text: #include "shell_sort.h"
  
  int main() {
  //    int arr[] = {21, 23, 43, 65, 32, 54, 78, 10, 82};
      int arr[] = {3, 7, 4, 6, 9, 1, 2};
      int len = sizeof(arr)/sizeof(int);
      print_arr(arr, len);
  
      printf("++++++++++ shell len=%d +++++++++\n", len);
  //     shell(arr, len, len/2);
  //     shell(arr, len, len/4);
  
      shell_sort(arr, len);
      print_arr(arr, len);
  
      return 0;
  }
  