Generate fixed bitonic sequence of n natural number

Here given code implementation process.

// C Program
// Generate fixed bitonic sequence of n natural number
#include <stdio.h>

void printResult(int result[], int n)
{
	for (int i = 0; i < n; ++i)
	{
		printf("  %d", result[i]);
	}
	printf("\n");
}
void sequence(int result[], int value, 
  			  int index, int flag, int n)
{
	if (index == n)
	{
		// Display result
		printResult(result, n);
	}
	else if (value > n || value < 1 || 
             (index > 0 && result[index - 1] == value) || 
             (index == n - 1 && value == n))
	{
		// When following conditions are occur
		// ➀  When value is greater than n  or  
		// ➁  When value is less than 1  or    
		// ➂  When consecutive elements are same  or
		// ➃  Last element is a nth natural number 
		return;
	}
	else
	{
		result[index] = value;
		if (flag == 1)
		{
			sequence(result, n, index + 1, 0, n);
			sequence(result, value + 1, index + 1, 1, n);
			sequence(result, value + 1, index, 1, n);
		}
		else
		{
			sequence(result, value - 1, index + 1, 0, n);
			sequence(result, value - 1, index, 0, n);
		}
	}
}
void findSequence(int n)
{
	if (n < 2)
	{
		return;
	}
	// Auxiliary array which is collect result
	int result[n];
	printf("\n  Given N : %d\n", n);
	sequence(result, 1, 0, 1, n);
}
int main(int argc, char
	const *argv[])
{
	int n = 3;
	/*
	    1  3  2
	    1  3  1
	    1  2  1
	    2  3  2
	    2  3  1
	    --------
	    Possible bitonic sequence
	*/
	findSequence(n);
	n = 5;
	findSequence(n);
	return 0;
}

Output

  Given N : 3
  1  3  2
  1  3  1
  1  2  1
  2  3  2
  2  3  1

  Given N : 5
  1  5  4  3  2
  1  5  4  3  1
  1  5  4  2  1
  1  5  3  2  1
  1  4  3  2  1
  1  2  5  4  3
  1  2  5  4  2
  1  2  5  4  1
  1  2  5  3  2
  1  2  5  3  1
  1  2  5  2  1
  1  2  4  3  2
  1  2  4  3  1
  1  2  4  2  1
  1  2  3  2  1
  1  2  3  5  4
  1  2  3  5  3
  1  2  3  5  2
  1  2  3  5  1
  1  2  3  4  3
  1  2  3  4  2
  1  2  3  4  1
  1  2  4  5  4
  1  2  4  5  3
  1  2  4  5  2
  1  2  4  5  1
  1  3  5  4  3
  1  3  5  4  2
  1  3  5  4  1
  1  3  5  3  2
  1  3  5  3  1
  1  3  5  2  1
  1  3  4  3  2
  1  3  4  3  1
  1  3  4  2  1
  1  3  4  5  4
  1  3  4  5  3
  1  3  4  5  2
  1  3  4  5  1
  1  4  5  4  3
  1  4  5  4  2
  1  4  5  4  1
  1  4  5  3  2
  1  4  5  3  1
  1  4  5  2  1
  2  5  4  3  2
  2  5  4  3  1
  2  5  4  2  1
  2  5  3  2  1
  2  4  3  2  1
  2  3  5  4  3
  2  3  5  4  2
  2  3  5  4  1
  2  3  5  3  2
  2  3  5  3  1
  2  3  5  2  1
  2  3  4  3  2
  2  3  4  3  1
  2  3  4  2  1
  2  3  4  5  4
  2  3  4  5  3
  2  3  4  5  2
  2  3  4  5  1
  2  4  5  4  3
  2  4  5  4  2
  2  4  5  4  1
  2  4  5  3  2
  2  4  5  3  1
  2  4  5  2  1
  3  5  4  3  2
  3  5  4  3  1
  3  5  4  2  1
  3  5  3  2  1
  3  4  3  2  1
  3  4  5  4  3
  3  4  5  4  2
  3  4  5  4  1
  3  4  5  3  2
  3  4  5  3  1
  3  4  5  2  1
  4  5  4  3  2
  4  5  4  3  1
  4  5  4  2  1
  4  5  3  2  1
// Java program for
// Generate fixed bitonic sequence of n natural number
public class Combination
{
	public void printResult(int[] result, int n)
	{
		for (int i = 0; i < n; ++i)
		{
			System.out.print(" " + result[i]);
		}
		System.out.print("\n");
	}
	public void sequence(int[] result, 
                         int value, 
                         int index, 
                         int flag, 
                         int n)
	{
		if (index == n)
		{
			// Display result
			printResult(result, n);
		}
		else if (value > n || value < 1 || 
                 (index > 0 && result[index - 1] == value) || 
                 (index == n - 1 && value == n))
		{
			// When following conditions are occur
			// ➀  When value is greater than n  or  
			// ➁  When value is less than 1  or    
			// ➂  When consecutive elements are same  or
			// ➃  Last element is a nth natural number 
			return;
		}
		else
		{
			result[index] = value;
			if (flag == 1)
			{
				sequence(result, n, index + 1, 0, n);
				sequence(result, value + 1, index + 1, 1, n);
				sequence(result, value + 1, index, 1, n);
			}
			else
			{
				sequence(result, value - 1, index + 1, 0, n);
				sequence(result, value - 1, index, 0, n);
			}
		}
	}
	public void findSequence(int n)
	{
		if (n < 2)
		{
			return;
		}
		// Auxiliary array which is collect result
		int[] result = new int[n];
		System.out.print("\n Given N : " + n + "\n");
		sequence(result, 1, 0, 1, n);
	}
	public static void main(String[] args)
	{
		Combination task = new Combination();
		int n = 3;
		/*
		    1  3  2
		    1  3  1
		    1  2  1
		    2  3  2
		    2  3  1
		    --------
		    Possible bitonic sequence
		*/
		task.findSequence(n);
		n = 5;
		task.findSequence(n);
	}
}

