Sort an array by using given digit frequency

Here given code implementation process.

import java.util.HashMap;
import java.util.ArrayList;
/*
    Java program for
    Sort an array by using given digit frequency
*/
public class Sorting
{

    public void printArray(int []arr, int n)
    {
        for (int i = 0; i < n ; ++i ) 
        {
            System.out.print("  "+arr[i]);    
        }

    }
    public int countDigit(int number, int k)
    {
        int n = number;
        if (n < 0)
        {
            // Convert negative number to positive number
            n = -n;
        }
        int count = 0;
        while (n != 0)
        {
            if(n % 10 == k)
            {
                count++;
            }
        
            // Remove last digit
            n = n / 10;
        }
        return count;
    }
    public void sortByDigitFrequency(int []arr, int n, int k)
    {
        if(k < 0 || k > 9)
        {
           
            // When k is not a valid single digit
            return ;
        }
        HashMap < Integer, ArrayList < Integer >> record = 
          new HashMap < Integer, ArrayList < Integer >> ();

        int frequency ;

        int index = 0;
        int max = 0;

        for (int i = 0; i < n ; ++i) 
        {
            
            frequency =  countDigit(arr[i],k);

            if(!record.containsKey(frequency))
            {
                record.put(frequency,new ArrayList<Integer>());
            }
            // Collect elements by frequency
            record.get(frequency).add(arr[i]);

            if(frequency > max)
            {
                max = frequency;
            }
        }

        frequency = 0;

        while(frequency <= max)
        {

            if(record.containsKey(frequency))
            {
                // Assign elements by frequency
                for ( int v : record.get(frequency) ) 
                {
                    arr[index] = v;

                    index++;    
                }
            }
            frequency ++;
        }

    }
    public static void main(String[] args)
    {

        Sorting task = new Sorting();

        int []arr = { 171, -12, -177, 15, 777, 30, 7 , 8 };

        // Get the number of elements
        int n = arr.length;

        // digit
        int k = 7;
        /*
            arr = [171, -12, -177, 15, 777, 30, 7 , 8]
            k = 7

                
                 [171, -12, -177, 15, 777, 30, 7 , 8]
                  │      │    │    │   │    │  │   │
                  │      │    │    │   │    │  │   │                  
                  │      │    │    │   │    │  │   │ 
                  ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
                ----------------------------------------
                        Occurrence of given K
                ---------------------------------------
                    

                [-12  15  30  8  171  7  -177  777]
                  ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
                --------------------------------------
                        Sort by Occurrence  
        */ 
        task.sortByDigitFrequency(arr,n,k); 

        // After sort
        // Display array elements
        task.printArray(arr,n);

    }
}

Output

  -12  15  30  8  171  7  -177  777
// Include header file
#include <iostream>
#include <unordered_map>
#include <vector>

using namespace std;
/*
    C++ program for
    Sort an array by using given digit frequency
*/
class Sorting
{
	public: void printArray(int arr[], int n)
	{
		for (int i = 0; i < n; ++i)
		{
			cout << "  " << arr[i];
		}
	}
	int countDigit(int number, int k)
	{
		int n = number;
		if (n < 0)
		{
			// Convert negative number to positive number
			n = -n;
		}
		int count = 0;
		while (n != 0)
		{
			if (n % 10 == k)
			{
				count++;
			}
			// Remove last digit
			n = n / 10;
		}
		return count;
	}
	void sortByDigitFrequency(int arr[], int n, int k)
	{
		if (k < 0 || k > 9)
		{
			// When k is not a valid single digit
			return;
		}
		unordered_map < int, vector < int > > record;
		int frequency;
		int index = 0;
		int max = 0;
		for (int i = 0; i < n; ++i)
		{
			frequency = this->countDigit(arr[i], k);
			// Collect elements by frequency
			record[frequency].push_back(arr[i]);
			if (frequency > max)
			{
				max = frequency;
			}
		}
		frequency = 0;
		while (frequency <= max)
		{
			if (record.find(frequency) != record.end())
			{
				// Assign elements by frequency
				for (auto &v: record[frequency])
				{
					arr[index] = v;
					index++;
				}
			}
			frequency++;
		}
	}
};
int main()
{
	Sorting *task = new Sorting();
	int arr[] = {
		171 , -12 , -177 , 15 , 777 , 30 , 7 , 8
	};
	// Get the number of elements
	int n = sizeof(arr) / sizeof(arr[0]);
	// digit
	int k = 7;
	/*
	    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
	    k = 7
	        
