Print all distinct combinations of sum x and n natural number

Here given code implementation process.

// C Program
// Print all distinct combinations of sum x and n natural number
#include <stdio.h>

// Display result
void printSequence(int result[], int k)
{
    for (int i = 0; i < k; ++i)
    {
        printf(" %d", result[i]);
    }
    printf("\n ");
}
void findCombination(int result[], int index, int sum, int x, int n)
{
    if (sum == x)
    {
        // Display calculated result
        printSequence(result, index);
        return;
    }
    if (sum > x || index >= x)
    {
        // Base case when stop process
        return;
    }
    for (int i = n; i >= 1; --i)
    {
        // Collect result value
        result[index] = i;
        findCombination(result, index + 1, sum + i, x, i);
    }
}
// Handles the request of find combination of given n and x
void combination(int x,int n)
{
    if (n <= 0 || x <= 0)
    {
        return;
    }
    printf("\n Given n : %d  x : %d \n ", n,x);
    // Collect result
    int result[x];
    // Test
    findCombination(result, 0, 0, x, n);
}
int main()
{   
  	// Test A
    // n = 3 means use [1,2,3]
    int n = 3;
    // Sum x = 10
    int x = 10;
    combination(x,n);
  	
  	// Test B
  	// n = 4 means use [1,2,3,4]
    n = 4;
    // Sum x = 12
    x = 12;
    combination(x,n);
  
  
    return 0;
}

Output

 Given n : 3  x : 10
  3 3 3 1
  3 3 2 2
  3 3 2 1 1
  3 3 1 1 1 1
  3 2 2 2 1
  3 2 2 1 1 1
  3 2 1 1 1 1 1
  3 1 1 1 1 1 1 1
  2 2 2 2 2
  2 2 2 2 1 1
  2 2 2 1 1 1 1
  2 2 1 1 1 1 1 1
  2 1 1 1 1 1 1 1 1
  1 1 1 1 1 1 1 1 1 1

 Given n : 4  x : 12
  4 4 4
  4 4 3 1
  4 4 2 2
  4 4 2 1 1
  4 4 1 1 1 1
  4 3 3 2
  4 3 3 1 1
  4 3 2 2 1
  4 3 2 1 1 1
  4 3 1 1 1 1 1
  4 2 2 2 2
  4 2 2 2 1 1
  4 2 2 1 1 1 1
  4 2 1 1 1 1 1 1
  4 1 1 1 1 1 1 1 1
  3 3 3 3
  3 3 3 2 1
  3 3 3 1 1 1
  3 3 2 2 2
  3 3 2 2 1 1
  3 3 2 1 1 1 1
  3 3 1 1 1 1 1 1
  3 2 2 2 2 1
  3 2 2 2 1 1 1
  3 2 2 1 1 1 1 1
  3 2 1 1 1 1 1 1 1
  3 1 1 1 1 1 1 1 1 1
  2 2 2 2 2 2
  2 2 2 2 2 1 1
  2 2 2 2 1 1 1 1
  2 2 2 1 1 1 1 1 1
  2 2 1 1 1 1 1 1 1 1
  2 1 1 1 1 1 1 1 1 1 1
  1 1 1 1 1 1 1 1 1 1 1 1

// Java Program for
// Print all distinct combinations of sum x and n natural number
public class SumCombination
{
	// Display result
	public void printSequence(int[] result, int k)
	{
		for (int i = 0; i < k; ++i)
		{
			System.out.print("  " + result[i]);
		}
		System.out.print("\n");
	}
	public void findCombination(int[] result, 
                                int index, 
                                int sum, 
                                int x, 
                                int n)
	{
		if (sum == x)
		{
			// Display calculated result
			printSequence(result, index);
			return;
		}
		if (sum > x || index >= x)
		{
			// Base case when stop process
			return;
		}
		for (int i = n; i >= 1; --i)
		{
			// Collect result value
			result[index] = i;
			findCombination(result, index + 1, sum + i, x, i);
		}
	}
	// Handles the request of find combination of given n and x
	public void combination(int x, int n)
	{
		if (n <= 0 || x <= 0)
		{
			return;
		}
		System.out.println("\n Given n : " + n + " x : " + x);
		// Collect result
		int[] result = new int[x];
		// Test
		findCombination(result, 0, 0, x, n);
	}
	public static void main(String[] args)
	{
		SumCombination task = new SumCombination();
		// Test A
		// n = 3 means use [1,2,3]
		int n = 3;
		// Sum x = 10
		int x = 10;
		task.combination(x, n);
		// Test B
		// n = 4 means use [1,2,3,4]
		n = 4;
		// Sum x = 12
		x = 12;
		task.combination(x, n);
	}
}

