Count strictly decreasing subarrays

Here given code implementation process.

// C Program
// Count strictly decreasing subarrays
#include <stdio.h>

// Display given array elements
void printArr(int arr[], int n)
{
	for (int i = 0; i < n; ++i)
	{
		printf("  %d", arr[i]);
	}
	printf("\n");
}
void countDecreasingArr(int arr[], int n)
{
	int count = 0;
	int dp[n];
	// Set zero to all slot
	for (int i = 0; i < n; ++i)
	{
		dp[i] = 0;
	}
	for (int i = 1; i < n; ++i)
	{
		if (arr[i - 1] > arr[i])
		{
			// When decreasing subarray occurs
			dp[i] = dp[i - 1] + 1;
			// Add counter
			count += dp[i];
		}
	}
	printArr(arr, n);
	printf(" Decreasing subarrays : %d \n", count);
}
int main()
{
	//  Arrays
	int a[] = {
		1 , 2 , 1 , 0 , 2 , 1 , 6 , 4 , 2
	};
	int b[] = {
		2 , 4 , 6 , 7
	};
	int c[] = {
		5 , 5 , 2 , 4 , 6 , 7
	};
	// Get the size
	int l1 = sizeof(a) / sizeof(a[0]);
	int l2 = sizeof(b) / sizeof(b[0]);
	int l3 = sizeof(c) / sizeof(c[0]);
	// Test A
	// arr = [1,2,1,0,2,1,6,4,2]
	// --------------------------
	//  ➀  [2,1]
	//  ➁  [2,1,0]
	//  ➂  [1,0]
	//  ➃  [2,1]
	//  ➄  [6,4]
	//  ➅  [4,2]
	//  ➆  [6,4,2]
	// ---------------
	//  Total : 7
	countDecreasingArr(a, l1);
	// Test B
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//   No decreasing subarray
	// ---------------
	//  Total : 0
	countDecreasingArr(b, l2);
	// Test C
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//  ➀  [5,2]
	// ---------------
	//  Total : 1
	countDecreasingArr(c, l3);
	return 0;
}

Output

  1  2  1  0  2  1  6  4  2
 Decreasing subarrays : 7
  2  4  6  7
 Decreasing subarrays : 0
  5  5  2  4  6  7
 Decreasing subarrays : 1
/*
    Java Program
    Count strictly decreasing subarrays
*/
public class Subarrays
{
	// Display given array elements
	public void printArr(int[] arr, int n)
	{
		for (int i = 0; i < n; ++i)
		{
			System.out.print(" " + arr[i]);
		}
		System.out.print("\n");
	}
	public void countDecreasingArr(int[] arr, int n)
	{
		int count = 0;
		int[] dp = new int[n];
		// Set zero to all slot
		for (int i = 0; i < n; ++i)
		{
			dp[i] = 0;
		}
		for (int i = 1; i < n; ++i)
		{
			if (arr[i - 1] > arr[i])
			{
				// When decreasing subarray occurs
				dp[i] = dp[i - 1] + 1;
				// Add counter
				count += dp[i];
			}
		}
		printArr(arr, n);
		System.out.print(" Decreasing subarrays : " + count + " \n");
	}
	public static void main(String[] args)
	{
		Subarrays task = new Subarrays();
		int[] a = {
			1 , 2 , 1 , 0 , 2 , 1 , 6 , 4 , 2
		};
		int[] b = {
			2 , 4 , 6 , 7
		};
		int[] c = {
			5 , 5 , 2 , 4 , 6 , 7
		};
		// Get the size
		int l1 = a.length;
		int l2 = b.length;
		int l3 = c.length;
		// Test A
		// arr = [1,2,1,0,2,1,6,4,2]
		// --------------------------
		//  ➀  [2,1]
		//  ➁  [2,1,0]
		//  ➂  [1,0]
		//  ➃  [2,1]
		//  ➄  [6,4]
		//  ➅  [4,2]
		//  ➆  [6,4,2]
		// ---------------
		//  Total : 7
		task.countDecreasingArr(a, l1);
		// Test B
		// arr = [5,5,2,4,6,7]
		// --------------------------
		//   No decreasing subarray
		// ---------------
		//  Total : 0
		task.countDecreasingArr(b, l2);
		// Test C
		// arr = [5,5,2,4,6,7]
		// --------------------------
		//  ➀  [5,2]
		// ---------------
		//  Total : 1
		task.countDecreasingArr(c, l3);
	}
}

