Posted: November 11th, 2015

Computer

Computer

Suppose that initially you are given an array with unsorted unsigned numbers. Radix sort sorts numbers by processing individual digits and can process digits of each number either starting from the least significant (LSD) or the most significant digit (MSD). We will use LSD sorting.

During the first pass in LSD, numbers in the array are grouped based on the least significant digit. During the second pass, numbers are grouped again using the last but one least significant digit but otherwise keeping the original order of numbers. This operation is continued until numbers are grouped for all digits with the final result being the sorted array.

Here, you can find the C and Java implementations of Radix Sort with comments.

http://www.geeksforgeeks.org/radix-sort/

Radix sort uses counting sort as a subroutine to sort. The number of occurrences for each digit at the corresponding position is counted and stored in the dedicated array “count”. Then using count array the absolute position for each group of digits within array is calculated. Next, numbers are placed into temporary array (“output”) at the locations specified by corresponding values. Finally output array is copied to the original array.

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