TopKSelector<Integer> top = TopKSelector.least(4);
      top.offerAll(list);
      assertThat(top.topK()).containsExactly(1, 2, 3, 4).inOrder();
    }
  }

  public void testOfferedThreeK() {
    for (List<Integer> list : Collections2.permutations(Ints.asList(1, 2, 3, 4, 5, 6))) {
      TopKSelector<Integer> top = TopKSelector.least(2);
      top.offerAll(list);
      assertThat(top.topK()).containsExactly(1, 2).inOrder();
    }

      TopKSelector<Integer> top = TopKSelector.least(4);
      top.offerAll(list);
      assertThat(top.topK()).containsExactly(1, 2, 3, 4).inOrder();
    }
  }

  public void testOfferedThreeK() {
    for (List<Integer> list : Collections2.permutations(Ints.asList(1, 2, 3, 4, 5, 6))) {
      TopKSelector<Integer> top = TopKSelector.least(2);
      top.offerAll(list);
      assertThat(top.topK()).containsExactly(1, 2).inOrder();
    }

   * {@link Ordering#leastOf(Iterable, int)}, which provides a simpler API for that use case.
   */
  public void offerAll(Iterable<? extends T> elements) {
    offerAll(elements.iterator());
  }

  /**
   * Adds each member of {@code elements} as a candidate for the top {@code k} elements. This

      }
      list.trimToSize();
      return Collections.unmodifiableList(list);
    } else {
      TopKSelector<E> selector = TopKSelector.least(k, this);
      selector.offerAll(iterator);
      return selector.topK();
    }
  }

  /**
   * Returns the {@code k} greatest elements of the given iterable according to this ordering, in