	         [171, -12, -177, 15, 777, 30, 7 , 8]
	          │      │    │    │   │    │  │   │
	          │      │    │    │   │    │  │   │                  
	          │      │    │    │   │    │  │   │ 
	          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
	        ----------------------------------------
	                Occurrence of given K
	        ---------------------------------------
	            
	        [-12  15  30  8  171  7  -177  777]
	          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
	        --------------------------------------
	                Sort by Occurrence  
	*/
	task->sortByDigitFrequency(arr, n, k);
	// After sort
	// Display array elements
	task->printArray(arr, n);
	return 0;
}

Output

  -12  15  30  8  171  7  -177  777
// Include namespace system
using System;
using System.Collections.Generic;
/*
    Csharp program for
    Sort an array by using given digit frequency
*/
public class Sorting
{
	public void printArray(int[] arr, int n)
	{
		for (int i = 0; i < n; ++i)
		{
			Console.Write("  " + arr[i]);
		}
	}
	public int countDigit(int number, int k)
	{
		int n = number;
		if (n < 0)
		{
			// Convert negative number to positive number
			n = -n;
		}
		int count = 0;
		while (n != 0)
		{
			if (n % 10 == k)
			{
				count++;
			}
			// Remove last digit
			n = n / 10;
		}
		return count;
	}
	public void sortByDigitFrequency(int[] arr, int n, int k)
	{
		if (k < 0 || k > 9)
		{
			// When k is not a valid single digit
			return;
		}
		Dictionary < int, List < int >> record = 
          new Dictionary < int, List < int >> ();
		int frequency;
		int index = 0;
		int max = 0;
		for (int i = 0; i < n; ++i)
		{
			frequency = this.countDigit(arr[i], k);
			if (!record.ContainsKey(frequency))
			{
				record.Add(frequency, new List < int > ());
			}
			// Collect elements by frequency
			record[frequency].Add(arr[i]);
			if (frequency > max)
			{
				max = frequency;
			}
		}
		frequency = 0;
		while (frequency <= max)
		{
			if (record.ContainsKey(frequency))
			{
				// Assign elements by frequency
				foreach(int v in record[frequency])
				{
					arr[index] = v;
					index++;
				}
			}
			frequency++;
		}
	}
	public static void Main(String[] args)
	{
		Sorting task = new Sorting();
		int[] arr = {
			171 , -12 , -177 , 15 , 777 , 30 , 7 , 8
		};
		// Get the number of elements
		int n = arr.Length;
		// digit
		int k = 7;
		/*
		    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
		    k = 7
		        
		         [171, -12, -177, 15, 777, 30, 7 , 8]
		          │      │    │    │   │    │  │   │
		          │      │    │    │   │    │  │   │                  
		          │      │    │    │   │    │  │   │ 
		          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
		        ----------------------------------------
		                Occurrence of given K
		        ---------------------------------------
		            
		        [-12  15  30  8  171  7  -177  777]
		          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
		        --------------------------------------
		                Sort by Occurrence  
		*/
		task.sortByDigitFrequency(arr, n, k);
		// After sort
		// Display array elements
		task.printArray(arr, n);
	}
}

