Print k size combinations in given array

Here given code implementation process.

// C program for 
// Print k size combinations in given array 
#include <stdio.h>

// Recursively, printing the combination of given size
void combinations(char arr[], char result[], int n, int k, int i, int j)
{
	if (j == k)
	{
		// When k combination are found 
		// Print calculated combination
		for (int count = 0; count < k; ++count)
		{
			printf("  %c", result[count]);
		}
		printf("\n");
		return;
	}
	else if (i >= n)
	{
		// Stop recursion process when (i) is greater than or equal to given size
		return;
	}
	for (int count = i; count < n; ++count)
	{
		// Put new element
		result[j] = arr[count];
		// Recursively finding the solution
		combinations(arr, result, n, k, count + 1, j + 1);
	}
}
// Handles the request to print combinations of given array
void printCombinations(char arr[], int n, int k)
{
	if (k <= 0 || k > n || n <= 0)
	{
		return;
	}
	// auxiliary space to store result 
	char result[k];
	// Find combinations from left to right
	combinations(arr, result, n, k, 0, 0);
}
int main(int argc, char const *argv[])
{
	char arr[] = {
		'A' , 'B' , 'C' , 'D' , 'E'
	};
	// Get the length of array elements
	int n = sizeof(arr) / sizeof(arr[0]);
	// Here k = 3
	printCombinations(arr, n, 3);
	return 0;
}

input

  A  B  C
  A  B  D
  A  B  E
  A  C  D
  A  C  E
  A  D  E
  B  C  D
  B  C  E
  B  D  E
  C  D  E

/*
  Java Program for
  Print k size combinations in given array 
*/
public class Combinations
{
	// Recursively, printing the combination of given size
	public void findCombinations(char[] arr, char[] result, int n, int k, int i, int j)
	{
		if (j == k)
		{
			// When k combination are found 
			// Print calculated combination
			for (int count = 0; count < k; ++count)
			{
				System.out.print(" " + result[count]);
			}
			System.out.print("\n");
			return;
		}
		else if (i >= n)
		{
			// Stop recursion process when (i) is greater than or equal to given size
			return;
		}
		for (int count = i; count < n; ++count)
		{
			// Put new element
			result[j] = arr[count];
			// Recursively finding the solution
			findCombinations(arr, result, n, k, count + 1, j + 1);
		}
	}
	// Handles the request to print combinations of given array
	public void printCombinations(char[] arr, int n, int k)
	{
		if (k <= 0 || k > n || n <= 0)
		{
			return;
		}
		// auxiliary space to store result 
		char[] result = new char[k];
		// Find combinations from left to right
		findCombinations(arr, result, n, k, 0, 0);
	}
	public static void main(String[] args)
	{
		Combinations task = new Combinations();
		char[] arr = {
			'A' , 'B' , 'C' , 'D' , 'E'
		};
		// Get the length of array elements
		int n = arr.length;
		// Here k = 3
		task.printCombinations(arr, n, 3);
	}
}

input

 A B C
 A B D
 A B E
 A C D
 A C E
 A D E
 B C D
 B C E
 B D E
 C D E

// Include header file
#include <iostream>

using namespace std;
/*
  C++ Program for
  Print k size combinations in given array 
*/
class Combinations
{
	public:
		// Recursively, printing the combination of given size
		void findCombinations(char arr[], char result[], int n, int k, int i, int j)
		{
			if (j == k)
			{
				// When k combination are found 
				// Print calculated combination
				for (int count = 0; count < k; ++count)
				{
					cout << " " << result[count];
				}
				cout << "\n";
				return;
			}
			else
			{
				if (i >= n)
				{
					// Stop recursion process when (i) is greater than or equal to given size
					return;
				}
			}
			for (int count = i; count < n; ++count)
			{
				// Put new element
				result[j] = arr[count];
				// Recursively finding the solution
				this->findCombinations(arr, result, n, k, count + 1, j + 1);
			}
		}
	// Handles the request to print combinations of given array
	void printCombinations(char arr[], int n, int k)
	{
		if (k <= 0 || k > n || n <= 0)
		{
			return;
		}
		// auxiliary space to store result 
		char result[k];
		// Find combinations from left to right
		this->findCombinations(arr, result, n, k, 0, 0);
	}
};
int main()
{
	Combinations *task = new Combinations();
	char arr[] = {
		'A' , 'B' , 'C' , 'D' , 'E'
	};
	// Get the length of array elements
	int n = sizeof(arr) / sizeof(arr[0]);
	// Here k = 3
	task->printCombinations(arr, n, 3);
	return 0;
}

