public static void main ( String args [ ] ) {
  Scanner in = new Scanner ( System . in ) ;
  int testCases = in . nextInt ( ) ;
  in . nextLine ( ) ;
  for ( int i = 0 ;
  i < testCases ;
  i ++ ) {
    int n = in . nextInt ( ) ;
    int k = in . nextInt ( ) ;
    in . nextLine ( ) ;
    int result = 0 ;
    if ( n < k ) {
      result = k - n ;
    }
    else {
      result = ( ( n - k ) % 2 == 0 ) ? 0 : 1 ;
    }
    System . out . println ( result ) ;
  }
}

public static void main ( String args [ ] ) { Scanner in = new Scanner ( System . in ) ; int testCases = in . nextInt ( ) ; in . nextLine ( ) ; for ( int i = 0 ; i < testCases ; i ++ ) { int n = in . nextInt ( ) ; int k = in . nextInt ( ) ; in . nextLine ( ) ; int result = 0 ; if ( n < k ) { result = k - n ; } else { result = ( ( n - k ) % 2 == 0 ) ? 0 : 1 ; } System . out . println ( result ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (method_invocation object: (identifier) name: (identifier) 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: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (ternary_expression condition: (parenthesized_expression (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (decimal_integer_literal) alternative: (decimal_integer_literal)))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))))