question: public void truncate ( int newsize ) { if ( newsize < size ) { double [ ] odists = dists ; dists = new double [ newsize ] ; System . arraycopy ( odists , 0 , dists , 0 , newsize ) ; int [ ] oids = ids ; ids = new int [ newsize ] ; System . arraycopy ( oids , 0 , ids , 0 , newsize ) ; size = newsize ; } }
target:  Truncate the list to the given size, freeing the memory.