Output

 Given N : 3
 1 3 2
 1 3 1
 1 2 1
 2 3 2
 2 3 1

 Given N : 5
 1 5 4 3 2
 1 5 4 3 1
 1 5 4 2 1
 1 5 3 2 1
 1 4 3 2 1
 1 2 5 4 3
 1 2 5 4 2
 1 2 5 4 1
 1 2 5 3 2
 1 2 5 3 1
 1 2 5 2 1
 1 2 4 3 2
 1 2 4 3 1
 1 2 4 2 1
 1 2 3 2 1
 1 2 3 5 4
 1 2 3 5 3
 1 2 3 5 2
 1 2 3 5 1
 1 2 3 4 3
 1 2 3 4 2
 1 2 3 4 1
 1 2 4 5 4
 1 2 4 5 3
 1 2 4 5 2
 1 2 4 5 1
 1 3 5 4 3
 1 3 5 4 2
 1 3 5 4 1
 1 3 5 3 2
 1 3 5 3 1
 1 3 5 2 1
 1 3 4 3 2
 1 3 4 3 1
 1 3 4 2 1
 1 3 4 5 4
 1 3 4 5 3
 1 3 4 5 2
 1 3 4 5 1
 1 4 5 4 3
 1 4 5 4 2
 1 4 5 4 1
 1 4 5 3 2
 1 4 5 3 1
 1 4 5 2 1
 2 5 4 3 2
 2 5 4 3 1
 2 5 4 2 1
 2 5 3 2 1
 2 4 3 2 1
 2 3 5 4 3
 2 3 5 4 2
 2 3 5 4 1
 2 3 5 3 2
 2 3 5 3 1
 2 3 5 2 1
 2 3 4 3 2
 2 3 4 3 1
 2 3 4 2 1
 2 3 4 5 4
 2 3 4 5 3
 2 3 4 5 2
 2 3 4 5 1
 2 4 5 4 3
 2 4 5 4 2
 2 4 5 4 1
 2 4 5 3 2
 2 4 5 3 1
 2 4 5 2 1
 3 5 4 3 2
 3 5 4 3 1
 3 5 4 2 1
 3 5 3 2 1
 3 4 3 2 1
 3 4 5 4 3
 3 4 5 4 2
 3 4 5 4 1
 3 4 5 3 2
 3 4 5 3 1
 3 4 5 2 1
 4 5 4 3 2
 4 5 4 3 1
 4 5 4 2 1
 4 5 3 2 1
// Include header file
#include <iostream>

using namespace std;
// C++ program for
// Generate fixed bitonic sequence of n natural number
class Combination
{
	public: void printResult(int result[], int n)
	{
		for (int i = 0; i < n; ++i)
		{
			cout << " " << result[i];
		}
		cout << "\n";
	}
	void sequence(int result[], 
      int value, int index, 
        int flag, int n)
	{
		if (index == n)
		{
			// Display result
			this->printResult(result, n);
		}
		else if (value > n || value < 1 || 
                 (index > 0 && result[index - 1] == value) || 
                 (index == n - 1 && value == n))
		{
			// When following conditions are occur
			// ➀  When value is greater than n  or
			// ➁  When value is less than 1  or
			// ➂  When consecutive elements are same  or
			// ➃  Last element is a nth natural number
			return;
		}
		else
		{
			result[index] = value;
			if (flag == 1)
			{
				this->sequence(result, n, index + 1, 0, n);
				this->sequence(result, value + 1, index + 1, 1, n);
				this->sequence(result, value + 1, index, 1, n);
			}
			else
			{
				this->sequence(result, value - 1, index + 1, 0, n);
				this->sequence(result, value - 1, index, 0, n);
			}
		}
	}
	void findSequence(int n)
	{
		if (n < 2)
		{
			return;
		}
		// Auxiliary array which is collect result
		int result[n];
		cout << "\n Given N : " 
      		 << n << "\n";
		this->sequence(result, 1, 0, 1, n);
	}
};
int main()
{
	Combination *task = new Combination();
	int n = 3;
	/*
	    1  3  2
	    1  3  1
	    1  2  1
	    2  3  2
	    2  3  1
	    --------
	    Possible bitonic sequence
	*/
	task->findSequence(n);
	n = 5;
	task->findSequence(n);
	return 0;
}

Output

 Given N : 3
 1 3 2
 1 3 1
 1 2 1
 2 3 2
 2 3 1

 Given N : 5
 1 5 4 3 2
 1 5 4 3 1
 1 5 4 2 1
 1 5 3 2 1
 1 4 3 2 1
 1 2 5 4 3
 1 2 5 4 2
 1 2 5 4 1
 1 2 5 3 2
 1 2 5 3 1
 1 2 5 2 1
 1 2 4 3 2
 1 2 4 3 1
 1 2 4 2 1
 1 2 3 2 1
 1 2 3 5 4
 1 2 3 5 3
 1 2 3 5 2
 1 2 3 5 1
 1 2 3 4 3
 1 2 3 4 2
 1 2 3 4 1
 1 2 4 5 4
 1 2 4 5 3
 1 2 4 5 2
 1 2 4 5 1
 1 3 5 4 3
 1 3 5 4 2
 1 3 5 4 1
 1 3 5 3 2
 1 3 5 3 1
 1 3 5 2 1
 1 3 4 3 2
 1 3 4 3 1
 1 3 4 2 1
 1 3 4 5 4
 1 3 4 5 3
 1 3 4 5 2
 1 3 4 5 1
 1 4 5 4 3
 1 4 5 4 2
 1 4 5 4 1
 1 4 5 3 2
 1 4 5 3 1
 1 4 5 2 1
 2 5 4 3 2
 2 5 4 3 1
 2 5 4 2 1
 2 5 3 2 1
 2 4 3 2 1
 2 3 5 4 3
 2 3 5 4 2
 2 3 5 4 1
 2 3 5 3 2
 2 3 5 3 1
 2 3 5 2 1
 2 3 4 3 2
 2 3 4 3 1
 2 3 4 2 1
 2 3 4 5 4
 2 3 4 5 3
 2 3 4 5 2
 2 3 4 5 1
 2 4 5 4 3
 2 4 5 4 2
 2 4 5 4 1
 2 4 5 3 2
 2 4 5 3 1
 2 4 5 2 1
 3 5 4 3 2
 3 5 4 3 1
 3 5 4 2 1
 3 5 3 2 1
 3 4 3 2 1
 3 4 5 4 3
 3 4 5 4 2
 3 4 5 4 1
 3 4 5 3 2
 3 4 5 3 1
 3 4 5 2 1
 4 5 4 3 2
 4 5 4 3 1
 4 5 4 2 1
 4 5 3 2 1
// Include namespace system
using System;
// Csharp program for
// Generate fixed bitonic sequence of n natural number
public class Combination
{
	public void printResult(int[] result, int n)
	{
		for (int i = 0; i < n; ++i)
		{
			Console.Write(" " + result[i]);
		}
		Console.Write("\n");
	}
	public void sequence(int[] result, 
                         int value, 
                         int index, 
                         int flag, 
                         int n)
	{
		if (index == n)
		{
			// Display result
			this.printResult(result, n);
		}
		else if (value > n || value < 1 || 
                 (index > 0 && result[index - 1] == value) || 
                 (index == n - 1 && value == n))
		{
			// When following conditions are occur
			// ➀  When value is greater than n  or
			// ➁  When value is less than 1  or
			// ➂  When consecutive elements are same  or
			// ➃  Last element is a nth natural number
			return;
		}
		else
		{
			result[index] = value;
			if (flag == 1)
			{
				this.sequence(result, n, index + 1, 0, n);
				this.sequence(result, value + 1, index + 1, 1, n);
				this.sequence(result, value + 1, index, 1, n);
			}
			else
			{
				this.sequence(result, value - 1, index + 1, 0, n);
				this.sequence(result, value - 1, index, 0, n);
			}
		}
	}
	public void findSequence(int n)
	{
		if (n < 2)
		{
			return;
		}
		// Auxiliary array which is collect result
		int[] result = new int[n];
		Console.Write("\n Given N : " + n + "\n");
		this.sequence(result, 1, 0, 1, n);
	}
	public static void Main(String[] args)
	{
		Combination task = new Combination();
		int n = 3;
		/*
		    1  3  2
		    1  3  1
		    1  2  1
		    2  3  2
		    2  3  1
		    --------
		    Possible bitonic sequence
		*/
		task.findSequence(n);
		n = 5;
		task.findSequence(n);
	}
}

