/**
* Returns pre values.
*
* @param ids unique node ids
* @param off start offset
* @param len number of ids
* @return sorted pre values
*/
public final int[] pre(final int[] ids, final int off, final int len) {
if (meta.updindex) return idmap.pre(ids, off, len);
final IntList p = new IntList(ids.length);
for (int i = off; i < len; ++i) p.add(preold(ids[i]));
return p.sort().toArray();
}
/**
* Returns a pre value.
*
* @param id unique node id
* @return pre value or -1 if id was not found
*/
public final int pre(final int id) {
return meta.updindex ? idmap.pre(id) : preold(id);
}