CSC 1351 permutations lab

    @Override
    public int[][] permutation(int[] arr) {
        int n = arr.length;
        int[][] result = new int[fac(n)][n];
         int[][] ires;
        if (result.length == 1)
            result[0] = arr;

        else
      {

          for (int i = 0; i < arr.length; i++)
          {
              int[] sm = remove(arr, i);
              ires = permutation(sm);
              for (int[] ire : ires) {
                  result[i] = append(ire, arr[i]);

              }
          }
      }

        return result;


    }