Output

 Given N : 3
 1 3 2
 1 3 1
 1 2 1
 2 3 2
 2 3 1

 Given N : 5
 1 5 4 3 2
 1 5 4 3 1
 1 5 4 2 1
 1 5 3 2 1
 1 4 3 2 1
 1 2 5 4 3
 1 2 5 4 2
 1 2 5 4 1
 1 2 5 3 2
 1 2 5 3 1
 1 2 5 2 1
 1 2 4 3 2
 1 2 4 3 1
 1 2 4 2 1
 1 2 3 2 1
 1 2 3 5 4
 1 2 3 5 3
 1 2 3 5 2
 1 2 3 5 1
 1 2 3 4 3
 1 2 3 4 2
 1 2 3 4 1
 1 2 4 5 4
 1 2 4 5 3
 1 2 4 5 2
 1 2 4 5 1
 1 3 5 4 3
 1 3 5 4 2
 1 3 5 4 1
 1 3 5 3 2
 1 3 5 3 1
 1 3 5 2 1
 1 3 4 3 2
 1 3 4 3 1
 1 3 4 2 1
 1 3 4 5 4
 1 3 4 5 3
 1 3 4 5 2
 1 3 4 5 1
 1 4 5 4 3
 1 4 5 4 2
 1 4 5 4 1
 1 4 5 3 2
 1 4 5 3 1
 1 4 5 2 1
 2 5 4 3 2
 2 5 4 3 1
 2 5 4 2 1
 2 5 3 2 1
 2 4 3 2 1
 2 3 5 4 3
 2 3 5 4 2
 2 3 5 4 1
 2 3 5 3 2
 2 3 5 3 1
 2 3 5 2 1
 2 3 4 3 2
 2 3 4 3 1
 2 3 4 2 1
 2 3 4 5 4
 2 3 4 5 3
 2 3 4 5 2
 2 3 4 5 1
 2 4 5 4 3
 2 4 5 4 2
 2 4 5 4 1
 2 4 5 3 2
 2 4 5 3 1
 2 4 5 2 1
 3 5 4 3 2
 3 5 4 3 1
 3 5 4 2 1
 3 5 3 2 1
 3 4 3 2 1
 3 4 5 4 3
 3 4 5 4 2
 3 4 5 4 1
 3 4 5 3 2
 3 4 5 3 1
 3 4 5 2 1
 4 5 4 3 2
 4 5 4 3 1
 4 5 4 2 1
 4 5 3 2 1
package main
import "fmt"
// Go program for
// Generate fixed bitonic sequence of n natural number
type Combination struct {}
func getCombination() * Combination {
	var me *Combination = &Combination {}
	return me
}
func(this Combination) printResult(result[] int, n int) {
	for i := 0 ; i < n ; i++ {
		fmt.Print(" ", result[i])
	}
	fmt.Print("\n")
}
func(this Combination) sequence(result[] int, 
	value int, index int, 
	flag int, n int) {
	if index == n {
		// Display result
		this.printResult(result, n)
	} else if value > n || value < 1 || 
	(index > 0 && result[index - 1] == value) || 
	(index == n - 1 && value == n) {
		// When following conditions are occur
		// ➀  When value is greater than n  or
		// ➁  When value is less than 1  or
		// ➂  When consecutive elements are same  or
		// ➃  Last element is a nth natural number
		return
	} else {
		result[index] = value
		if flag == 1 {
			this.sequence(result, n, index + 1, 0, n)
			this.sequence(result, value + 1, index + 1, 1, n)
			this.sequence(result, value + 1, index, 1, n)
		} else {
			this.sequence(result, value - 1, index + 1, 0, n)
			this.sequence(result, value - 1, index, 0, n)
		}
	}
}
func(this Combination) findSequence(n int) {
	if n < 2 {
		return
	}
	// Auxiliary array which is collect result
	var result = make([] int, n)
	fmt.Print("\n Given N : ", n, "\n")
	this.sequence(result, 1, 0, 1, n)
}
func main() {
	var task * Combination = getCombination()
	var n int = 3
	/*
	    1  3  2
	    1  3  1
	    1  2  1
	    2  3  2
	    2  3  1
	    --------
	    Possible bitonic sequence
	*/
	task.findSequence(n)
	n = 5
	task.findSequence(n)
}

