Shell_Sort

class ShellSort
{
	static void printArray(int arr[])
	{
		int n = arr.length;
		for (int i=0; i<n; ++i)
			System.out.print(arr[i] + " ");
		System.out.println();
	}

	int sort(int arr[])
	{
		int n = arr.length;

		for (int gap = n/2; gap > 0; gap /= 2)
		{
			for (int i = gap; i < n; i += 1)
			{
				int temp = arr[i];

				int j;
				for (j = i; j >= gap && arr[j - gap] > temp; j -= gap)
					arr[j] = arr[j - gap];

				arr[j] = temp;
			}
		}
		return 0;
	}

	public static void main(String args[])
	{
		int arr[] = {12, 34, 54, 2, 3};
		System.out.println("Array before sorting");
		printArray(arr);

		ShellSort ob = new ShellSort();
		ob.sort(arr);

		System.out.println("Array after sorting");
		printArray(arr);
	}
}