input

 A B C
 A B D
 A B E
 A C D
 A C E
 A D E
 B C D
 B C E
 B D E
 C D E

// Include namespace system
using System;
/*
  Csharp Program for
  Print k size combinations in given array 
*/
public class Combinations
{
	// Recursively, printing the combination of given size
	public void findCombinations(char[] arr, char[] result, int n, int k, int i, int j)
	{
		if (j == k)
		{
			// When k combination are found 
			// Print calculated combination
			for (int count = 0; count < k; ++count)
			{
				Console.Write(" " + result[count]);
			}
			Console.Write("\n");
			return;
		}
		else
		{
			if (i >= n)
			{
				// Stop recursion process when (i) is greater than or equal to given size
				return;
			}
		}
		for (int count = i; count < n; ++count)
		{
			// Put new element
			result[j] = arr[count];
			// Recursively finding the solution
			this.findCombinations(arr, result, n, k, count + 1, j + 1);
		}
	}
	// Handles the request to print combinations of given array
	public void printCombinations(char[] arr, int n, int k)
	{
		if (k <= 0 || k > n || n <= 0)
		{
			return;
		}
		// auxiliary space to store result 
		char[] result = new char[k];
		// Find combinations from left to right
		this.findCombinations(arr, result, n, k, 0, 0);
	}
	public static void Main(String[] args)
	{
		Combinations task = new Combinations();
		char[] arr = {
			'A' , 'B' , 'C' , 'D' , 'E'
		};
		// Get the length of array elements
		int n = arr.Length;
		// Here k = 3
		task.printCombinations(arr, n, 3);
	}
}

input

 A B C
 A B D
 A B E
 A C D
 A C E
 A D E
 B C D
 B C E
 B D E
 C D E

<?php
/*
  Php Program for
  Print k size combinations in given array 
*/
class Combinations
{
	// Recursively, printing the combination of given size
	public	function findCombinations($arr, $result, $n, $k, $i, $j)
	{
		if ($j == $k)
		{
			// When k combination are found 
			// Print calculated combination
			for ($count = 0; $count < $k; ++$count)
			{
				echo " ".$result[$count];
			}
			echo "\n";
			return;
		}
		else
		{
			if ($i >= $n)
			{
				// Stop recursion process when (i) is greater than or equal to given size
				return;
			}
		}
		for ($count = $i; $count < $n; ++$count)
		{
			// Put new element
			$result[$j] = $arr[$count];
			// Recursively finding the solution
			$this->findCombinations($arr, $result, $n, $k, $count + 1, $j + 1);
		}
	}
	// Handles the request to print combinations of given array
	public	function printCombinations($arr, $n, $k)
	{
		if ($k <= 0 || $k > $n || $n <= 0)
		{
			return;
		}
		// auxiliary space to store result 
		$result = array_fill(0, $k, ' ');
		// Find combinations from left to right
		$this->findCombinations($arr, $result, $n, $k, 0, 0);
	}
}

function main()
{
	$task = new Combinations();
	$arr = array('A', 'B', 'C', 'D', 'E');
	// Get the length of array elements
	$n = count($arr);
	// Here k = 3
	$task->printCombinations($arr, $n, 3);
}
main();

input

 A B C
 A B D
 A B E
 A C D
 A C E
 A D E
 B C D
 B C E
 B D E
 C D E

/*
  Node JS Program for
  Print k size combinations in given array 
*/
class Combinations
{
	// Recursively, printing the combination of given size
	findCombinations(arr, result, n, k, i, j)
	{
		if (j == k)
		{
			// When k combination are found 
			// Print calculated combination
			for (var count = 0; count < k; ++count)
			{
				process.stdout.write(" " + result[count]);
			}
			process.stdout.write("\n");
			return;
		}
		else
		{
			if (i >= n)
			{
				// Stop recursion process when (i) is greater than or equal to given size
				return;
			}
		}
		for (var count = i; count < n; ++count)
		{
			// Put new element
			result[j] = arr[count];
			// Recursively finding the solution
			this.findCombinations(arr, result, n, k, count + 1, j + 1);
		}
	}
	// Handles the request to print combinations of given array
	printCombinations(arr, n, k)
	{
		if (k <= 0 || k > n || n <= 0)
		{
			return;
		}
		// auxiliary space to store result 
		var result = Array(k).fill(' ');
		// Find combinations from left to right
		this.findCombinations(arr, result, n, k, 0, 0);
	}
}