Output

 Given N : 3
 1 3 2
 1 3 1
 1 2 1
 2 3 2
 2 3 1

 Given N : 5
 1 5 4 3 2
 1 5 4 3 1
 1 5 4 2 1
 1 5 3 2 1
 1 4 3 2 1
 1 2 5 4 3
 1 2 5 4 2
 1 2 5 4 1
 1 2 5 3 2
 1 2 5 3 1
 1 2 5 2 1
 1 2 4 3 2
 1 2 4 3 1
 1 2 4 2 1
 1 2 3 2 1
 1 2 3 5 4
 1 2 3 5 3
 1 2 3 5 2
 1 2 3 5 1
 1 2 3 4 3
 1 2 3 4 2
 1 2 3 4 1
 1 2 4 5 4
 1 2 4 5 3
 1 2 4 5 2
 1 2 4 5 1
 1 3 5 4 3
 1 3 5 4 2
 1 3 5 4 1
 1 3 5 3 2
 1 3 5 3 1
 1 3 5 2 1
 1 3 4 3 2
 1 3 4 3 1
 1 3 4 2 1
 1 3 4 5 4
 1 3 4 5 3
 1 3 4 5 2
 1 3 4 5 1
 1 4 5 4 3
 1 4 5 4 2
 1 4 5 4 1
 1 4 5 3 2
 1 4 5 3 1
 1 4 5 2 1
 2 5 4 3 2
 2 5 4 3 1
 2 5 4 2 1
 2 5 3 2 1
 2 4 3 2 1
 2 3 5 4 3
 2 3 5 4 2
 2 3 5 4 1
 2 3 5 3 2
 2 3 5 3 1
 2 3 5 2 1
 2 3 4 3 2
 2 3 4 3 1
 2 3 4 2 1
 2 3 4 5 4
 2 3 4 5 3
 2 3 4 5 2
 2 3 4 5 1
 2 4 5 4 3
 2 4 5 4 2
 2 4 5 4 1
 2 4 5 3 2
 2 4 5 3 1
 2 4 5 2 1
 3 5 4 3 2
 3 5 4 3 1
 3 5 4 2 1
 3 5 3 2 1
 3 4 3 2 1
 3 4 5 4 3
 3 4 5 4 2
 3 4 5 4 1
 3 4 5 3 2
 3 4 5 3 1
 3 4 5 2 1
 4 5 4 3 2
 4 5 4 3 1
 4 5 4 2 1
 4 5 3 2 1
<?php
// Php program for
// Generate fixed bitonic sequence of n natural number
class Combination
{
	public	function printResult($result, $n)
	{
		for ($i = 0; $i < $n; ++$i)
		{
			echo(" ".$result[$i]);
		}
		echo("\n");
	}
	public	function sequence($result, 
                               $value, 
                               $index, 
                               $flag, 
                               $n)
	{
		if ($index == $n)
		{
			// Display result
			$this->printResult($result, $n);
		}
		else if ($value > $n || $value < 1 || 
                 ($index > 0 && $result[$index - 1] == $value) || 
                 ($index == $n - 1 && $value == $n))
		{
			// When following conditions are occur
			// ➀  When value is greater than n  or
			// ➁  When value is less than 1  or
			// ➂  When consecutive elements are same  or
			// ➃  Last element is a nth natural number
			return;
		}
		else
		{
			$result[$index] = $value;
			if ($flag == 1)
			{
				$this->sequence($result, $n, $index + 1, 0, $n);
				$this->sequence($result, $value + 1, $index + 1, 1, $n);
				$this->sequence($result, $value + 1, $index, 1, $n);
			}
			else
			{
				$this->sequence($result, $value - 1, $index + 1, 0, $n);
				$this->sequence($result, $value - 1, $index, 0, $n);
			}
		}
	}
	public	function findSequence($n)
	{
		if ($n < 2)
		{
			return;
		}
		// Auxiliary array which is collect result
		$result = array_fill(0, $n, 0);
		echo("\n Given N : ".$n."\n");
		$this->sequence($result, 1, 0, 1, $n);
	}
}

function main()
{
	$task = new Combination();
	$n = 3;
	/*
	    1  3  2
	    1  3  1
	    1  2  1
	    2  3  2
	    2  3  1
	    --------
	    Possible bitonic sequence
	*/
	$task->findSequence($n);
	$n = 5;
	$task->findSequence($n);
}
main();

Output

 Given N : 3
 1 3 2
 1 3 1
 1 2 1
 2 3 2
 2 3 1

 Given N : 5
 1 5 4 3 2
 1 5 4 3 1
 1 5 4 2 1
 1 5 3 2 1
 1 4 3 2 1
 1 2 5 4 3
 1 2 5 4 2
 1 2 5 4 1
 1 2 5 3 2
 1 2 5 3 1
 1 2 5 2 1
 1 2 4 3 2
 1 2 4 3 1
 1 2 4 2 1
 1 2 3 2 1
 1 2 3 5 4
 1 2 3 5 3
 1 2 3 5 2
 1 2 3 5 1
 1 2 3 4 3
 1 2 3 4 2
 1 2 3 4 1
 1 2 4 5 4
 1 2 4 5 3
 1 2 4 5 2
 1 2 4 5 1
 1 3 5 4 3
 1 3 5 4 2
 1 3 5 4 1
 1 3 5 3 2
 1 3 5 3 1
 1 3 5 2 1
 1 3 4 3 2
 1 3 4 3 1
 1 3 4 2 1
 1 3 4 5 4
 1 3 4 5 3
 1 3 4 5 2
 1 3 4 5 1
 1 4 5 4 3
 1 4 5 4 2
 1 4 5 4 1
 1 4 5 3 2
 1 4 5 3 1
 1 4 5 2 1
 2 5 4 3 2
 2 5 4 3 1
 2 5 4 2 1
 2 5 3 2 1
 2 4 3 2 1
 2 3 5 4 3
 2 3 5 4 2
 2 3 5 4 1
 2 3 5 3 2
 2 3 5 3 1
 2 3 5 2 1
 2 3 4 3 2
 2 3 4 3 1
 2 3 4 2 1
 2 3 4 5 4
 2 3 4 5 3
 2 3 4 5 2
 2 3 4 5 1
 2 4 5 4 3
 2 4 5 4 2
 2 4 5 4 1
 2 4 5 3 2
 2 4 5 3 1
 2 4 5 2 1
 3 5 4 3 2
 3 5 4 3 1
 3 5 4 2 1
 3 5 3 2 1
 3 4 3 2 1
 3 4 5 4 3
 3 4 5 4 2
 3 4 5 4 1
 3 4 5 3 2
 3 4 5 3 1
 3 4 5 2 1
 4 5 4 3 2
 4 5 4 3 1
 4 5 4 2 1
 4 5 3 2 1
// Node JS program for
// Generate fixed bitonic sequence of n natural number
class Combination
{
	printResult(result, n)
	{
		for (var i = 0; i < n; ++i)
		{
			process.stdout.write(" " + result[i]);
		}
		process.stdout.write("\n");
	}
	sequence(result, value, index, flag, n)
	{
		if (index == n)
		{
			// Display result
			this.printResult(result, n);
		}
		else if (value > n || value < 1 || 
                 (index > 0 && result[index - 1] == value) || 
                 (index == n - 1 && value == n))
		{
			// When following conditions are occur
			// ➀  When value is greater than n  or
			// ➁  When value is less than 1  or
			// ➂  When consecutive elements are same  or
			// ➃  Last element is a nth natural number
			return;
		}
		else
		{
			result[index] = value;
			if (flag == 1)
			{
				this.sequence(result, n, index + 1, 0, n);
				this.sequence(result, value + 1, index + 1, 1, n);
				this.sequence(result, value + 1, index, 1, n);
			}
			else
			{
				this.sequence(result, value - 1, index + 1, 0, n);
				this.sequence(result, value - 1, index, 0, n);
			}
		}
	}
	findSequence(n)
	{
		if (n < 2)
		{
			return;
		}
		// Auxiliary array which is collect result
		var result = Array(n).fill(0);
		process.stdout.write("\n Given N : " + n + "\n");
		this.sequence(result, 1, 0, 1, n);
	}
}