Output

  -12  15  30  8  171  7  -177  777
package main
import "fmt"
/*
    Go program for
    Sort an array by using given digit frequency
*/

func printArray(arr[] int, n int) {
	for i := 0 ; i < n ; i++ {
		fmt.Print("  ", arr[i])
	}
}
func countDigit(number, k int) int {
	var n int = number
	if n < 0 {
		// Convert negative number to positive number
		n = -n
	}
	var count int = 0
	for (n != 0) {
		if n % 10 == k {
			count++
		}
		// Remove last digit
		n = n / 10
	}
	return count
}
func sortByDigitFrequency(arr[] int, n int, k int) {
	if k < 0 || k > 9 {
		// When k is not a valid single digit
		return
	}
	var record = make(map[int] []int )
	var frequency int
	var index int = 0
	var max int = 0
	for i := 0 ; i < n ; i++ {
		frequency = countDigit(arr[i], k)
		if _, found := record[frequency] ; !found {
			record[frequency] = make([]int,0)
		}
		// Collect elements by frequency
		record[frequency] = append(record[frequency], arr[i])
		if frequency > max {
			max = frequency
		}
	}
	frequency = 0
	for (frequency <= max) {
		if _, found := record[frequency] ; found {
			var value = record[frequency]
			// Assign elements by frequency
			for i := 0 ; i < len(value) ; i++ {
				arr[index] = value[i]
				index++
			}
		}
		frequency++
	}
}
func main() {

	var arr = [] int {171 , -12 , -177 , 15 , 777 , 30 , 7 , 8}
	// Get the number of elements
	var n int = len(arr)
	// digit
	var k int = 7
	/*
	    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
	    k = 7
	        
	         [171, -12, -177, 15, 777, 30, 7 , 8]
	          │      │    │    │   │    │  │   │
	          │      │    │    │   │    │  │   │                  
	          │      │    │    │   │    │  │   │ 
	          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
	        ----------------------------------------
	                Occurrence of given K
	        ---------------------------------------
	            
	        [-12  15  30  8  171  7  -177  777]
	          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
	        --------------------------------------
	                Sort by Occurrence  
	*/
	sortByDigitFrequency(arr, n, k)
	// After sort
	// Display array elements
	printArray(arr, n)
}

Output

  -12  15  30  8  171  7  -177  777
<?php
/*
    Php program for
    Sort an array by using given digit frequency
*/
class Sorting
{
	public	function printArray($arr, $n)
	{
		for ($i = 0; $i < $n; ++$i)
		{
			echo("  ".$arr[$i]);
		}
	}
	public	function countDigit($number, $k)
	{
		$n = $number;
		if ($n < 0)
		{
			// Convert negative number to positive number
			$n = -$n;
		}
		$count = 0;
		while ($n != 0)
		{
			if ($n % 10 == $k)
			{
				$count++;
			}
			// Remove last digit
			$n = (int)($n / 10);
		}
		return $count;
	}
	public	function sortByDigitFrequency(&$arr, $n, $k)
	{
		if ($k < 0 || $k > 9)
		{
			// When k is not a valid single digit
			return;
		}
		$record = array();
		$frequency;
		$index = 0;
		$max = 0;
		for ($i = 0; $i < $n; ++$i)
		{
			$frequency = $this->countDigit($arr[$i], $k);
			if (!array_key_exists($frequency, $record))
			{
				$record[$frequency] = array();
			}
			// Collect elements by frequency
			$record[$frequency][] = $arr[$i];
			if ($frequency > $max)
			{
				$max = $frequency;
			}
		}
		$frequency = 0;
		while ($frequency <= $max)
		{
			if (array_key_exists($frequency, $record))
			{
				// Assign elements by frequency
				foreach($record[$frequency] as $key => $value)
				{
					$arr[$index] = $value;
					$index++;
				}
			}
			$frequency++;
		}
	}
}

function main()
{
	$task = new Sorting();
	$arr = array(171, -12, -177, 15, 777, 30, 7, 8);
	// Get the number of elements
	$n = count($arr);
	// digit
	$k = 7;
	/*
	    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
	    k = 7
	        