function main()
{
	var task = new Combinations();
	var arr = ['A', 'B', 'C', 'D', 'E'];
	// Get the length of array elements
	var n = arr.length;
	// Here k = 3
	task.printCombinations(arr, n, 3);
}
main();

input

 A B C
 A B D
 A B E
 A C D
 A C E
 A D E
 B C D
 B C E
 B D E
 C D E

#  Python 3 Program for
#  Print k size combinations in given array 
class Combinations :
	#  Recursively, printing the combination of given size
	def findCombinations(self, arr, result, n, k, i, j) :
		if (j == k) :
			#  When k combination are found 
			#  Print calculated combination
			count = 0
			while (count < k) :
				print(" ", result[count], end = "")
				count += 1
			
			print(end = "\n")
			return
		else :
			if (i >= n) :
				#  Stop recursion process when (i) is greater than or equal to given size
				return
			
		
		count = i
		while (count < n) :
			#  Put new element
			result[j] = arr[count]
			#  Recursively finding the solution
			self.findCombinations(arr, result, n, k, count + 1, j + 1)
			count += 1
		
	
	#  Handles the request to print combinations of given list
	def printCombinations(self, arr, n, k) :
		if (k <= 0 or k > n or n <= 0) :
			return
		
		result = [ ' '
		] * (k)
		#  Find combinations from left to right
		self.findCombinations(arr, result, n, k, 0, 0)
	

def main() :
	task = Combinations()
	arr = ['A', 'B', 'C', 'D', 'E']
	n = len(arr)
	#  Here k = 3
	task.printCombinations(arr, n, 3)

if __name__ == "__main__": main()

input

  A  B  C
  A  B  D
  A  B  E
  A  C  D
  A  C  E
  A  D  E
  B  C  D
  B  C  E
  B  D  E
  C  D  E

#  Ruby Program for
#  Print k size combinations in given array 
class Combinations 
	#  Recursively, printing the combination of given size
	def findCombinations(arr, result, n, k, i, j) 
		if (j == k) 
			#  When k combination are found 
			#  Print calculated combination
			count = 0
			while (count < k) 
				print(" ", result[count])
				count += 1
			end

			print("\n")
			return
		else 
			if (i >= n) 
				#  Stop recursion process when (i) is greater than or equal to given size
				return
			end

		end

		count = i
		while (count < n) 
			#  Put new element
			result[j] = arr[count]
			#  Recursively finding the solution
			self.findCombinations(arr, result, n, k, count + 1, j + 1)
			count += 1
		end

	end

	#  Handles the request to print combinations of given array
	def printCombinations(arr, n, k) 
		if (k <= 0 || k > n || n <= 0) 
			return
		end

		#  auxiliary space to store result 
		result = Array.new(k) { ' '
		}
		#  Find combinations from left to right
		self.findCombinations(arr, result, n, k, 0, 0)
	end

end

def main() 
	task = Combinations.new()
	arr = ['A', 'B', 'C', 'D', 'E']
	#  Get the length of array elements
	n = arr.length
	#  Here k = 3
	task.printCombinations(arr, n, 3)
end

main()