function main()
{
	var task = new Combination();
	var n = 3;
	/*
	    1  3  2
	    1  3  1
	    1  2  1
	    2  3  2
	    2  3  1
	    --------
	    Possible bitonic sequence
	*/
	task.findSequence(n);
	n = 5;
	task.findSequence(n);
}
main();

Output

 Given N : 3
 1 3 2
 1 3 1
 1 2 1
 2 3 2
 2 3 1

 Given N : 5
 1 5 4 3 2
 1 5 4 3 1
 1 5 4 2 1
 1 5 3 2 1
 1 4 3 2 1
 1 2 5 4 3
 1 2 5 4 2
 1 2 5 4 1
 1 2 5 3 2
 1 2 5 3 1
 1 2 5 2 1
 1 2 4 3 2
 1 2 4 3 1
 1 2 4 2 1
 1 2 3 2 1
 1 2 3 5 4
 1 2 3 5 3
 1 2 3 5 2
 1 2 3 5 1
 1 2 3 4 3
 1 2 3 4 2
 1 2 3 4 1
 1 2 4 5 4
 1 2 4 5 3
 1 2 4 5 2
 1 2 4 5 1
 1 3 5 4 3
 1 3 5 4 2
 1 3 5 4 1
 1 3 5 3 2
 1 3 5 3 1
 1 3 5 2 1
 1 3 4 3 2
 1 3 4 3 1
 1 3 4 2 1
 1 3 4 5 4
 1 3 4 5 3
 1 3 4 5 2
 1 3 4 5 1
 1 4 5 4 3
 1 4 5 4 2
 1 4 5 4 1
 1 4 5 3 2
 1 4 5 3 1
 1 4 5 2 1
 2 5 4 3 2
 2 5 4 3 1
 2 5 4 2 1
 2 5 3 2 1
 2 4 3 2 1
 2 3 5 4 3
 2 3 5 4 2
 2 3 5 4 1
 2 3 5 3 2
 2 3 5 3 1
 2 3 5 2 1
 2 3 4 3 2
 2 3 4 3 1
 2 3 4 2 1
 2 3 4 5 4
 2 3 4 5 3
 2 3 4 5 2
 2 3 4 5 1
 2 4 5 4 3
 2 4 5 4 2
 2 4 5 4 1
 2 4 5 3 2
 2 4 5 3 1
 2 4 5 2 1
 3 5 4 3 2
 3 5 4 3 1
 3 5 4 2 1
 3 5 3 2 1
 3 4 3 2 1
 3 4 5 4 3
 3 4 5 4 2
 3 4 5 4 1
 3 4 5 3 2
 3 4 5 3 1
 3 4 5 2 1
 4 5 4 3 2
 4 5 4 3 1
 4 5 4 2 1
 4 5 3 2 1
#  Python 3 program for
#  Generate fixed bitonic sequence of n natural number
class Combination :
	def printResult(self, result, n) :
		i = 0
		while (i < n) :
			print(" ", result[i], end = "")
			i += 1
		
		print(end = "\n")
	
	def sequence(self, result, value, index, flag, n) :
		if (index == n) :
			#  Display result
			self.printResult(result, n)
		elif (value > n or value < 1 or 
              (index > 0 and result[index - 1] == value) or 
        (index == n - 1 and value == n)) :
			#  When following conditions are occur
			#  ➀  When value is greater than n  or
			#  ➁  When value is less than 1  or
			#  ➂  When consecutive elements are same  or
			#  ➃  Last element is a nth natural number
			return
		else :
			result[index] = value
			if (flag == 1) :
				self.sequence(result, n, index + 1, 0, n)
				self.sequence(result, value + 1, index + 1, 1, n)
				self.sequence(result, value + 1, index, 1, n)
			else :
				self.sequence(result, value - 1, index + 1, 0, n)
				self.sequence(result, value - 1, index, 0, n)
			
		
	
	def findSequence(self, n) :
		if (n < 2) :
			return
		
		#  Auxiliary list which is collect result
		result = [0] * (n)
		print("\n Given N : ", n )
		self.sequence(result, 1, 0, 1, n)
	

def main() :
	task = Combination()
	n = 3
	#    1  3  2
	#    1  3  1
	#    1  2  1
	#    2  3  2
	#    2  3  1
	#    --------
	#    Possible bitonic sequence
	task.findSequence(n)
	n = 5
	task.findSequence(n)

if __name__ == "__main__": main()