	         [171, -12, -177, 15, 777, 30, 7 , 8]
	          │      │    │    │   │    │  │   │
	          │      │    │    │   │    │  │   │                  
	          │      │    │    │   │    │  │   │ 
	          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
	        ----------------------------------------
	                Occurrence of given K
	        ---------------------------------------
	            
	        [-12  15  30  8  171  7  -177  777]
	          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
	        --------------------------------------
	                Sort by Occurrence  
	*/
	$task->sortByDigitFrequency($arr, $n, $k);
	// After sort
	// Display array elements
	$task->printArray($arr, $n);
}
main();

Output

  -12  15  30  8  171  7  -177  777
/*
    Node JS program for
    Sort an array by using given digit frequency
*/
class Sorting
{
	printArray(arr, n)
	{
		for (var i = 0; i < n; ++i)
		{
			process.stdout.write("  " + arr[i]);
		}
	}
	countDigit(number, k)
	{
		var n = number;
		if (n < 0)
		{
			// Convert negative number to positive number
			n = -n;
		}
		var count = 0;
		while (n != 0)
		{
			if (n % 10 == k)
			{
				count++;
			}
			// Remove last digit
			n = parseInt(n / 10);
		}
		return count;
	}
	sortByDigitFrequency(arr, n, k)
	{
		if (k < 0 || k > 9)
		{
			// When k is not a valid single digit
			return;
		}
		var record = new Map();
		var index = 0;
		var max = 0;
      	var frequency = 0;
		for (var i = 0; i < n; ++i)
		{
			frequency = this.countDigit(arr[i], k);
			if (!record.has(frequency))
			{
				record.set(frequency, []);
			}
			// Collect elements by frequency
			record.get(frequency).push(arr[i]);
			if (frequency > max)
			{
				max = frequency;
			}
		}
		frequency = 0;
		while (frequency <= max)
		{
			if (record.has(frequency))
			{
              	let value = record.get(frequency);
              	
				// Assign elements by frequency
				for (var i = 0; i < value.length; ++ i)
				{
					arr[index] = value[i];
					index++;
				}
			}
			frequency++;
		}
	}
}

function main()
{
	var task = new Sorting();
	var arr = [171, -12, -177, 15, 777, 30, 7, 8];
	// Get the number of elements
	var n = arr.length;
	// digit
	var k = 7;
	/*
	    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
	    k = 7
	        
	         [171, -12, -177, 15, 777, 30, 7 , 8]
	          │      │    │    │   │    │  │   │
	          │      │    │    │   │    │  │   │                  
	          │      │    │    │   │    │  │   │ 
	          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
	        ----------------------------------------
	                Occurrence of given K
	        ---------------------------------------
	            
	        [-12  15  30  8  171  7  -177  777]
	          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
	        --------------------------------------
	                Sort by Occurrence  
	*/
	task.sortByDigitFrequency(arr, n, k);
	// After sort
	// Display array elements
	task.printArray(arr, n);
}
main();

Output

  -12  15  30  8  171  7  -177  777
#    Python 3 program for
#    Sort an array by using given digit frequency
class Sorting :
	def printArray(self, arr, n) :
		i = 0
		while (i < n) :
			print("  ", arr[i], end = "")
			i += 1
		
	
	def countDigit(self, number, k) :
		n = number
		if (n < 0) :
			#  Convert negative number to positive number
			n = -n
		
		count = 0
		while (n != 0) :
			if (n % 10 == k) :
				count += 1
			
			#  Remove last digit
			n = int(n / 10)
		
		return count
	
	def sortByDigitFrequency(self, arr, n, k) :
		if (k < 0 or k > 9) :
			#  When k is not a valid single digit
			return
		
		record = dict()
		index = 0
		max = 0
		i = 0
		while (i < n) :
			frequency = self.countDigit(arr[i], k)
			if (not(frequency in record.keys())) :
				record[frequency] = []
			
