I need to write an algorithm pseudocode that sorts a list of n elements in non-increasing order by finding the largest and smallest elements and exchanging those elements with the elements in the first and last positions. Then the size of the list is reduced by 2, excluding the two elements that are already in the proper positions, and the process is repeated on the remaining part of the list until the entire list is sorted. I also need to analyze the algorithm and show the results using order notation. I was trying to use arguments but I got stuck.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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I need to write an algorithm pseudocode that sorts a list of n elements in non-increasing order by finding the largest and smallest elements and exchanging those elements with the elements in the first and last positions. Then the size of the list is reduced by 2, excluding the two elements that are already in the proper positions, and the process is repeated on the remaining part of the list until the entire list is sorted. I also need to analyze the algorithm and show the results using order notation. I was trying to use arguments but I got stuck. 

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