static boolean checkStackPermutation ( int ip [ ] , int op [ ] , int n ) {
  Queue < Integer > input = new LinkedList < > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    input . add ( ip [ i ] ) ;
  }
  Queue < Integer > output = new LinkedList < > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    output . add ( op [ i ] ) ;
  }
  Stack < Integer > tempStack = new Stack < > ( ) ;
  while ( ! input . isEmpty ( ) ) {
    int ele = input . poll ( ) ;
    if ( ele == output . peek ( ) ) {
      output . poll ( ) ;
      while ( ! tempStack . isEmpty ( ) ) {
        if ( tempStack . peek ( ) == output . peek ( ) ) {
          tempStack . pop ( ) ;
          output . poll ( ) ;
        }
        else break ;
      }
    }
    else {
      tempStack . push ( ele ) ;
    }
  }
  return ( input . isEmpty ( ) && tempStack . isEmpty ( ) ) ;
}

static boolean checkStackPermutation ( int ip [ ] , int op [ ] , int n ) { Queue < Integer > input = new LinkedList < > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { input . add ( ip [ i ] ) ; } Queue < Integer > output = new LinkedList < > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { output . add ( op [ i ] ) ; } Stack < Integer > tempStack = new Stack < > ( ) ; while ( ! input . isEmpty ( ) ) { int ele = input . poll ( ) ; if ( ele == output . peek ( ) ) { output . poll ( ) ; while ( ! tempStack . isEmpty ( ) ) { if ( tempStack . peek ( ) == output . peek ( ) ) { tempStack . pop ( ) ; output . poll ( ) ; } else break ; } } else { tempStack . push ( ele ) ; } } return ( input . isEmpty ( ) && tempStack . isEmpty ( ) ) ; }
(method_declaration (modifiers) type: (boolean_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))) 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: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))))) (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: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))))) (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)))) (while_statement condition: (parenthesized_expression (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (while_statement condition: (parenthesized_expression (unary_expression operand: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) alternative: (break_statement))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))))) (return_statement (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))