Golang React JS Technology Blog

Golang program for implementation of Radix Sort

Radix Sort is a clever and intuitive little sorting algorithm. Radix Sort puts the elements in order by comparing the digits of the numbers. Radix sort is an integer sorting algorithm that sorts data with integer keys by grouping the keys by individual digits that share the same significant position and value (place value). Radix sort uses counting sort as a subroutine to sort an array of numbers.

Example

package main
 
import (
    "bytes"
    "encoding/binary"	
    "fmt"
)

const digit = 4
const maxbit = -1 << 31
 

func main() {

	var data = []int32{421, 15, -175, 90, -2, 214, -52, -166}
	fmt.Println("\n--- Unsorted --- \n\n", data)
	radixsort(data)
	fmt.Println("\n--- Sorted ---\n\n", data, "\n")
} 

func radixsort(data []int32) {
    buf := bytes.NewBuffer(nil)
    ds := make([][]byte, len(data))
    for i, e := range data {
        binary.Write(buf, binary.LittleEndian, e^maxbit)
        b := make([]byte, digit)
        buf.Read(b)
        ds[i] = b
    }
    countingSort := make([][][]byte, 256)
    for i := 0; i < digit; i++ {
        for _, b := range ds {
            countingSort[b[i]] = append(countingSort[b[i]], b)
        }
        j := 0
        for k, bs := range countingSort {
            copy(ds[j:], bs)
            j += len(bs)
            countingSort[k] = bs[:0]
        }
    }   
    var w int32
    for i, b := range ds {
        buf.Write(b)
        binary.Read(buf, binary.LittleEndian, &w)
        data[i] = w^maxbit
    }   
}

Output

--- Unsorted ---

 [421 15 -175 90 -2 214 -52 -166]

--- Sorted ---

 [-175 -166 -52 -2 15 90 214 421]
Most Helpful This Week
Golang program for implementation of Tower of Hanoi Algorithm Golang program for implementation of Bubble Sort Golang program for implementation of Levenshtein distance Golang program to implement Binary Tree Golang program for implementation of Interpolation Search Golang program for implementation of ZigZag Matrix