COP 3530, Discrete Data Structures and Algorithms, Summer 1999, Homework 4 :: UFL Florida Computer Programming Homework

Class Notes Data Structures and AlgorithmsSummer-C Semester 1999 - M WRF 2nd Period CSE/E119, Section 7344 grooming 4 -- Due Wed 16 June 1999 09.30am -- Answer KeyAnswers are in blue typeface. * Question 1. Write pseudocode and a diagram that shows how to implement the shuffle part of the merge-sort algorithm using two stacks (one for each subsequence), and be sure to use the correct ADT operations for stacks. Do not write chocolate code, or pseudocode for merge-sort. Answer 1. Put the two sorted subsequences to be merged, denoted by S1 and S2 on stacks of the same name. Assume that the sorting is in ascending do hence, each stack has its minimum values at the top of the stack. 2. The merge algorithm proceeds as follows repeat until S1 or S2 is empty v1 = pop(S1) v2 = pop(S2) output(min(v1,v2)) if (max(v1,v2) = v1) then weight-lift v1 onto S1 else push v2 onto S2 endif