Output

 1 2 1 0 2 1 6 4 2
 Decreasing subarrays : 7
 2 4 6 7
 Decreasing subarrays : 0
 5 5 2 4 6 7
 Decreasing subarrays : 1
// Include header file
#include <iostream>
using namespace std;
/*
    C++ Program
    Count strictly decreasing subarrays
*/
class Subarrays
{
	public:
		// Display given array elements
		void printArr(int arr[], int n)
		{
			for (int i = 0; i < n; ++i)
			{
				cout << " " << arr[i];
			}
			cout << "\n";
		}
	void countDecreasingArr(int arr[], int n)
	{
		int count = 0;
		int dp[n];
		// Set zero to all slot
		for (int i = 0; i < n; ++i)
		{
			dp[i] = 0;
		}
		for (int i = 1; i < n; ++i)
		{
			if (arr[i - 1] > arr[i])
			{
				// When decreasing subarray occurs
				dp[i] = dp[i - 1] + 1;
				// Add counter
				count += dp[i];
			}
		}
		this->printArr(arr, n);
		cout << " Decreasing subarrays : " << count << " \n";
	}
};
int main()
{
	Subarrays *task = new Subarrays();
	int a[] = {
		1 , 2 , 1 , 0 , 2 , 1 , 6 , 4 , 2
	};
	int b[] = {
		2 , 4 , 6 , 7
	};
	int c[] = {
		5 , 5 , 2 , 4 , 6 , 7
	};
	// Get the size
	int l1 = sizeof(a) / sizeof(a[0]);
	int l2 = sizeof(b) / sizeof(b[0]);
	int l3 = sizeof(c) / sizeof(c[0]);
	// Test A
	// arr = [1,2,1,0,2,1,6,4,2]
	// --------------------------
	//  ➀  [2,1]
	//  ➁  [2,1,0]
	//  ➂  [1,0]
	//  ➃  [2,1]
	//  ➄  [6,4]
	//  ➅  [4,2]
	//  ➆  [6,4,2]
	// ---------------
	//  Total : 7
	task->countDecreasingArr(a, l1);
	// Test B
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//   No decreasing subarray
	// ---------------
	//  Total : 0
	task->countDecreasingArr(b, l2);
	// Test C
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//  ➀  [5,2]
	// ---------------
	//  Total : 1
	task->countDecreasingArr(c, l3);
	return 0;
}

Output

 1 2 1 0 2 1 6 4 2
 Decreasing subarrays : 7
 2 4 6 7
 Decreasing subarrays : 0
 5 5 2 4 6 7
 Decreasing subarrays : 1
// Include namespace system
using System;
/*
    Csharp Program
    Count strictly decreasing subarrays
*/
public class Subarrays
{
	// Display given array elements
	public void printArr(int[] arr, int n)
	{
		for (int i = 0; i < n; ++i)
		{
			Console.Write(" " + arr[i]);
		}
		Console.Write("\n");
	}
	public void countDecreasingArr(int[] arr, int n)
	{
		int count = 0;
		int[] dp = new int[n];
		// Set zero to all slot
		for (int i = 0; i < n; ++i)
		{
			dp[i] = 0;
		}
		for (int i = 1; i < n; ++i)
		{
			if (arr[i - 1] > arr[i])
			{
				// When decreasing subarray occurs
				dp[i] = dp[i - 1] + 1;
				// Add counter
				count += dp[i];
			}
		}
		this.printArr(arr, n);
		Console.Write(" Decreasing subarrays : " + count + " \n");
	}
	public static void Main(String[] args)
	{
		Subarrays task = new Subarrays();
		int[] a = {
			1 , 2 , 1 , 0 , 2 , 1 , 6 , 4 , 2
		};
		int[] b = {
			2 , 4 , 6 , 7
		};
		int[] c = {
			5 , 5 , 2 , 4 , 6 , 7
		};
		// Get the size
		int l1 = a.Length;
		int l2 = b.Length;
		int l3 = c.Length;
		// Test A
		// arr = [1,2,1,0,2,1,6,4,2]
		// --------------------------
		//  ➀  [2,1]
		//  ➁  [2,1,0]
		//  ➂  [1,0]
		//  ➃  [2,1]
		//  ➄  [6,4]
		//  ➅  [4,2]
		//  ➆  [6,4,2]
		// ---------------
		//  Total : 7
		task.countDecreasingArr(a, l1);
		// Test B
		// arr = [5,5,2,4,6,7]
		// --------------------------
		//   No decreasing subarray
		// ---------------
		//  Total : 0
		task.countDecreasingArr(b, l2);
		// Test C
		// arr = [5,5,2,4,6,7]
		// --------------------------
		//  ➀  [5,2]
		// ---------------
		//  Total : 1
		task.countDecreasingArr(c, l3);
	}
}

