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Find all odd frequency elements from an Array

Here given code implementation process.

// Java Program 
// Find all odd frequency elements from an Array
import java.util.HashMap;
public class Frequency
{

    public void OddOccurrence(int[] arr, int n)
    {
        // Use to count frequency
        HashMap < Integer, Integer > record = new HashMap < Integer, Integer > ();
        
        boolean result = false;

        int i = 0;

        System.out.print("\nArray Elements\n");

        // Display array element
        for ( i = 0; i < n ; i++ ) 
        {
            System.out.print("  "+arr[i]);
        }
        System.out.print("\n Result :");
      
        // Execute loop through by array size n
        for ( i = 0; i < n; i++)
        {
            if (record.containsKey(arr[i]))
            {
                // increase element frequency
                record.put(arr[i], record.get(arr[i]) + 1);
            }
            else
            {
                // Add new element
                record.put(arr[i], 1);
            }
        }

        // Finding odd occurrence element and sum of its elements
        for (int key: record.keySet())
        {
             if ((record.get(key) % 2) != 0)
            {
                System.out.print("  "+key);
                result = true;
            }
        }


        if(result==false)
        {
            System.out.print(" None \n");
        }
       
    }
    public static void main(String[] args)
    {
        Frequency task = new Frequency();

        int []arr = 
        {
            4 , 6 , 2 , 8 , 1 , -2 , 4 , 2 , 1 , 1
        };
        // Get the size of array
        int n = arr.length;
        // Test
        task.OddOccurrence(arr, n);
    }
}

Output

Array Elements
  4  6  2  8  1  -2  4  2  1  1
 Result :  1  -2  6  8

// Include header file
#include <iostream>

#include <unordered_map>

using namespace std;
// C++ Program
// Find all odd frequency elements from an Array
class Frequency
{
	public: void OddOccurrence(int arr[], int n)
	{
		// Use to count frequency
		unordered_map < int, int > record ;
		bool result = false;
		int i = 0;
		cout << "\nArray Elements\n";
		// Display array element
		for (i = 0; i < n; i++)
		{
			cout << "  " << arr[i];
		}
		cout << "\n Result :";
		// Execute loop through by array size n
		for (i = 0; i < n; i++)
		{
			if (record.find(arr[i]) != record.end())
			{
				// increase element frequency
				record[arr[i]] = record[arr[i]] + 1;
			}
			else
			{
				// Add new element
				record[arr[i]] = 1;
			}
		}
		for (auto &info: record)
		{
			if ((info.second % 2) != 0)
			{
				cout << "  " << info.first;
				result = true;
			}
		}
		if (result == false)
		{
			cout << " None \n";
		}
	}
};
int main()
{
	Frequency task = Frequency();
	int arr[] = {
		4 , 6 , 2 , 8 , 1 , -2 , 4 , 2 , 1 , 1
	};
	// Get the size of array
	int n = sizeof(arr) / sizeof(arr[0]);
	// Test
	task.OddOccurrence(arr, n);
	return 0;
}

Output

Array Elements
  4  6  2  8  1  -2  4  2  1  1
 Result :  -2  1  6  8

// Include namespace system
using System;
using System.Collections.Generic;
// C# Program
// Find all odd frequency elements from an Array
public class Frequency
{
	public void OddOccurrence(int[] arr, int n)
	{
		// Use to count frequency
		Dictionary < int, int > record = new Dictionary < int, int > ();
		// result indicator
		Boolean result = false;
		int i = 0;
		Console.Write("\nArray Elements\n");
		// Display array element
		for (i = 0; i < n; i++)
		{
			Console.Write("  " + arr[i]);
		}
		Console.Write("\n Result :");
		// Execute loop through by array size n
		for (i = 0; i < n; i++)
		{
			if (record.ContainsKey(arr[i]))
			{
				// increase element frequency
				record[arr[i]] = record[arr[i]] + 1;
			}
			else
			{
				// Add new element
				record.Add(arr[i], 1);
			}
		}
		foreach(KeyValuePair < int, int > info in record)
		{
			if ((info.Value % 2) != 0)
			{
				Console.Write("  " + info.Key);
				result = true;
			}
		}
		if (result == false)
		{
			Console.Write(" None \n");
		}
	}
	public static void Main(String[] args)
	{
		Frequency task = new Frequency();
		int[] arr = {
			4 , 6 , 2 , 8 , 1 , -2 , 4 , 2 , 1 , 1
		};
		// Get the size of array
		int n = arr.Length;
		// Test
		task.OddOccurrence(arr, n);
	}
}

