void exch(int arr[], int i, int j)
{
	int temp = arr[i];
	arr[i] = arr[j];
	arr[j] = temp;
}

void bubble_sort(int arr[], int n)
{
	for(int i = n-1; i > 0; i--)
	{
		// Bubble larger elements to end of the array.
		for(int j = 0; j < i; j++)
		{
			if(arr[j] > arr[i]) exch(arr, i, j);
		}
	}
}