Output

 Given n : 3 x : 10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n : 4 x : 12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1
// Include header file
#include <iostream>

using namespace std;
// C++ Program for
// Print all distinct combinations of sum x and n natural number
class SumCombination
{
	public:
		// Display result
		void printSequence(int result[], int k)
		{
			for (int i = 0; i < k; ++i)
			{
				cout << "  " << result[i];
			}
			cout << "\n";
		}
	void findCombination(int result[], int index, int sum, int x, int n)
	{
		if (sum == x)
		{
			// Display calculated result
			this->printSequence(result, index);
			return;
		}
		if (sum > x || index >= x)
		{
			// Base case when stop process
			return;
		}
		for (int i = n; i >= 1; --i)
		{
			// Collect result value
			result[index] = i;
			this->findCombination(result, index + 1, sum + i, x, i);
		}
	}
	// Handles the request of find combination of given n and x
	void combination(int x, int n)
	{
		if (n <= 0 || x <= 0)
		{
			return;
		}
		cout << "\n Given n : " << n << " x : " << x << endl;
		// Collect result
		int result[x];
		// Test
		this->findCombination(result, 0, 0, x, n);
	}
};
int main()
{
	SumCombination *task = new SumCombination();
	// Test A
	// n = 3 means use [1,2,3]
	int n = 3;
	// Sum x = 10
	int x = 10;
	task->combination(x, n);
	// Test B
	// n = 4 means use [1,2,3,4]
	n = 4;
	// Sum x = 12
	x = 12;
	task->combination(x, n);
	return 0;
}

Output

 Given n : 3 x : 10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n : 4 x : 12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1
package main
import "fmt"
// Go Program for
// Print all distinct combinations of sum x and n natural number
type SumCombination struct {}
func getSumCombination() * SumCombination {
	var me *SumCombination = &SumCombination {}
	return me
}
// Display result
func(this SumCombination) printSequence(result[] int, k int) {
	for i := 0 ; i < k ; i++ {
		fmt.Print("  ", result[i])
	}
	fmt.Print("\n")
}
func(this SumCombination) findCombination(result[] int, 
                           index int, sum int, x int, n int) {
	if sum == x {
		// Display calculated result
		this.printSequence(result, index)
		return
	}
	if sum > x || index >= x {
		// Base case when stop process
		return
	}
	for i := n ; i >= 1 ; i-- {
		// Collect result value
		result[index] = i
		this.findCombination(result, index + 1, sum + i, x, i)
	}
}
// Handles the request of find combination of given n and x
func(this SumCombination) combination(x, n int) {
	if n <= 0 || x <= 0 {
		return
	}
	fmt.Println("\n Given n : ", n, " x : ", x)
	// Collect result
	var result = make([] int, x)
	// Test
	this.findCombination(result, 0, 0, x, n)
}
func main() {
	var task * SumCombination = getSumCombination()
	// Test A
	// n = 3 means use [1,2,3]
	var n int = 3
	// Sum x = 10
	var x int = 10
	task.combination(x, n)
	// Test B
	// n = 4 means use [1,2,3,4]
	n = 4
	// Sum x = 12
	x = 12
	task.combination(x, n)
}

Output

 Given n : 3 x : 10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n : 4 x : 12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1
// Include namespace system
using System;
// Csharp Program for
// Print all distinct combinations of sum x and n natural number
public class SumCombination
{
	// Display result
	public void printSequence(int[] result, int k)
	{
		for (int i = 0; i < k; ++i)
		{
			Console.Write("  " + result[i]);
		}
		Console.Write("\n");
	}
	public void findCombination(int[] result, 
                                int index, 
                                int sum, 
                                int x, 
                                int n)
	{
		if (sum == x)
		{
			// Display calculated result
			this.printSequence(result, index);
			return;
		}
		if (sum > x || index >= x)
		{
			// Base case when stop process
			return;
		}
		for (int i = n; i >= 1; --i)
		{
			// Collect result value
			result[index] = i;
			this.findCombination(result, index + 1, sum + i, x, i);
		}
	}
	// Handles the request of find combination of given n and x
	public void combination(int x, int n)
	{
		if (n <= 0 || x <= 0)
		{
			return;
		}
		Console.WriteLine("\n Given n : " + n + " x : " + x);
		// Collect result
		int[] result = new int[x];
		// Test
		this.findCombination(result, 0, 0, x, n);
	}
	public static void Main(String[] args)
	{
		SumCombination task = new SumCombination();
		// Test A
		// n = 3 means use [1,2,3]
		int n = 3;
		// Sum x = 10
		int x = 10;
		task.combination(x, n);
		// Test B
		// n = 4 means use [1,2,3,4]
		n = 4;
		// Sum x = 12
		x = 12;
		task.combination(x, n);
	}
}

