This person is already putting sets inside vectors, so I don't think they are worried about storage. But yes, you either need to stop occasionally and remove t

This person is already putting sets inside vectors, so I don't think they are worried about storage. But yes, you either need to stop occasionally and remove the duplicates or use a set, if the storage is prohibitive. Otherwise in terms of performance, sorting and unique is much faster than inserting one element at a time in a set.