Output

Array Elements
  4  6  2  8  1  -2  4  2  1  1
 Result :  6  8  1  -2

<?php
// Php Program
// Find all odd frequency elements from an Array
class Frequency
{
	public	function OddOccurrence( & $arr, $n)
	{
		// Use to count frequency
		$record = array();
		// result indicator
		$result = false;
		$i = 0;
		echo "\nArray Elements\n";
		// Display array element
		for ($i = 0; $i < $n; $i++)
		{
			echo "  ".$arr[$i];
		}
		echo "\n Result :";
		// Execute loop through by array size n
		for ($i = 0; $i < $n; $i++)
		{
			if (array_key_exists($arr[$i], $record))
			{ // increase element frequency
				$record[$arr[$i]] = $record[$arr[$i]] + 1;
			}
			else
			{ // Add new element
				$record[$arr[$i]] = 1;
			}
		}
		foreach($record as $key => $value)
		{
			if (($value % 2) != 0)
			{
				echo "  ".$key;
				$result = true;
			}
		}
		if ($result == false)
		{
			echo " None \n";
		}
	}
}

function main()
{
	$task = new Frequency();
	$arr = array(4, 6, 2, 8, 1, -2, 4, 2, 1, 1);
	// Get the size of array
	$n = count($arr); // Test
	$task->OddOccurrence($arr, $n);
}
main();

Output

Array Elements
  4  6  2  8  1  -2  4  2  1  1
 Result :  6  8  1  -2

// Node Js Program
// Find all odd frequency elements from an Array
class Frequency
{
	OddOccurrence(arr, n)
	{
		// Use to count frequency
		var record = new Map();
		// result indicator
		var result = false;
		var i = 0;
		process.stdout.write("\nArray Elements\n");
		// Display array element
		for (i = 0; i < n; i++)
		{
			process.stdout.write("  " + arr[i]);
		}
		process.stdout.write("\n Result :");
		// Execute loop through by array size n
		for (i = 0; i < n; i++)
		{
			if (record.has(arr[i]))
			{
				// increase element frequency
				record.set(arr[i], record.get(arr[i]) + 1);
			}
			else
			{
				// Add new element
				record.set(arr[i], 1);
			}
		}
		for (let [key, value] of record)
		{
			if ((record.get(key) % 2) != 0)
			{
				process.stdout.write("  " + key);
				result = true;
			}
		}
		if (result == false)
		{
			process.stdout.write(" None \n");
		}
	}
}

function main()
{
	var task = new Frequency();
	var arr = [4, 6, 2, 8, 1, -2, 4, 2, 1, 1];
	// Get the size of array
	var n = arr.length;
	// Test
	task.OddOccurrence(arr, n);
}
main();

Output

Array Elements
  4  6  2  8  1  -2  4  2  1  1
 Result :  6  8  1  -2

#  Python 3 Program
#  Find all odd frequency elements from an Array
class Frequency :
	def OddOccurrence(self, arr, n) :
		#  Use to count frequency
		record = dict()
		#  result indicator
		result = False
		i = 0
		print("\nArray Elements")
		#  Display list element
		while (i < n) :
			print("  ", arr[i], end = "")
			i += 1
		
		print("\n Result :", end = "")
		i = 0
		#  Execute loop through by list size n
		while (i < n) :
			if (arr[i] in record.keys()) :
				#  increase element frequency
				record[arr[i]] = record.get(arr[i]) + 1
			else :
				#  Add new element
				record[arr[i]] = 1
			
			i += 1
		
		for key, value in record.items() :
			if ((value % 2) != 0) :
				print("  ", key, end = "")
				result = True
			
		if (result == False) :
			print(" None ")
		

def main() :
	task = Frequency()
	arr = [4, 6, 2, 8, 1, -2, 4, 2, 1, 1]
	#  Get the size of list
	n = len(arr) #  Test
	task.OddOccurrence(arr, n)

if __name__ == "__main__": main()

Output

Array Elements
   4   6   2   8   1   -2   4   2   1   1
 Result :   1   6   8   -2

#  Ruby Program
#  Find all odd frequency elements from an Array
class Frequency 
	def OddOccurrence(arr, n) 
		#  Use to count frequency
		record = Hash.new 
		#  result indicator
		result = false
		i = 0
		print("\nArray Elements\n")
		#  Display array element
		while (i < n) 
			print("  ", arr[i])
			i += 1
		end

		print("\n Result :")
		i = 0
		#  Execute loop through by array size n
		while (i < n) 
			if (record.key?(arr[i])) 
				record[arr[i]] = record[arr[i]] + 1
			else 
				record[arr[i]] = 1
			end

			i += 1
		end

		record.each { | key, value | 
			if ((value % 2) != 0) 
				print("  ", key)
				result = true
			end
		}
		if (result == false) 
			print(" None \n")
		end

	end

end

def main() 
	task = Frequency.new()
	arr = [4, 6, 2, 8, 1, -2, 4, 2, 1, 1]
	#  Get the size of array
	n = arr.length
	#  Test
	task.OddOccurrence(arr, n)
end

main()