Output

 Given n : 3 x : 10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n : 4 x : 12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1
<?php
// Php Program for
// Print all distinct combinations of sum x and n natural number
class SumCombination
{
	// Display result
	public	function printSequence($result, $k)
	{
		for ($i = 0; $i < $k; ++$i)
		{
			echo("  ".$result[$i]);
		}
		echo("\n");
	}
	public	function findCombination($result, $index, $sum, $x, $n)
	{
		if ($sum == $x)
		{
			// Display calculated result
			$this->printSequence($result, $index);
			return;
		}
		if ($sum > $x || $index >= $x)
		{
			// Base case when stop process
			return;
		}
		for ($i = $n; $i >= 1; --$i)
		{
			// Collect result value
			$result[$index] = $i;
			$this->findCombination($result, $index + 1, $sum + $i, $x, $i);
		}
	}
	// Handles the request of find combination of given n and x
	public	function combination($x, $n)
	{
		if ($n <= 0 || $x <= 0)
		{
			return;
		}
		echo("\n Given n : ".$n.
			" x : ".$x.
			"\n");
		// Collect result
		$result = array_fill(0, $x, 0);
		// Test
		$this->findCombination($result, 0, 0, $x, $n);
	}
}

function main()
{
	$task = new SumCombination();
	// Test A
	// n = 3 means use [1,2,3]
	$n = 3;
	// Sum x = 10
	$x = 10;
	$task->combination($x, $n);
	// Test B
	// n = 4 means use [1,2,3,4]
	$n = 4;
	// Sum x = 12
	$x = 12;
	$task->combination($x, $n);
}
main();

Output

 Given n : 3 x : 10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n : 4 x : 12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1
// Node JS Program for
// Print all distinct combinations of sum x and n natural number
class SumCombination
{
	// Display result
	printSequence(result, k)
	{
		for (var i = 0; i < k; ++i)
		{
			process.stdout.write("  " + result[i]);
		}
		process.stdout.write("\n");
	}
	findCombination(result, index, sum, x, n)
	{
		if (sum == x)
		{
			// Display calculated result
			this.printSequence(result, index);
			return;
		}
		if (sum > x || index >= x)
		{
			// Base case when stop process
			return;
		}
		for (var i = n; i >= 1; --i)
		{
			// Collect result value
			result[index] = i;
			this.findCombination(result, index + 1, sum + i, x, i);
		}
	}
	// Handles the request of find combination of given n and x
	combination(x, n)
	{
		if (n <= 0 || x <= 0)
		{
			return;
		}
		console.log("\n Given n : " + n + " x : " + x);
		// Collect result
		var result = Array(x).fill(0);
		// Test
		this.findCombination(result, 0, 0, x, n);
	}
}

function main()
{
	var task = new SumCombination();
	// Test A
	// n = 3 means use [1,2,3]
	var n = 3;
	// Sum x = 10
	var x = 10;
	task.combination(x, n);
	// Test B
	// n = 4 means use [1,2,3,4]
	n = 4;
	// Sum x = 12
	x = 12;
	task.combination(x, n);
}
main();

Output

 Given n : 3 x : 10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n : 4 x : 12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1
#  Python 3 Program for
#  Print all distinct combinations of sum x and n natural number
class SumCombination :
	#  Display result
	def printSequence(self, result, k) :
		i = 0
		while (i < k) :
			print(" ", result[i], end = "")
			i += 1
		
		print(end = "\n")
	
	def findCombination(self, result, index, sum, x, n) :
		if (sum == x) :
			#  Display calculated result
			self.printSequence(result, index)
			return
		
		if (sum > x or index >= x) :
			#  Base case when stop process
			return
		
		i = n
		while (i >= 1) :
			#  Collect result value
			result[index] = i
			self.findCombination(result, index + 1, sum + i, x, i)
			i -= 1
		