Output

 Given N :  3
  1  3  2
  1  3  1
  1  2  1
  2  3  2
  2  3  1

 Given N :  5
  1  5  4  3  2
  1  5  4  3  1
  1  5  4  2  1
  1  5  3  2  1
  1  4  3  2  1
  1  2  5  4  3
  1  2  5  4  2
  1  2  5  4  1
  1  2  5  3  2
  1  2  5  3  1
  1  2  5  2  1
  1  2  4  3  2
  1  2  4  3  1
  1  2  4  2  1
  1  2  3  2  1
  1  2  3  5  4
  1  2  3  5  3
  1  2  3  5  2
  1  2  3  5  1
  1  2  3  4  3
  1  2  3  4  2
  1  2  3  4  1
  1  2  4  5  4
  1  2  4  5  3
  1  2  4  5  2
  1  2  4  5  1
  1  3  5  4  3
  1  3  5  4  2
  1  3  5  4  1
  1  3  5  3  2
  1  3  5  3  1
  1  3  5  2  1
  1  3  4  3  2
  1  3  4  3  1
  1  3  4  2  1
  1  3  4  5  4
  1  3  4  5  3
  1  3  4  5  2
  1  3  4  5  1
  1  4  5  4  3
  1  4  5  4  2
  1  4  5  4  1
  1  4  5  3  2
  1  4  5  3  1
  1  4  5  2  1
  2  5  4  3  2
  2  5  4  3  1
  2  5  4  2  1
  2  5  3  2  1
  2  4  3  2  1
  2  3  5  4  3
  2  3  5  4  2
  2  3  5  4  1
  2  3  5  3  2
  2  3  5  3  1
  2  3  5  2  1
  2  3  4  3  2
  2  3  4  3  1
  2  3  4  2  1
  2  3  4  5  4
  2  3  4  5  3
  2  3  4  5  2
  2  3  4  5  1
  2  4  5  4  3
  2  4  5  4  2
  2  4  5  4  1
  2  4  5  3  2
  2  4  5  3  1
  2  4  5  2  1
  3  5  4  3  2
  3  5  4  3  1
  3  5  4  2  1
  3  5  3  2  1
  3  4  3  2  1
  3  4  5  4  3
  3  4  5  4  2
  3  4  5  4  1
  3  4  5  3  2
  3  4  5  3  1
  3  4  5  2  1
  4  5  4  3  2
  4  5  4  3  1
  4  5  4  2  1
  4  5  3  2  1
#  Ruby program for
#  Generate fixed bitonic sequence of n natural number
class Combination 
	def printResult(result, n) 
		i = 0
		while (i < n) 
			print(" ", result[i])
			i += 1
		end

		print("\n")
	end

	def sequence(result, value, index, flag, n) 
		if (index == n) 
			#  Display result
			self.printResult(result, n)
		elsif (value > n || value < 1 || 
               (index > 0 && result[index - 1] == value) || 
               (index == n - 1 && value == n)) 
			#  When following conditions are occur
			#  ➀  When value is greater than n  or
			#  ➁  When value is less than 1  or
			#  ➂  When consecutive elements are same  or
			#  ➃  Last element is a nth natural number
			return
		else
 
			result[index] = value
			if (flag == 1) 
				self.sequence(result, n, index + 1, 0, n)
				self.sequence(result, value + 1, index + 1, 1, n)
				self.sequence(result, value + 1, index, 1, n)
			else
 
				self.sequence(result, value - 1, index + 1, 0, n)
				self.sequence(result, value - 1, index, 0, n)
			end

		end

	end

	def findSequence(n) 
		if (n < 2) 
			return
		end

		#  Auxiliary array which is collect result
		result = Array.new(n) {0}
		print("\n Given N : ", n ,"\n")
		self.sequence(result, 1, 0, 1, n)
	end

end

def main() 
	task = Combination.new()
	n = 3
	#    1  3  2
	#    1  3  1
	#    1  2  1
	#    2  3  2
	#    2  3  1
	#    --------
	#    Possible bitonic sequence
	task.findSequence(n)
	n = 5
	task.findSequence(n)
end

main()

Output

 Given N : 3
 1 3 2
 1 3 1
 1 2 1
 2 3 2
 2 3 1

 Given N : 5
 1 5 4 3 2
 1 5 4 3 1
 1 5 4 2 1
 1 5 3 2 1
 1 4 3 2 1
 1 2 5 4 3
 1 2 5 4 2
 1 2 5 4 1
 1 2 5 3 2
 1 2 5 3 1
 1 2 5 2 1
 1 2 4 3 2
 1 2 4 3 1
 1 2 4 2 1
 1 2 3 2 1
 1 2 3 5 4
 1 2 3 5 3
 1 2 3 5 2
 1 2 3 5 1
 1 2 3 4 3
 1 2 3 4 2
 1 2 3 4 1
 1 2 4 5 4
 1 2 4 5 3
 1 2 4 5 2
 1 2 4 5 1
 1 3 5 4 3
 1 3 5 4 2
 1 3 5 4 1
 1 3 5 3 2
 1 3 5 3 1
 1 3 5 2 1
 1 3 4 3 2
 1 3 4 3 1
 1 3 4 2 1
 1 3 4 5 4
 1 3 4 5 3
 1 3 4 5 2
 1 3 4 5 1
 1 4 5 4 3
 1 4 5 4 2
 1 4 5 4 1
 1 4 5 3 2
 1 4 5 3 1
 1 4 5 2 1
 2 5 4 3 2
 2 5 4 3 1
 2 5 4 2 1
 2 5 3 2 1
 2 4 3 2 1
 2 3 5 4 3
 2 3 5 4 2
 2 3 5 4 1
 2 3 5 3 2
 2 3 5 3 1
 2 3 5 2 1
 2 3 4 3 2
 2 3 4 3 1
 2 3 4 2 1
 2 3 4 5 4
 2 3 4 5 3
 2 3 4 5 2
 2 3 4 5 1
 2 4 5 4 3
 2 4 5 4 2
 2 4 5 4 1
 2 4 5 3 2
 2 4 5 3 1
 2 4 5 2 1
 3 5 4 3 2
 3 5 4 3 1
 3 5 4 2 1
 3 5 3 2 1
 3 4 3 2 1
 3 4 5 4 3
 3 4 5 4 2
 3 4 5 4 1
 3 4 5 3 2
 3 4 5 3 1
 3 4 5 2 1
 4 5 4 3 2
 4 5 4 3 1
 4 5 4 2 1
 4 5 3 2 1
// Scala program for
// Generate fixed bitonic sequence of n natural number
class Combination()
{
	def printResult(result: Array[Int], n: Int): Unit = {
		var i: Int = 0;
		while (i < n)
		{
			print(" " + result(i));
			i += 1;
		}
		print("\n");
	}
	def sequence(result: Array[Int], 
      value: Int, index: Int, 
        flag: Int, n: Int): Unit = {
		if (index == n)
		{
			// Display result
			printResult(result, n);
		}
		else if (value > n || value < 1 || 
          (index > 0 && result(index - 1) == value) || 
            (index == n - 1 && value == n))
		{
			// When following conditions are occur
			// ➀  When value is greater than n  or
			// ➁  When value is less than 1  or
			// ➂  When consecutive elements are same  or
			// ➃  Last element is a nth natural number
			return;
		}
		else
		{
			result(index) = value;
			if (flag == 1)
			{
				sequence(result, n, index + 1, 0, n);
				sequence(result, value + 1, index + 1, 1, n);
				sequence(result, value + 1, index, 1, n);
			}
			else
			{
				sequence(result, value - 1, index + 1, 0, n);
				sequence(result, value - 1, index, 0, n);
			}
		}
	}
	def findSequence(n: Int): Unit = {
		if (n < 2)
		{
			return;
		}
		// Auxiliary array which is collect result
		var result: Array[Int] = Array.fill[Int](n)(0);
		print("\n Given N : " + n + "\n");
		sequence(result, 1, 0, 1, n);
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: Combination = new Combination();
		var n: Int = 3;
		/*
		    1  3  2
		    1  3  1
		    1  2  1
		    2  3  2
		    2  3  1
		    --------
		    Possible bitonic sequence
		*/
		task.findSequence(n);
		n = 5;
		task.findSequence(n);
	}
}