input

 A B C
 A B D
 A B E
 A C D
 A C E
 A D E
 B C D
 B C E
 B D E
 C D E

/*
  Scala Program for
  Print k size combinations in given array 
*/
class Combinations()
{
	// Recursively, printing the combination of given size
	def findCombinations(arr: Array[Char], result: Array[Char], n: Int, k: Int, i: Int, j: Int): Unit = {
		if (j == k)
		{
			// When k combination are found 
			// Print calculated combination
			var count: Int = 0;
			while (count < k)
			{
				print(" " + result(count));
				count += 1;
			}
			print("\n");
			return;
		}
		else
		{
			if (i >= n)
			{
				// Stop recursion process when (i) is greater than or equal to given size
				return;
			}
		}
		var count: Int = i;
		while (count < n)
		{
			// Put new element
			result(j) = arr(count);
			// Recursively finding the solution
			findCombinations(arr, result, n, k, count + 1, j + 1);
			count += 1;
		}
	}
	// Handles the request to print combinations of given array
	def printCombinations(arr: Array[Char], n: Int, k: Int): Unit = {
		if (k <= 0 || k > n || n <= 0)
		{
			return;
		}
		// auxiliary space to store result 
		var result: Array[Char] = Array.fill[Char](k)(' ');
		// Find combinations from left to right
		findCombinations(arr, result, n, k, 0, 0);
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: Combinations = new Combinations();
		var arr: Array[Char] = Array('A', 'B', 'C', 'D', 'E');
		// Get the length of array elements
		var n: Int = arr.length;
		// Here k = 3
		task.printCombinations(arr, n, 3);
	}
}

input

 A B C
 A B D
 A B E
 A C D
 A C E
 A D E
 B C D
 B C E
 B D E
 C D E

/*
  Swift 4 Program for
  Print k size combinations in given array 
*/
class Combinations
{
	// Recursively, printing the combination of given size
	func findCombinations(_ arr: [Character], _ result: inout[Character], _ n: Int, _ k: Int, _ i: Int, _ j: Int)
	{
		if (j == k)
		{
			// When k combination are found 
			// Print calculated combination
			var count: Int = 0;
			while (count < k)
			{
				print(" ", result[count], terminator: "");
				count += 1;
			}
			print(terminator: "\n");
			return;
		}
		else
		{
			if (i >= n)
			{
				// Stop recursion process when (i) is greater than or equal to given size
				return;
			}
		}
		var count: Int = i;
		while (count < n)
		{
			// Put new element
			result[j] = arr[count];
			// Recursively finding the solution
			self.findCombinations(arr, &result, n, k, count + 1, j + 1);
			count += 1;
		}
	}
	// Handles the request to print combinations of given array
	func printCombinations(_ arr: [Character], _ n: Int, _ k: Int)
	{
		if (k <= 0 || k > n || n <= 0)
		{
			return;
		}
		// auxiliary space to store result 
		var result: [Character] = Array(repeating: " ", count: k);
		// Find combinations from left to right
		self.findCombinations(arr, &result, n, k, 0, 0);
	}
}
func main()
{
	let task: Combinations = Combinations();
	let arr: [Character] = ["A", "B", "C", "D", "E"];
	// Get the length of array elements
	let n: Int = arr.count;
	// Here k = 3
	task.printCombinations(arr, n, 3);
}
main();

input

  A  B  C
  A  B  D
  A  B  E
  A  C  D
  A  C  E
  A  D  E
  B  C  D
  B  C  E
  B  D  E
  C  D  E

/*
  Kotlin Program for
  Print k size combinations in given array 
*/
class Combinations
{
	// Recursively, printing the combination of given size
	fun findCombinations(arr: Array < Char > , result: Array < Char > , n: Int, k: Int, i: Int, j: Int): Unit
	{
		if (j == k)
		{
			var count: Int = 0;
			while (count < k)
			{
				print(" " + result[count]);
				count += 1;
			}
			print("\n");
			return;
		}
		else
		{
			if (i >= n)
			{
				// Stop recursion process when (i) is greater than or equal to given size
				return;
			}
		}
		var count: Int = i;
		while (count < n)
		{
			// Put new element
			result[j] = arr[count];
			// Recursively finding the solution
			this.findCombinations(arr, result, n, k, count + 1, j + 1);
			count += 1;
		}
	}
	// Handles the request to print combinations of given array
	fun printCombinations(arr: Array < Char > , n: Int, k: Int): Unit
	{
		if (k <= 0 || k > n || n <= 0)
		{
			return;
		}
		// auxiliary space to store result 
		val result: Array < Char > = Array(k)
		{
			' '
		};
		// Find combinations from left to right
		this.findCombinations(arr, result, n, k, 0, 0);
	}
}
fun main(args: Array < String > ): Unit
{
	val task: Combinations = Combinations();
	val arr: Array < Char > = arrayOf('A', 'B', 'C', 'D', 'E');
	// Get the length of array elements
	val n: Int = arr.count();
	// Here k = 3
	task.printCombinations(arr, n, 3);
}

input

 A B C
 A B D
 A B E
 A C D
 A C E
 A D E
 B C D
 B C E
 B D E
 C D E

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