	
	#  Handles the request of find combination of given n and x
	def combination(self, x, n) :
		if (n <= 0 or x <= 0) :
			return
		
		print("\n Given n : ", n ," x : ", x)
		#  Collect result
		result = [0] * (x)
		#  Test
		self.findCombination(result, 0, 0, x, n)
	

def main() :
	task = SumCombination()
	#  Test A
	#  n = 3 means use [1,2,3]
	n = 3
	#  Sum x = 10
	x = 10
	task.combination(x, n)
	#  Test B
	#  n = 4 means use [1,2,3,4]
	n = 4
	#  Sum x = 12
	x = 12
	task.combination(x, n)

if __name__ == "__main__": main()

Output

 Given n :  3  x :  10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n :  4  x :  12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1
#  Ruby Program for
#  Print all distinct combinations of sum x and n natural number
class SumCombination 
	#  Display result
	def printSequence(result, k) 
		i = 0
		while (i < k) 
			print("  ", result[i])
			i += 1
		end

		print("\n")
	end

	def findCombination(result, index, sum, x, n) 
		if (sum == x) 
			#  Display calculated result
			self.printSequence(result, index)
			return
		end

		if (sum > x || index >= x) 
			#  Base case when stop process
			return
		end

		i = n
		while (i >= 1) 
			#  Collect result value
			result[index] = i
			self.findCombination(result, index + 1, sum + i, x, i)
			i -= 1
		end

	end

	#  Handles the request of find combination of given n and x
	def combination(x, n) 
		if (n <= 0 || x <= 0) 
			return
		end

		print("\n Given n : ", n ," x : ", x, "\n")
		#  Collect result
		result = Array.new(x) {0}
		#  Test
		self.findCombination(result, 0, 0, x, n)
	end

end

def main() 
	task = SumCombination.new()
	#  Test A
	#  n = 3 means use [1,2,3]
	n = 3
	#  Sum x = 10
	x = 10
	task.combination(x, n)
	#  Test B
	#  n = 4 means use [1,2,3,4]
	n = 4
	#  Sum x = 12
	x = 12
	task.combination(x, n)
end

main()

Output

 Given n : 3 x : 10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n : 4 x : 12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1

// Scala Program for
// Print all distinct combinations of sum x and n natural number
class SumCombination()
{
	// Display result
	def printSequence(result: Array[Int], k: Int): Unit = {
		var i: Int = 0;
		while (i < k)
		{
			print("  " + result(i));
			i += 1;
		}
		print("\n");
	}
	def findCombination(result: Array[Int], 
      index: Int, sum: Int, x: Int, n: Int): Unit = {
		if (sum == x)
		{
			// Display calculated result
			printSequence(result, index);
			return;
		}
		if (sum > x || index >= x)
		{
			// Base case when stop process
			return;
		}
		var i: Int = n;
		while (i >= 1)
		{
			// Collect result value
			result(index) = i;
			findCombination(result, index + 1, sum + i, x, i);
			i -= 1;
		}
	}
	// Handles the request of find combination of given n and x
	def combination(x: Int, n: Int): Unit = {
		if (n <= 0 || x <= 0)
		{
			return;
		}
		println("\n Given n : " + n + " x : " + x);
		// Collect result
		var result: Array[Int] = Array.fill[Int](x)(0);
		// Test
		findCombination(result, 0, 0, x, n);
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: SumCombination = new SumCombination();
		// Test A
		// n = 3 means use [1,2,3]
		var n: Int = 3;
		// Sum x = 10
		var x: Int = 10;
		task.combination(x, n);
		// Test B
		// n = 4 means use [1,2,3,4]
		n = 4;
		// Sum x = 12
		x = 12;
		task.combination(x, n);
	}
}

