shell_sort.java

import java.util.Scanner;

public class shell_sort {
    public static void shellSort(int[] arr) {
        int n = arr.length;

        for (int gap = n / 2; gap > 0; gap /= 2) {
            for (int i = gap; i < n; i++) {
                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;
            }
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter the number of elements: ");
        int n = scanner.nextInt();
        int[] arr = new int[n];

        System.out.println("Enter " + n + " elements:");
        for (int i = 0; i < n; i++) {
            arr[i] = scanner.nextInt();
        }

        scanner.close();

        System.out.println("Original array: ");
        for (int num : arr) {
            System.out.print(num + " ");
        }

        shellSort(arr);

        System.out.println("\nSorted array: ");
        for (int num : arr) {
            System.out.print(num + " ");
        }
    }
}