Stalin Sort

January 19, 2021

Stalin Sort is a single-pass sort that operates in O(1) space and O(n) time. Iterate down the list of elements checking if they are in order. Any element which is out of order is sent to the gulag (eliminated from the list). At the end you have a sorted list, though it may not be a permutation of the original list. As an example, the list (1 2 5 3 5 7) is Stalin-sorted as (1 2 5 5 7); the 3 is dropped because it is less than the 5 that it follows.

Your task is to write a program that implements Stalin sort. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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