The dynamic programming algorithm of Algorithm 14.11 uses O(n 3 ) space. Describe a version of this
Question:
The dynamic programming algorithm of Algorithm 14.11 uses O(n3) space. Describe a version of this algorithm that uses O(n2) space.
Algorithm 14.11
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Algorithm AllPairsShortestPaths(G): Input: A simple weighted directed graph G without negative-weight cycles Output: A numbering v1, v2, ..., Un of the vertices of G and a matrix D, such that D[i, j] is the distance from vị to v; in G let v1, v2, ..., Vn be an arbitrary numbering of the vertices of G for i 1 to n do for j +1 to n do if i = j then D°[i, i] – 0 if (v;, v;) is an edge in G then D°[i, j] – w(v;, v;)) 一 else D°li, j] - +o for k + 1 to n do for i - 1 to n do for j 1 to n do D*[i, j] - min{Dk-1[i, j], Dk-1[i, k] + Dk-1{k, j]} return matrix D"
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To reduce the space complexity of Algorithm 1411 from On3 to On2 we can mak...View the full answer
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Related Book For
Algorithm Design And Applications
ISBN: 9781118335918
1st Edition
Authors: Michael T. Goodrich, Roberto Tamassia
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