static int find ( int a [ ] , int b [ ] , int k , int n1 , int n2 ) {
  LinkedHashSet < Integer > s = new LinkedHashSet < > ( ) ;
  for ( int i = 0 ;
  i < n2 ;
  i ++ ) s . add ( b [ i ] ) ;
  int missing = 0 ;
  for ( int i = 0 ;
  i < n1 ;
  i ++ ) {
    if ( ! s . contains ( a [ i ] ) ) missing ++ ;
    if ( missing == k ) return a [ i ] ;
  }
  return - 1 ;
}

static int find ( int a [ ] , int b [ ] , int k , int n1 , int n2 ) { LinkedHashSet < Integer > s = new LinkedHashSet < > ( ) ; for ( int i = 0 ; i < n2 ; i ++ ) s . add ( b [ i ] ) ; int missing = 0 ; for ( int i = 0 ; i < n1 ; i ++ ) { if ( ! s . contains ( a [ i ] ) ) missing ++ ; if ( missing == k ) return a [ i ] ; } return - 1 ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))))) consequence: (expression_statement (update_expression (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (return_statement (array_access array: (identifier) index: (identifier)))))) (return_statement (unary_expression operand: (decimal_integer_literal)))))