			#  Collect elements by frequency
			record.get(frequency).append(arr[i])
			if (frequency > max) :
				max = frequency
			
			i += 1
		
		frequency = 0
		while (frequency <= max) :
			if ((frequency in record.keys())) :
				for v in record.get(frequency):
					arr[index] = v
					index += 1
				
			
			frequency += 1
		
	

def main() :
	task = Sorting()
	arr = [171, -12, -177, 15, 777, 30, 7, 8]
	#  Get the number of elements
	n = len(arr)
	#  digit
	k = 7
	#    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
	#    k = 7
	#         [171, -12, -177, 15, 777, 30, 7 , 8]
	#          │      │    │    │   │    │  │   │
	#          │      │    │    │   │    │  │   │                  
	#          │      │    │    │   │    │  │   │ 
	#          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
	#        ----------------------------------------
	#                Occurrence of given K
	#        ---------------------------------------
	#        [-12  15  30  8  171  7  -177  777]
	#          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
	#        --------------------------------------
	#                Sort by Occurrence  
	task.sortByDigitFrequency(arr, n, k)
	#  After sort
	#  Display list elements
	task.printArray(arr, n)

if __name__ == "__main__": main()

Output

   -12   15   30   8   171   7   -177   777
#    Ruby program for
#    Sort an array by using given digit frequency
class Sorting 
	def printArray(arr, n) 
		i = 0
		while (i < n) 
			print("  ", arr[i])
			i += 1
		end

	end

	def countDigit(number, k) 
		n = number
		if (n < 0) 
			#  Convert negative number to positive number
			n = -n
		end

		count = 0
		while (n != 0) 
			if (n % 10 == k) 
				count += 1
			end

			#  Remove last digit
			n = n / 10
		end

		return count
	end

	def sortByDigitFrequency(arr, n, k) 
		if (k < 0 || k > 9) 
			#  When k is not a valid single digit
			return
		end

		record = Hash.new()
		index = 0
		max = 0
		i = 0
		while (i < n) 
			frequency = self.countDigit(arr[i], k)
			if (!record.key?(frequency)) 
				record[frequency] = []
			end

			#  Collect elements by frequency
			record[frequency].push(arr[i])
			if (frequency > max) 
				max = frequency
			end

			i += 1
		end

		frequency = 0
		while (frequency <= max) 
			if (record.key?(frequency)) 
                v = record[frequency]
            	i = 0
				#  Assign elements by frequency
				while (i < v.size()) 
					arr[index] = v[i]
					index += 1
					i += 1
				end

			end

			frequency += 1
		end

	end

end

def main() 
	task = Sorting.new()
	arr = [171, -12, -177, 15, 777, 30, 7, 8]
	#  Get the number of elements
	n = arr.length
	#  digit
	k = 7
	#    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
	#    k = 7
	#         [171, -12, -177, 15, 777, 30, 7 , 8]
	#          │      │    │    │   │    │  │   │
	#          │      │    │    │   │    │  │   │                  
	#          │      │    │    │   │    │  │   │ 
	#          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
	#        ----------------------------------------
	#                Occurrence of given K
	#        ---------------------------------------
	#        [-12  15  30  8  171  7  -177  777]
	#          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
	#        --------------------------------------
	#                Sort by Occurrence  
	task.sortByDigitFrequency(arr, n, k)
	#  After sort
	#  Display array elements
	task.printArray(arr, n)
end

main()

