by Joseph Gama (1 Submission)
Category: Data Structures
Compatability: Visual Basic 5.0
Difficulty: Advanced
Date Added: Wed 3rd February 2021
Rating: 
(2 Votes)
* This is a Radix Sort Exchange routine which will work only on
* unsigned integers (unlike a general sorting function which
* works based on comparisons). Since its complexity overhead
* is pretty large, it is efficient on big array where the
* maximum number is bounded by a relatively small ceiling.
* E.g. a big array of bytes or shorts.
Assumes
* The algorithm is pretty simple:
* 1) It will first find the maximum and minimum radices in order to see
* if it can skip some radices. Then it proceeds to order
* from the numbers with the most-significant set-bit downwards
* 2) It leaves the unsorted segments of length == CUTOFF unsorted.
* 3) From higher bit to lower it will compare numbers
* based on the bit being scanned. This process is
* improved by using 2 pivots that will move 0's to the
* left and 1's to the right.
* 4) When finding the pivots it looks for the best case
* of all 0's or 1's to skip more scanning.
* 5) A low overhead Insertion Sort finishes the job.
*
* To make it an O(n*log(n)) algorithm in which the 'n'
* is proportional to the largest number in the sorted array
* requiers commenting Call InSort(t(), 1, up)
* and also commenting (up-lo>CUTOFF)AND
* Which is clearly detailed in the code
Download Gamasort, an improved Radix Sort Exchange Algorithm (96 KB)
VBcoders