Establish Proposition H. Bottom-up mergesort sorts an array of length N using at most 6N lg N array accesses and between 12 N lg N and N lg N comparisons.

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A: The question is to find the actual working of the code given in Algorithm Q1.

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A: Dear Student, As no programming language is mentioned I am assuming it to be C++.

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A potential method of analysis

The complexity of the algorithm model emphasizes the potential method. This method is useful for examining a data structure's amortized time and space complexity.