Output

  -12  15  30  8  171  7  -177  777
import scala.collection.mutable._;
/*
    Scala program for
    Sort an array by using given digit frequency
*/
class Sorting()
{
	def printArray(arr: Array[Int], n: Int): Unit = {
		var i: Int = 0;
		while (i < n)
		{
			print("  " + arr(i));
			i += 1;
		}
	}
	def countDigit(number: Int, k: Int): Int = {
		var n: Int = number;
		if (n < 0)
		{
			// Convert negative number to positive number
			n = -n;
		}
		var count: Int = 0;
		while (n != 0)
		{
			if (n % 10 == k)
			{
				count += 1;
			}
			// Remove last digit
			n = n / 10;
		}
		return count;
	}
	def sortByDigitFrequency(arr: Array[Int], n: Int, k: Int): Unit = {
		if (k < 0 || k > 9)
		{
			// When k is not a valid single digit
			return;
		}
		var record: HashMap[Int, ArrayBuffer[Int]] = 
          new HashMap[Int, ArrayBuffer[Int]]();
		var frequency: Int = 0;
		var index: Int = 0;
		var max: Int = 0;
		var i: Int = 0;
		while (i < n)
		{
			frequency = countDigit(arr(i), k);
			if (!record.contains(frequency))
			{
				record.addOne(frequency, new ArrayBuffer[Int]());
			}
			// Collect elements by frequency
			record.get(frequency).get += arr(i);
			if (frequency > max)
			{
				max = frequency;
			}
			i += 1;
		}
		frequency = 0;
		while (frequency <= max)
		{
			if (record.contains(frequency))
			{
				// Assign elements by frequency
				for ((value) <- record.get(frequency).get)
				{
					arr(index) = value;
					index += 1;
				}
			}
			frequency += 1;
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: Sorting = new Sorting();
		var arr: Array[Int] = Array(171, -12, -177, 15, 777, 30, 7, 8);
		// Get the number of elements
		var n: Int = arr.length;
		// digit
		var k: Int = 7;
		/*
		    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
		    k = 7
		        
		         [171, -12, -177, 15, 777, 30, 7 , 8]
		          │      │    │    │   │    │  │   │
		          │      │    │    │   │    │  │   │                  
		          │      │    │    │   │    │  │   │ 
		          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
		        ----------------------------------------
		                Occurrence of given K
		        ---------------------------------------
		            
		        [-12  15  30  8  171  7  -177  777]
		          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
		        --------------------------------------
		                Sort by Occurrence  
		*/
		task.sortByDigitFrequency(arr, n, k);
		// After sort
		// Display array elements
		task.printArray(arr, n);
	}
}

Output

  -12  15  30  8  171  7  -177  777
import Foundation;
/*
    Swift 4 program for
    Sort an array by using given digit frequency
*/
class Sorting
{
	func printArray(_ arr: [Int], _ n: Int)
	{
		var i: Int = 0;
		while (i < n)
		{
			print("  ", arr[i], terminator: "");
			i += 1;
		}
	}
	func countDigit(_ number: Int, _ k: Int) -> Int
	{
		var n: Int = number;
		if (n < 0)
		{
			// Convert negative number to positive number
			n = -n;
		}
		var count: Int = 0;
		while (n  != 0)
		{
			if (n % 10 == k)
			{
				count += 1;
			}
			// Remove last digit
			n = n / 10;
		}
		return count;
	}
	func sortByDigitFrequency(_ arr: inout[Int], _ n: Int, _ k: Int)
	{
		if (k < 0 || k > 9)
		{
			// When k is not a valid single digit
			return;
		}
		var record = [Int : [Int] ]();
		var frequency: Int;
		var index: Int = 0;
		var max: Int = 0;
		var i: Int = 0;
		while (i < n)
		{
			frequency = self.countDigit(arr[i], k);
			if (!record.keys.contains(frequency))
			{
				record[frequency] = [Int]();
			}
			// Collect elements by frequency
			record[frequency]!.append(arr[i]);
			if (frequency > max)
			{
				max = frequency;
			}
			i += 1;
		}
		frequency = 0;
		while (frequency <= max)
		{
			if (record.keys.contains(frequency))
			{
              	let value: [Int] = record[frequency]!;
                i = 0;
				// Assign elements by frequency
				while (i < value.count)
				{
					arr[index] = value[i];
					index += 1;
                  	i += 1;
				}
			}
			frequency += 1;
		}
	}
}
func main()
{
	let task: Sorting = Sorting();
	var arr: [Int] = [171, -12, -177, 15, 777, 30, 7, 8];
	// Get the number of elements
	let n: Int = arr.count;
	// digit
	let k: Int = 7;
	/*
	    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
	    k = 7
	        
