorithmarrow_forward
- Let G = (V, E) be an undirected graph and each edge e ∈ E is associated with a positive weight ℓ(e).For simplicity we assume weights are distinct. Is the following statement true or false? Let T be a minimum spanning tree for the graph with the original weight. Suppose we replace eachedge weight ℓ(e) with ℓ(e)^2, then T is still a minimum spanning tree.arrow_forwardDesign a dynamic programming algorithm for the bigger-is-smarterelephant problem by comparing it, as done previously, with the problem of finding thelongest weighted path within a directed level graph problem.arrow_forwardLet G be a graph with V vertices and E edges. One can implement Kruskal's Algorithm to run in O(E log V) time, and Prim's Algorithm to run in O(E + V log V) time. If G is a dense graph with an extremely large number of vertices, determine which algorithm would output the minimum-weight spanning tree more quickly. Clearly justify your answer.arrow_forward
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