Output

 1 2 1 0 2 1 6 4 2
 Decreasing subarrays : 7
 2 4 6 7
 Decreasing subarrays : 0
 5 5 2 4 6 7
 Decreasing subarrays : 1
package main
import "fmt"
/*
    Go Program
    Count strictly decreasing subarrays
*/

// Display given array elements
func printArr(arr[] int, n int) {
	for i := 0 ; i < n ; i++ {
		fmt.Print(" ", arr[i])
	}
	fmt.Print("\n")
}
func countDecreasingArr(arr[] int, n int) {
	var count int = 0
	// Set zero to all slot
	var dp = make([] int, n)
	for i := 1 ; i < n ; i++ {
		if arr[i - 1] > arr[i] {
			// When decreasing subarray occurs
			dp[i] = dp[i - 1] + 1
			// Add counter
			count += dp[i]
		}
	}
	printArr(arr, n)
	fmt.Print(" Decreasing subarrays : ", count, " \n")
}
func main() {

	var a = [] int {
		1,
		2,
		1,
		0,
		2,
		1,
		6,
		4,
		2,
	}
	var b = [] int {
		2,
		4,
		6,
		7,
	}
	var c = [] int {
		5,
		5,
		2,
		4,
		6,
		7,
	}
	// Get the size
	var l1 int = len(a)
	var l2 int = len(b)
	var l3 int = len(c)
	// Test A
	// arr = [1,2,1,0,2,1,6,4,2]
	// --------------------------
	//  ➀  [2,1]
	//  ➁  [2,1,0]
	//  ➂  [1,0]
	//  ➃  [2,1]
	//  ➄  [6,4]
	//  ➅  [4,2]
	//  ➆  [6,4,2]
	// ---------------
	//  Total : 7
	countDecreasingArr(a, l1)
	// Test B
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//   No decreasing subarray
	// ---------------
	//  Total : 0
	countDecreasingArr(b, l2)
	// Test C
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//  ➀  [5,2]
	// ---------------
	//  Total : 1
	countDecreasingArr(c, l3)
}

Output

 1 2 1 0 2 1 6 4 2
 Decreasing subarrays : 7
 2 4 6 7
 Decreasing subarrays : 0
 5 5 2 4 6 7
 Decreasing subarrays : 1
<?php
/*
    Php Program
    Count strictly decreasing subarrays
*/
class Subarrays
{
	// Display given array elements
	public	function printArr($arr, $n)
	{
		for ($i = 0; $i < $n; ++$i)
		{
			echo(" ".$arr[$i]);
		}
		echo("\n");
	}
	public	function countDecreasingArr($arr, $n)
	{
		$count = 0;
		// Set zero to all slot
		$dp = array_fill(0, $n, 0);
		for ($i = 1; $i < $n; ++$i)
		{
			if ($arr[$i - 1] > $arr[$i])
			{
				// When decreasing subarray occurs
				$dp[$i] = $dp[$i - 1] + 1;
				// Add counter
				$count += $dp[$i];
			}
		}
		$this->printArr($arr, $n);
		echo(" Decreasing subarrays : ".$count." \n");
	}
}

function main()
{
	$task = new Subarrays();
	$a = array(1, 2, 1, 0, 2, 1, 6, 4, 2);
	$b = array(2, 4, 6, 7);
	$c = array(5, 5, 2, 4, 6, 7);
	// Get the size
	$l1 = count($a);
	$l2 = count($b);
	$l3 = count($c);
	// Test A
	// arr = [1,2,1,0,2,1,6,4,2]
	// --------------------------
	//  ➀  [2,1]
	//  ➁  [2,1,0]
	//  ➂  [1,0]
	//  ➃  [2,1]
	//  ➄  [6,4]
	//  ➅  [4,2]
	//  ➆  [6,4,2]
	// ---------------
	//  Total : 7
	$task->countDecreasingArr($a, $l1);
	// Test B
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//   No decreasing subarray
	// ---------------
	//  Total : 0
	$task->countDecreasingArr($b, $l2);
	// Test C
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//  ➀  [5,2]
	// ---------------
	//  Total : 1
	$task->countDecreasingArr($c, $l3);
}
main();

