nl: serialize tree using preorder dfs concode_field_sep int index concode_field_sep Node deserializeUtil concode_elem_sep String serializeLevelOrder concode_elem_sep void serializeUtil concode_elem_sep void main concode_elem_sep Node deserializeLevelOrder concode_elem_sep Node deserialize
code: String function ( Node arg0 ) { StringBuffer loc0 = new StringBuffer ( ) ; serializeUtil ( arg0 , loc0 ) ; return loc0 . toString ( ) ; }