Output

 Given n : 3 x : 10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n : 4 x : 12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1
// Swift 4 Program for
// Print all distinct combinations of sum x and n natural number
class SumCombination
{
	// Display result
	func printSequence(_ result: [Int], _ k: Int)
	{
		var i: Int = 0;
		while (i < k)
		{
			print(" ", result[i], terminator: "");
			i += 1;
		}
		print(terminator: "\n");
	}
	func findCombination(_ result: inout[Int], 
      _ index: Int, _ sum: Int, _ x: Int, _ n: Int)
	{
		if (sum == x)
		{
			// Display calculated result
			self.printSequence(result, index);
			return;
		}
		if (sum > x || index >= x)
		{
			// Base case when stop process
			return;
		}
		var i: Int = n;
		while (i >= 1)
		{
			// Collect result value
			result[index] = i;
			self.findCombination(&result, index + 1, sum + i, x, i);
			i -= 1;
		}
	}
	// Handles the request of find combination of given n and x
	func combination(_ x: Int, _ n: Int)
	{
		if (n <= 0 || x <= 0)
		{
			return;
		}
		print("\n Given n : ", n ," x : ", x);
		// Collect result
		var result: [Int] = Array(repeating: 0, count: x);
		// Test
		self.findCombination(&result, 0, 0, x, n);
	}
}
func main()
{
	let task: SumCombination = SumCombination();
	// Test A
	// n = 3 means use [1,2,3]
	var n: Int = 3;
	// Sum x = 10
	var x: Int = 10;
	task.combination(x, n);
	// Test B
	// n = 4 means use [1,2,3,4]
	n = 4;
	// Sum x = 12
	x = 12;
	task.combination(x, n);
}
main();

Output

 Given n :  3  x :  10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n :  4  x :  12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1
// Kotlin Program for
// Print all distinct combinations of sum x and n natural number
class SumCombination
{
	// Display result
	fun printSequence(result: Array < Int > , k: Int): Unit
	{
		var i: Int = 0;
		while (i < k)
		{
			print("  " + result[i]);
			i += 1;
		}
		print("\n");
	}
	fun findCombination(result: Array < Int > , 
                        index: Int, sum: Int, 
                        x: Int, n: Int): Unit
	{
		if (sum == x)
		{
			// Display calculated result
			this.printSequence(result, index);
			return;
		}
		if (sum > x || index >= x)
		{
			// Base case when stop process
			return;
		}
		var i: Int = n;
		while (i >= 1)
		{
			// Collect result value
			result[index] = i;
			this.findCombination(result, index + 1, sum + i, x, i);
			i -= 1;
		}
	}
	// Handles the request of find combination of given n and x
	fun combination(x: Int, n: Int): Unit
	{
		if (n <= 0 || x <= 0)
		{
			return;
		}
		println("\n Given n : " + n + " x : " + x);
		// Collect result
		val result: Array < Int > = Array(x)
		{
			0
		};
		// Test
		this.findCombination(result, 0, 0, x, n);
	}
}
fun main(args: Array < String > ): Unit
{
	val task: SumCombination = SumCombination();
	// Test A
	// n = 3 means use [1,2,3]
	var n: Int = 3;
	// Sum x = 10
	var x: Int = 10;
	task.combination(x, n);
	// Test B
	// n = 4 means use [1,2,3,4]
	n = 4;
	// Sum x = 12
	x = 12;
	task.combination(x, n);
}

Output

 Given n : 3 x : 10
  3  3  3  1
  3  3  2  2
  3  3  2  1  1
  3  3  1  1  1  1
  3  2  2  2  1
  3  2  2  1  1  1
  3  2  1  1  1  1  1
  3  1  1  1  1  1  1  1
  2  2  2  2  2
  2  2  2  2  1  1
  2  2  2  1  1  1  1
  2  2  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1

 Given n : 4 x : 12
  4  4  4
  4  4  3  1
  4  4  2  2
  4  4  2  1  1
  4  4  1  1  1  1
  4  3  3  2
  4  3  3  1  1
  4  3  2  2  1
  4  3  2  1  1  1
  4  3  1  1  1  1  1
  4  2  2  2  2
  4  2  2  2  1  1
  4  2  2  1  1  1  1
  4  2  1  1  1  1  1  1
  4  1  1  1  1  1  1  1  1
  3  3  3  3
  3  3  3  2  1
  3  3  3  1  1  1
  3  3  2  2  2
  3  3  2  2  1  1
  3  3  2  1  1  1  1
  3  3  1  1  1  1  1  1
  3  2  2  2  2  1
  3  2  2  2  1  1  1
  3  2  2  1  1  1  1  1
  3  2  1  1  1  1  1  1  1
  3  1  1  1  1  1  1  1  1  1
  2  2  2  2  2  2
  2  2  2  2  2  1  1
  2  2  2  2  1  1  1  1
  2  2  2  1  1  1  1  1  1
  2  2  1  1  1  1  1  1  1  1
  2  1  1  1  1  1  1  1  1  1  1
  1  1  1  1  1  1  1  1  1  1  1  1


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