static String getSubSeq ( String s , int n ) {
  String res = "" ;
  int cr = 0 ;
  while ( cr < n ) {
    char mx = s . charAt ( cr ) ;
    for ( int i = cr + 1 ;
    i < n ;
    i ++ ) {
      mx = ( char ) Math . max ( mx , s . charAt ( i ) ) ;
    }
    int lst = cr ;
    for ( int i = cr ;
    i < n ;
    i ++ ) {
      if ( s . charAt ( i ) == mx ) {
        res += s . charAt ( i ) ;
        lst = i ;
      }
    }
    cr = lst + 1 ;
  }
  return res ;
}

static String getSubSeq ( String s , int n ) { String res = " " ; int cr = 0 ; while ( cr < n ) { char mx = s . charAt ( cr ) ; for ( int i = cr + 1 ; i < n ; i ++ ) { mx = ( char ) Math . max ( mx , s . charAt ( i ) ) ; } int lst = cr ; for ( int i = cr ; i < n ; i ++ ) { if ( s . charAt ( i ) == mx ) { res += s . charAt ( i ) ; lst = i ; } } cr = lst + 1 ; } return res ; }
(method_declaration (modifiers) type: (type_identifier) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (string_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (identifier))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (identifier))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (identifier))))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (return_statement (identifier))))