Output

 Given N : 3
 1 3 2
 1 3 1
 1 2 1
 2 3 2
 2 3 1

 Given N : 5
 1 5 4 3 2
 1 5 4 3 1
 1 5 4 2 1
 1 5 3 2 1
 1 4 3 2 1
 1 2 5 4 3
 1 2 5 4 2
 1 2 5 4 1
 1 2 5 3 2
 1 2 5 3 1
 1 2 5 2 1
 1 2 4 3 2
 1 2 4 3 1
 1 2 4 2 1
 1 2 3 2 1
 1 2 3 5 4
 1 2 3 5 3
 1 2 3 5 2
 1 2 3 5 1
 1 2 3 4 3
 1 2 3 4 2
 1 2 3 4 1
 1 2 4 5 4
 1 2 4 5 3
 1 2 4 5 2
 1 2 4 5 1
 1 3 5 4 3
 1 3 5 4 2
 1 3 5 4 1
 1 3 5 3 2
 1 3 5 3 1
 1 3 5 2 1
 1 3 4 3 2
 1 3 4 3 1
 1 3 4 2 1
 1 3 4 5 4
 1 3 4 5 3
 1 3 4 5 2
 1 3 4 5 1
 1 4 5 4 3
 1 4 5 4 2
 1 4 5 4 1
 1 4 5 3 2
 1 4 5 3 1
 1 4 5 2 1
 2 5 4 3 2
 2 5 4 3 1
 2 5 4 2 1
 2 5 3 2 1
 2 4 3 2 1
 2 3 5 4 3
 2 3 5 4 2
 2 3 5 4 1
 2 3 5 3 2
 2 3 5 3 1
 2 3 5 2 1
 2 3 4 3 2
 2 3 4 3 1
 2 3 4 2 1
 2 3 4 5 4
 2 3 4 5 3
 2 3 4 5 2
 2 3 4 5 1
 2 4 5 4 3
 2 4 5 4 2
 2 4 5 4 1
 2 4 5 3 2
 2 4 5 3 1
 2 4 5 2 1
 3 5 4 3 2
 3 5 4 3 1
 3 5 4 2 1
 3 5 3 2 1
 3 4 3 2 1
 3 4 5 4 3
 3 4 5 4 2
 3 4 5 4 1
 3 4 5 3 2
 3 4 5 3 1
 3 4 5 2 1
 4 5 4 3 2
 4 5 4 3 1
 4 5 4 2 1
 4 5 3 2 1
// Swift 4 program for
// Generate fixed bitonic sequence of n natural number
class Combination
{
	func printResult(_ result: [Int], _ n: Int)
	{
		var i: Int = 0;
		while (i < n)
		{
			print(" ", result[i], terminator: "");
			i += 1;
		}
		print(terminator: "\n");
	}
	func sequence(
      _ result: inout[Int], 
      _ value: Int, 
        _ index: Int, 
          _ flag: Int, 
            _ n: Int)
	{
		if (index == n)
		{
			// Display result
			self.printResult(result, n);
		}
		else if (value > n || value < 1 || 
                 (index > 0 && result[index - 1] == value) || 
                 (index == n - 1 && value == n))
		{
			// When following conditions are occur
			// ➀  When value is greater than n  or
			// ➁  When value is less than 1  or
			// ➂  When consecutive elements are same  or
			// ➃  Last element is a nth natural number
			return;
		}
		else
		{
			result[index] = value;
			if (flag == 1)
			{
				self.sequence(&result, n, index + 1, 0, n);
				self.sequence(&result, value + 1, index + 1, 1, n);
				self.sequence(&result, value + 1, index, 1, n);
			}
			else
			{
				self.sequence(&result, value - 1, index + 1, 0, n);
				self.sequence(&result, value - 1, index, 0, n);
			}
		}
	}
	func findSequence(_ n: Int)
	{
		if (n < 2)
		{
			return;
		}
		// Auxiliary array which is collect result
		var result: [Int] = Array(repeating: 0, count: n);
		print("\n Given N : ", n );
		self.sequence(&result, 1, 0, 1, n);
	}
}
func main()
{
	let task: Combination = Combination();
	var n: Int = 3;
	/*
	    1  3  2
	    1  3  1
	    1  2  1
	    2  3  2
	    2  3  1
	    --------
	    Possible bitonic sequence
	*/
	task.findSequence(n);
	n = 5;
	task.findSequence(n);
}
main();