Output

 1 2 1 0 2 1 6 4 2
 Decreasing subarrays : 7
 2 4 6 7
 Decreasing subarrays : 0
 5 5 2 4 6 7
 Decreasing subarrays : 1
/*
    Node JS Program
    Count strictly decreasing subarrays
*/
class Subarrays
{
	// Display given array elements
	printArr(arr, n)
	{
		for (var i = 0; i < n; ++i)
		{
			process.stdout.write(" " + arr[i]);
		}
		process.stdout.write("\n");
	}
	countDecreasingArr(arr, n)
	{
		var count = 0;
		// Set zero to all slot
		var dp = Array(n).fill(0);
		for (var i = 1; i < n; ++i)
		{
			if (arr[i - 1] > arr[i])
			{
				// When decreasing subarray occurs
				dp[i] = dp[i - 1] + 1;
				// Add counter
				count += dp[i];
			}
		}
		this.printArr(arr, n);
		console.log(" Decreasing subarrays : " + count );
	}
}

function main()
{
	var task = new Subarrays();
	var a = [1, 2, 1, 0, 2, 1, 6, 4, 2];
	var b = [2, 4, 6, 7];
	var c = [5, 5, 2, 4, 6, 7];
	// Get the size
	var l1 = a.length;
	var l2 = b.length;
	var l3 = c.length;
	// Test A
	// arr = [1,2,1,0,2,1,6,4,2]
	// --------------------------
	//  ➀  [2,1]
	//  ➁  [2,1,0]
	//  ➂  [1,0]
	//  ➃  [2,1]
	//  ➄  [6,4]
	//  ➅  [4,2]
	//  ➆  [6,4,2]
	// ---------------
	//  Total : 7
	task.countDecreasingArr(a, l1);
	// Test B
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//   No decreasing subarray
	// ---------------
	//  Total : 0
	task.countDecreasingArr(b, l2);
	// Test C
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//  ➀  [5,2]
	// ---------------
	//  Total : 1
	task.countDecreasingArr(c, l3);
}
main();

Output

 1 2 1 0 2 1 6 4 2
 Decreasing subarrays : 7
 2 4 6 7
 Decreasing subarrays : 0
 5 5 2 4 6 7
 Decreasing subarrays : 1
#    Python 3 Program
#    Count strictly decreasing subarrays
class Subarrays :
	#  Display given list elements
	def printArr(self, arr, n) :
		i = 0
		while (i < n) :
			print(" ", arr[i], end = "")
			i += 1
		
		print(end = "\n")
	
	def countDecreasingArr(self, arr, n) :
		count = 0
		#  Set zero to all slot
		dp = [0] * (n)
		i = 1
		while (i < n) :
			if (arr[i - 1] > arr[i]) :
				#  When decreasing sublist occurs
				dp[i] = dp[i - 1] + 1
				#  Add counter
				count += dp[i]
			
			i += 1
		
		self.printArr(arr, n)
		print(" Decreasing subarrays : ", count ," ")
	

def main() :
	task = Subarrays()
	a = [1, 2, 1, 0, 2, 1, 6, 4, 2]
	b = [2, 4, 6, 7]
	c = [5, 5, 2, 4, 6, 7]
	#  Get the size
	l1 = len(a)
	l2 = len(b)
	l3 = len(c)
	#  Test A
	#  arr = [1,2,1,0,2,1,6,4,2]
	#  --------------------------
	#   ➀  [2,1]
	#   ➁  [2,1,0]
	#   ➂  [1,0]
	#   ➃  [2,1]
	#   ➄  [6,4]
	#   ➅  [4,2]
	#   ➆  [6,4,2]
	#  ---------------
	#   Total : 7
	task.countDecreasingArr(a, l1)
	#  Test B
	#  arr = [5,5,2,4,6,7]
	#  --------------------------
	#    No decreasing sublist
	#  ---------------
	#   Total : 0
	task.countDecreasingArr(b, l2)
	#  Test C
	#  arr = [5,5,2,4,6,7]
	#  --------------------------
	#   ➀  [5,2]
	#  ---------------
	#   Total : 1
	task.countDecreasingArr(c, l3)

if __name__ == "__main__": main()