	         [171, -12, -177, 15, 777, 30, 7 , 8]
	          │      │    │    │   │    │  │   │
	          │      │    │    │   │    │  │   │                  
	          │      │    │    │   │    │  │   │ 
	          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
	        ----------------------------------------
	                Occurrence of given K
	        ---------------------------------------
	            
	        [-12  15  30  8  171  7  -177  777]
	          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
	        --------------------------------------
	                Sort by Occurrence  
	*/
	task.sortByDigitFrequency(&arr, n, k);
	// After sort
	// Display array elements
	task.printArray(arr, n);
}
main();

Output

   -12   15   30   8   171   7   -177   777
/*
    Kotlin program for
    Sort an array by using given digit frequency
*/
class Sorting
{
	fun printArray(arr: Array < Int > , n: Int): Unit
	{
		var i: Int = 0;
		while (i < n)
		{
			print("  " + arr[i]);
			i += 1;
		}
	}
	fun countDigit(number: Int, k: Int): Int
	{
		var n: Int = number;
		if (n < 0)
		{
			// Convert negative number to positive number
			n = -n;
		}
		var count: Int = 0;
		while (n != 0)
		{
			if (n % 10 == k)
			{
				count += 1;
			}
			// Remove last digit
			n = n / 10;
		}
		return count;
	}
	fun sortByDigitFrequency(arr: Array < Int > , n: Int, k: Int): Unit
	{
		if (k < 0 || k > 9)
		{
			// When k is not a valid single digit
			return;
		}
		var record = HashMap < Int,MutableList< Int >> ();
		var frequency: Int;
		var index: Int = 0;
		var max: Int = 0;
		var i: Int = 0;
		while (i < n)
		{
			frequency = this.countDigit(arr[i], k);
			if (!record.containsKey(frequency))
			{
				record.put(frequency, mutableListOf < Int > ());
			}
			// Collect elements by frequency
			record.getValue(frequency).add(arr[i]);
			if (frequency > max)
			{
				max = frequency;
			}
			i += 1;
		}
		frequency = 0;
		while (frequency <= max)
		{
			if (record.containsKey(frequency))
			{
				// Assign elements by frequency
				for (v in record.getValue(frequency))
				{
					arr[index] = v;
					index += 1;
				}
			}
			frequency += 1;
		}
	}
}
fun main(args: Array < String > ): Unit
{
	val task: Sorting = Sorting();
	val arr: Array < Int > = arrayOf(171, -12, -177, 15, 777, 30, 7, 8);
	// Get the number of elements
	val n: Int = arr.count();
	// digit
	val k: Int = 7;
	/*
	    arr = [171, -12, -177, 15, 777, 30, 7 , 8]
	    k = 7
	        
	         [171, -12, -177, 15, 777, 30, 7 , 8]
	          │      │    │    │   │    │  │   │
	          │      │    │    │   │    │  │   │                  
	          │      │    │    │   │    │  │   │ 
	          ①     ⓪    ②   ⓪  ③   ⓪  ①  ⓪
	        ----------------------------------------
	                Occurrence of given K
	        ---------------------------------------
	            
	        [-12  15  30  8  171  7  -177  777]
	          ⓪   ⓪  ⓪  ⓪  ①  ①   ②   ③
	        --------------------------------------
	                Sort by Occurrence  
	*/
	task.sortByDigitFrequency(arr, n, k);
	// After sort
	// Display array elements
	task.printArray(arr, n);
}

Output

  -12  15  30  8  171  7  -177  777


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