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 public class ShellSort implements Sort {
 public static void main(String[] args) {
 int[] numbers = {34, 12, 23, 56, 56, 56, 78};
 ShellSort shellSort = new ShellSort();
 System.out.println("ShellSort");
 shellSort.sort(numbers);
 shellSort.print(numbers);
 
 }
 
 
 @Override
 public void sort(int[] arr) {
 int dk = arr.length / 2;
 while (dk >= 1) {
 ShellInsertSort(arr, dk);
 dk = dk / 2;
 }
 }
 
 private void ShellInsertSort(int[] a, int dk) {
 
 for (int i = dk; i < a.length; i++) {
 if (a[i] < a[i - dk]) {
 int j;
 int x = a[i];
 a[i] = a[i - dk];
 for (j = i - dk; j >= 0 && x < a[j]; j = j - dk) {
 
 a[j + dk] = a[j];
 }
 a[j + dk] = x;
 }
 }
 }
 
 }
 
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