Output

  1  2  1  0  2  1  6  4  2
 Decreasing subarrays :  7
  2  4  6  7
 Decreasing subarrays :  0
  5  5  2  4  6  7
 Decreasing subarrays :  1
#    Ruby Program
#    Count strictly decreasing subarrays
class Subarrays 
	#  Display given array elements
	def printArr(arr, n) 
		i = 0
		while (i < n) 
			print(" ", arr[i])
			i += 1
		end

		print("\n")
	end

	def countDecreasingArr(arr, n) 
		count = 0
		#  Set zero to all slot
		dp = Array.new(n) {0}
		i = 1
		while (i < n) 
			if (arr[i - 1] > arr[i]) 
				#  When decreasing subarray occurs
				dp[i] = dp[i - 1] + 1
				#  Add counter
				count += dp[i]
			end

			i += 1
		end

		self.printArr(arr, n)
		print(" Decreasing subarrays : ", count ," \n")
	end

end

def main() 
	task = Subarrays.new()
	a = [1, 2, 1, 0, 2, 1, 6, 4, 2]
	b = [2, 4, 6, 7]
	c = [5, 5, 2, 4, 6, 7]
	#  Get the size
	l1 = a.length
	l2 = b.length
	l3 = c.length
	#  Test A
	#  arr = [1,2,1,0,2,1,6,4,2]
	#  --------------------------
	#   ➀  [2,1]
	#   ➁  [2,1,0]
	#   ➂  [1,0]
	#   ➃  [2,1]
	#   ➄  [6,4]
	#   ➅  [4,2]
	#   ➆  [6,4,2]
	#  ---------------
	#   Total : 7
	task.countDecreasingArr(a, l1)
	#  Test B
	#  arr = [5,5,2,4,6,7]
	#  --------------------------
	#    No decreasing subarray
	#  ---------------
	#   Total : 0
	task.countDecreasingArr(b, l2)
	#  Test C
	#  arr = [5,5,2,4,6,7]
	#  --------------------------
	#   ➀  [5,2]
	#  ---------------
	#   Total : 1
	task.countDecreasingArr(c, l3)
end

main()

Output

 1 2 1 0 2 1 6 4 2
 Decreasing subarrays : 7 
 2 4 6 7
 Decreasing subarrays : 0 
 5 5 2 4 6 7
 Decreasing subarrays : 1 
/*
    Scala Program
    Count strictly decreasing subarrays
*/
class Subarrays()
{
	// Display given array elements
	def printArr(arr: Array[Int], n: Int): Unit = {
		var i: Int = 0;
		while (i < n)
		{
			print(" " + arr(i));
			i += 1;
		}
		print("\n");
	}
	def countDecreasingArr(arr: Array[Int], n: Int): Unit = {
		var count: Int = 0;
		// Set zero to all slot
		var dp: Array[Int] = Array.fill[Int](n)(0);
		var i: Int = 1;
		while (i < n)
		{
			if (arr(i - 1) > arr(i))
			{
				// When decreasing subarray occurs
				dp(i) = dp(i - 1) + 1;
				// Add counter
				count += dp(i);
			}
			i += 1;
		}
		printArr(arr, n);
		print(" Decreasing subarrays : " + count + " \n");
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: Subarrays = new Subarrays();
		var a: Array[Int] = Array(1, 2, 1, 0, 2, 1, 6, 4, 2);
		var b: Array[Int] = Array(2, 4, 6, 7);
		var c: Array[Int] = Array(5, 5, 2, 4, 6, 7);
		// Get the size
		var l1: Int = a.length;
		var l2: Int = b.length;
		var l3: Int = c.length;
		// Test A
		// arr = [1,2,1,0,2,1,6,4,2]
		// --------------------------
		//  ➀  [2,1]
		//  ➁  [2,1,0]
		//  ➂  [1,0]
		//  ➃  [2,1]
		//  ➄  [6,4]
		//  ➅  [4,2]
		//  ➆  [6,4,2]
		// ---------------
		//  Total : 7
		task.countDecreasingArr(a, l1);
		// Test B
		// arr = [5,5,2,4,6,7]
		// --------------------------
		//   No decreasing subarray
		// ---------------
		//  Total : 0
		task.countDecreasingArr(b, l2);
		// Test C
		// arr = [5,5,2,4,6,7]
		// --------------------------
		//  ➀  [5,2]
		// ---------------
		//  Total : 1
		task.countDecreasingArr(c, l3);
	}
}

