docs: protected static <O> DoubleIntPair[] rankReferencePoints(DistanceQuery<O> distanceQuery, O obj, ArrayDBIDs referencepoints) {
      DoubleIntPair[] priority = new DoubleIntPair[referencepoints.size()];
      // Compute distances to reference points.
      for(DBIDArrayIter iter = referencepoints.iter(); iter.valid(); iter.advance()) {
        final int i = iter.getOffset();
        final double dist = distanceQuery.distance(obj, iter);
        priority[i] = new DoubleIntPair(dist, i);
      }
      Arrays.sort(priority);
      return priority;
    }