# asg13 - Problem 3 Matrix Multiplication The product of two...

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COP 3530 Assignment 13 Due: 9 th Dec 2009 Problem 1 Merge Sort & Quick Sort Start with the array [21, 25, 49, 25, 93, 62, 72, 8, 37, 16, 54], 1) Draw a figure similar to Figure 19.9 on page 762 that shows the steps involved in a merge sort. 2) Draw the process of quick sort. Use the first element of the array segment as pivot. Specify each step clearly. Problem 2 Minimum-cost spanning tree Consider the undirected graph G below. (a) Using Kruskal's method, construct a minimum-cost spanning tree. Draw the spanning tree that is constructed and also give the steps (draw figures and state the decision made at each step) used to arrive at this tree. (b) Do part (a) using Prim's method instead of Kruskal's method. Choose vertex 1 as your starting vertex.

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Unformatted text preview: Problem 3: Matrix Multiplication The product of two n x n matrices X and Y is a third n x n matrix Z with (i,j) th entry of Z given as This can be graphically depicted as multiplying a row of X with a column of Y as follows: 1. Devise a divide-and-conquer algorithm for solving this problem. Explain your solution clearly in words. 2. Write the pseudo-code for the solution you have proposed. 3. Derive the time complexity of your solution. Show each step clearly. Note that the simple method described above takes O(n 3 ). [Hint: Consider n/2 x n/2 sub-matrices of matrices X and Y. There are four such sub-matrices in each X and Y. Relate them to the corresponding sub-matrices of Z]...
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