Output

 1 2 1 0 2 1 6 4 2
 Decreasing subarrays : 7
 2 4 6 7
 Decreasing subarrays : 0
 5 5 2 4 6 7
 Decreasing subarrays : 1
import Foundation;
/*
    Swift 4 Program
    Count strictly decreasing subarrays
*/
class Subarrays
{
	// Display given array elements
	func printArr(_ arr: [Int], _ n: Int)
	{
		var i: Int = 0;
		while (i < n)
		{
			print(" ", arr[i], terminator: "");
			i += 1;
		}
		print(terminator: "\n");
	}
	func countDecreasingArr(_ arr: [Int], _ n: Int)
	{
		var count: Int = 0;
		// Set zero to all slot
		var dp: [Int] = Array(repeating: 0, count: n);
		var i: Int = 1;
		while (i < n)
		{
			if (arr[i - 1] > arr[i])
			{
				// When decreasing subarray occurs
				dp[i] = dp[i - 1] + 1;
				// Add counter
				count += dp[i];
			}
			i += 1;
		}
		self.printArr(arr, n);
		print(" Decreasing subarrays : ", count ," ");
	}
}
func main()
{
	let task: Subarrays = Subarrays();
	let a: [Int] = [1, 2, 1, 0, 2, 1, 6, 4, 2];
	let b: [Int] = [2, 4, 6, 7];
	let c: [Int] = [5, 5, 2, 4, 6, 7];
	// Get the size
	let l1: Int = a.count;
	let l2: Int = b.count;
	let l3: Int = c.count;
	// Test A
	// arr = [1,2,1,0,2,1,6,4,2]
	// --------------------------
	//  ➀  [2,1]
	//  ➁  [2,1,0]
	//  ➂  [1,0]
	//  ➃  [2,1]
	//  ➄  [6,4]
	//  ➅  [4,2]
	//  ➆  [6,4,2]
	// ---------------
	//  Total : 7
	task.countDecreasingArr(a, l1);
	// Test B
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//   No decreasing subarray
	// ---------------
	//  Total : 0
	task.countDecreasingArr(b, l2);
	// Test C
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//  ➀  [5,2]
	// ---------------
	//  Total : 1
	task.countDecreasingArr(c, l3);
}
main();

Output

  1  2  1  0  2  1  6  4  2
 Decreasing subarrays :  7
  2  4  6  7
 Decreasing subarrays :  0
  5  5  2  4  6  7
 Decreasing subarrays :  1
/*
    Kotlin Program
    Count strictly decreasing subarrays
*/
class Subarrays
{
	// Display given array elements
	fun printArr(arr: Array < Int > , n: Int): Unit
	{
		var i: Int = 0;
		while (i < n)
		{
			print(" " + arr[i]);
			i += 1;
		}
		print("\n");
	}
	fun countDecreasingArr(arr: Array < Int > , n: Int): Unit
	{
		var count: Int = 0;
		// Set zero to all slot
		val dp: Array < Int > = Array(n)
		{
			0
		};
		var i: Int = 1;
		while (i < n)
		{
			if (arr[i - 1] > arr[i])
			{
				// When decreasing subarray occurs
				dp[i] = dp[i - 1] + 1;
				// Add counter
				count += dp[i];
			}
			i += 1;
		}
		this.printArr(arr, n);
		print(" Decreasing subarrays : " + count + " \n");
	}
}
fun main(args: Array < String > ): Unit
{
	val task: Subarrays = Subarrays();
	val a: Array < Int > = arrayOf(1, 2, 1, 0, 2, 1, 6, 4, 2);
	val b: Array < Int > = arrayOf(2, 4, 6, 7);
	val c: Array < Int > = arrayOf(5, 5, 2, 4, 6, 7);
	// Get the size
	val l1: Int = a.count();
	val l2: Int = b.count();
	val l3: Int = c.count();
	// Test A
	// arr = [1,2,1,0,2,1,6,4,2]
	// --------------------------
	//  ➀  [2,1]
	//  ➁  [2,1,0]
	//  ➂  [1,0]
	//  ➃  [2,1]
	//  ➄  [6,4]
	//  ➅  [4,2]
	//  ➆  [6,4,2]
	// ---------------
	//  Total : 7
	task.countDecreasingArr(a, l1);
	// Test B
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//   No decreasing subarray
	// ---------------
	//  Total : 0
	task.countDecreasingArr(b, l2);
	// Test C
	// arr = [5,5,2,4,6,7]
	// --------------------------
	//  ➀  [5,2]
	// ---------------
	//  Total : 1
	task.countDecreasingArr(c, l3);
}

Output

 1 2 1 0 2 1 6 4 2
 Decreasing subarrays : 7
 2 4 6 7
 Decreasing subarrays : 0
 5 5 2 4 6 7
 Decreasing subarrays : 1


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