question: get the position list of an item concode_field_sep List<Short>[] listPositions concode_elem_sep int[] listItems concode_field_sep String toString concode_elem_sep void register
target: List < Short > function ( int arg0 ) { int loc0 = Arrays . binarySearch ( listItems , arg0 ) ; if ( loc0 < 0 ) { return null ; } return listPositions [ loc0 ] ; }