*/
  public static <T extends @Nullable Object> TopKSelector<T> greatest(
      int k, Comparator<? super T> comparator) {
    return new TopKSelector<>(Ordering.from(comparator).reverse(), k);
  }

  private final int k;
  private final Comparator<? super T> comparator;

  /*
   * We are currently considering the elements in buffer in the range [0, bufferSize) as candidates