Output

Array Elements
  4  6  2  8  1  -2  4  2  1  1
 Result :  6  8  1  -2

import scala.collection.mutable._;
// Scala Program
// Find all odd frequency elements from an Array
class Frequency
{
	def OddOccurrence(arr: Array[Int], n: Int): Unit = {
		// Use to count frequency
		var record = Map[Int, Int]();
		// result indicator
		var result: Boolean = false;
		var i: Int = 0;
		print("\nArray Elements\n");
		// Display array element
		while (i < n)
		{
			print("  " + arr(i));
			i += 1;
		}
		print("\n Result :");
		i = 0;
		// Execute loop through by array size n
		while (i < n)
		{
			if (record.contains(arr(i)))
			{
				// increase element frequency
				record.addOne(arr(i), record.get(arr(i)).get + 1);
			}
			else
			{
				// Add new element
				record.addOne(arr(i), 1);
			}
			i += 1;
		}
		for ((key, value) <- record)
		{
			if ((value % 2) != 0)
			{
				print("  " + key);
				result = true;
			}
		}
		if (result == false)
		{
			print(" None \n");
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: Frequency = new Frequency();
		var arr: Array[Int] = Array(4, 6, 2, 8, 1, -2, 4, 2, 1, 1);
		// Get the size of array
		var n: Int = arr.length;
		// Test
		task.OddOccurrence(arr, n);
	}
}

Output

Array Elements
  4  6  2  8  1  -2  4  2  1  1
 Result :  -2  1  6  8

import Foundation
// Swift 4 Program
// Find all odd frequency elements from an Array
class Frequency
{
	func OddOccurrence(_ arr: [Int], _ n: Int)
	{
		// Use to count frequency
		var record = [Int: Int]();
		// result indicator
		var result: Bool = false;
		var i: Int = 0;
		print("\nArray Elements");
		// Display array element
		while (i < n)
		{
			print("  ", arr[i], terminator: "");
			i += 1;
		}
		print("\n Result :", terminator: "");
		i = 0;
		// Execute loop through by array size n
		while (i < n)
		{
			if (record.keys.contains(arr[i]))
			{
				// increase element frequency
				record[arr[i]] = record[arr[i]]! + 1;
			}
			else
			{
				// Add new element
				record[arr[i]] = 1;
			}
			i += 1;
		}
		for (key, value) in record
		{
			if ((value % 2)  != 0)
			{
				print("  ", key, terminator: "");
				result = true;
			}
		}
		if (result == false)
		{
			print(" None ");
		}
	}
}
func main()
{
	let task: Frequency = Frequency();
	let arr: [Int] = [4, 6, 2, 8, 1, -2, 4, 2, 1, 1];
	// Get the size of array
	let n: Int = arr.count;
	// Test
	task.OddOccurrence(arr, n);
}
main();

Output

Array Elements
   4   6   2   8   1   -2   4   2   1   1
 Result :   6   -2   8   1

// Kotlin Program
// Find all odd frequency elements from an Array
class Frequency
{
	fun OddOccurrence(arr: Array < Int > , n: Int): Unit
	{
		// Use to count frequency
		var record = mutableMapOf < Int , Int > ();
		// result indicator
		var result: Boolean = false;
		var i: Int = 0;
		print("\nArray Elements\n");
		// Display array element
		while (i < n)
		{
			print("  " + arr[i]);
			i += 1;
		}
		print("\n Result :");
		i = 0;
		// Execute loop through by array size n
		while (i < n)
		{
			if (record.containsKey(arr[i]))
			{
				// increase element frequency
				record.put(arr[i], record.getValue(arr[i]) + 1);
			}
			else
			{
				// Add new element
				record.put(arr[i], 1);
			}
			i += 1;
		}
		// Finding odd occurrence element and sum of its elements
		for (key in record.keys)
		{
			if ((record.getValue(key) % 2) != 0)
			{
				print("  " + key);
				result = true;
			}
		}
		if (result == false)
		{
			print(" None \n");
		}
	}
}
fun main(args: Array < String > ): Unit
{
	var task: Frequency = Frequency();
	var arr: Array < Int > = arrayOf(4, 6, 2, 8, 1, -2, 4, 2, 1, 1);
	// Get the size of array
	var n: Int = arr.count();
	// Test
	task.OddOccurrence(arr, n);
}

Output

Array Elements
  4  6  2  8  1  -2  4  2  1  1
 Result :  6  8  1  -2

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