static void makePermutation ( int [ ] a , int n ) {
  HashMap < Integer , Integer > count = new HashMap < Integer , Integer > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( count . containsKey ( a [ i ] ) ) {
      count . put ( a [ i ] , count . get ( a [ i ] ) + 1 ) ;
    }
    else {
      count . put ( a [ i ] , 1 ) ;
    }
  }
  int next_missing = 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( count . containsKey ( a [ i ] ) && count . get ( a [ i ] ) != 1 || a [ i ] > n || a [ i ] < 1 ) {
      count . put ( a [ i ] , count . get ( a [ i ] ) - 1 ) ;
      while ( count . containsKey ( next_missing ) ) next_missing ++ ;
      a [ i ] = next_missing ;
      count . put ( next_missing , 1 ) ;
    }
  }
}

static void makePermutation ( int [ ] a , int n ) { HashMap < Integer , Integer > count = new HashMap < Integer , Integer > ( ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( count . containsKey ( a [ i ] ) ) { count . put ( a [ i ] , count . get ( a [ i ] ) + 1 ) ; } else { count . put ( a [ i ] , 1 ) ; } } int next_missing = 1 ; for ( int i = 0 ; i < n ; i ++ ) { if ( count . containsKey ( a [ i ] ) && count . get ( a [ i ] ) != 1 || a [ i ] > n || a [ i ] < 1 ) { count . put ( a [ i ] , count . get ( a [ i ] ) - 1 ) ; while ( count . containsKey ( next_missing ) ) next_missing ++ ; a [ i ] = next_missing ; count . put ( next_missing , 1 ) ; } } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (integral_type) dimensions: (dimensions)) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_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 (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (decimal_integer_literal)))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (decimal_integer_literal)))))))) (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 (binary_expression left: (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (decimal_integer_literal))))) (while_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) body: (expression_statement (update_expression (identifier)))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal))))))))))