Output

 Given N :  3
  1  3  2
  1  3  1
  1  2  1
  2  3  2
  2  3  1

 Given N :  5
  1  5  4  3  2
  1  5  4  3  1
  1  5  4  2  1
  1  5  3  2  1
  1  4  3  2  1
  1  2  5  4  3
  1  2  5  4  2
  1  2  5  4  1
  1  2  5  3  2
  1  2  5  3  1
  1  2  5  2  1
  1  2  4  3  2
  1  2  4  3  1
  1  2  4  2  1
  1  2  3  2  1
  1  2  3  5  4
  1  2  3  5  3
  1  2  3  5  2
  1  2  3  5  1
  1  2  3  4  3
  1  2  3  4  2
  1  2  3  4  1
  1  2  4  5  4
  1  2  4  5  3
  1  2  4  5  2
  1  2  4  5  1
  1  3  5  4  3
  1  3  5  4  2
  1  3  5  4  1
  1  3  5  3  2
  1  3  5  3  1
  1  3  5  2  1
  1  3  4  3  2
  1  3  4  3  1
  1  3  4  2  1
  1  3  4  5  4
  1  3  4  5  3
  1  3  4  5  2
  1  3  4  5  1
  1  4  5  4  3
  1  4  5  4  2
  1  4  5  4  1
  1  4  5  3  2
  1  4  5  3  1
  1  4  5  2  1
  2  5  4  3  2
  2  5  4  3  1
  2  5  4  2  1
  2  5  3  2  1
  2  4  3  2  1
  2  3  5  4  3
  2  3  5  4  2
  2  3  5  4  1
  2  3  5  3  2
  2  3  5  3  1
  2  3  5  2  1
  2  3  4  3  2
  2  3  4  3  1
  2  3  4  2  1
  2  3  4  5  4
  2  3  4  5  3
  2  3  4  5  2
  2  3  4  5  1
  2  4  5  4  3
  2  4  5  4  2
  2  4  5  4  1
  2  4  5  3  2
  2  4  5  3  1
  2  4  5  2  1
  3  5  4  3  2
  3  5  4  3  1
  3  5  4  2  1
  3  5  3  2  1
  3  4  3  2  1
  3  4  5  4  3
  3  4  5  4  2
  3  4  5  4  1
  3  4  5  3  2
  3  4  5  3  1
  3  4  5  2  1
  4  5  4  3  2
  4  5  4  3  1
  4  5  4  2  1
  4  5  3  2  1
// Kotlin program for
// Generate fixed bitonic sequence of n natural number
class Combination
{
	fun printResult(result: Array < Int > , n: Int): Unit
	{
		var i: Int = 0;
		while (i < n)
		{
			print(" " + result[i]);
			i += 1;
		}
		print("\n");
	}
	fun sequence(result: Array < Int > , 
                 value: Int, 
                 index: Int, 
                 flag: Int, 
                 n: Int): Unit
	{
		if (index == n)
		{
			// Display result
			this.printResult(result, n);
		}
		else if (value > n || value < 1 || 
                 (index > 0 && result[index - 1] == value) || 
                 (index == n - 1 && value == n))
		{
			// When following conditions are occur
			// ➀  When value is greater than n  or
			// ➁  When value is less than 1  or
			// ➂  When consecutive elements are same  or
			// ➃  Last element is a nth natural number
			return;
		}
		else
		{
			result[index] = value;
			if (flag == 1)
			{
				this.sequence(result, n, index + 1, 0, n);
				this.sequence(result, value + 1, index + 1, 1, n);
				this.sequence(result, value + 1, index, 1, n);
			}
			else
			{
				this.sequence(result, value - 1, index + 1, 0, n);
				this.sequence(result, value - 1, index, 0, n);
			}
		}
	}
	fun findSequence(n: Int): Unit
	{
		if (n < 2)
		{
			return;
		}
		// Auxiliary array which is collect result
		val result: Array < Int > = Array(n)
		{
			0
		};
		print("\n Given N : " + n + "\n");
		this.sequence(result, 1, 0, 1, n);
	}
}
fun main(args: Array < String > ): Unit
{
	val task: Combination = Combination();
	var n: Int = 3;
	/*
	    1  3  2
	    1  3  1
	    1  2  1
	    2  3  2
	    2  3  1
	    --------
	    Possible bitonic sequence
	*/
	task.findSequence(n);
	n = 5;
	task.findSequence(n);
}

Output

 Given N : 3
 1 3 2
 1 3 1
 1 2 1
 2 3 2
 2 3 1

 Given N : 5
 1 5 4 3 2
 1 5 4 3 1
 1 5 4 2 1
 1 5 3 2 1
 1 4 3 2 1
 1 2 5 4 3
 1 2 5 4 2
 1 2 5 4 1
 1 2 5 3 2
 1 2 5 3 1
 1 2 5 2 1
 1 2 4 3 2
 1 2 4 3 1
 1 2 4 2 1
 1 2 3 2 1
 1 2 3 5 4
 1 2 3 5 3
 1 2 3 5 2
 1 2 3 5 1
 1 2 3 4 3
 1 2 3 4 2
 1 2 3 4 1
 1 2 4 5 4
 1 2 4 5 3
 1 2 4 5 2
 1 2 4 5 1
 1 3 5 4 3
 1 3 5 4 2
 1 3 5 4 1
 1 3 5 3 2
 1 3 5 3 1
 1 3 5 2 1
 1 3 4 3 2
 1 3 4 3 1
 1 3 4 2 1
 1 3 4 5 4
 1 3 4 5 3
 1 3 4 5 2
 1 3 4 5 1
 1 4 5 4 3
 1 4 5 4 2
 1 4 5 4 1
 1 4 5 3 2
 1 4 5 3 1
 1 4 5 2 1
 2 5 4 3 2
 2 5 4 3 1
 2 5 4 2 1
 2 5 3 2 1
 2 4 3 2 1
 2 3 5 4 3
 2 3 5 4 2
 2 3 5 4 1
 2 3 5 3 2
 2 3 5 3 1
 2 3 5 2 1
 2 3 4 3 2
 2 3 4 3 1
 2 3 4 2 1
 2 3 4 5 4
 2 3 4 5 3
 2 3 4 5 2
 2 3 4 5 1
 2 4 5 4 3
 2 4 5 4 2
 2 4 5 4 1
 2 4 5 3 2
 2 4 5 3 1
 2 4 5 2 1
 3 5 4 3 2
 3 5 4 3 1
 3 5 4 2 1
 3 5 3 2 1
 3 4 3 2 1
 3 4 5 4 3
 3 4 5 4 2
 3 4 5 4 1
 3 4 5 3 2
 3 4 5 3 1
 3 4 5 2 1
 4 5 4 3 2
 4 5 4 3 1
 4 5 4 2 1
 4 5 3 2 1


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