static int minimumRemoval ( int n , int a [ ] ) {
  Map < Integer , Integer > c = new HashMap < > ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) if ( c . containsKey ( a [ i ] ) ) {
    c . put ( a [ i ] , c . get ( a [ i ] ) + 1 ) ;
  }
  else {
    c . put ( a [ i ] , 1 ) ;
  }
  int ans = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    boolean ok = false ;
    for ( int j = 0 ;
    j < 31 ;
    j ++ ) {
      int x = ( 1 << j ) - a [ i ] ;
      if ( ( c . get ( x ) != null && ( c . get ( x ) > 1 ) ) || c . get ( x ) != null && ( c . get ( x ) == 1 && x != a [ i ] ) ) {
        ok = true ;
        break ;
      }
    }
    if ( ! ok ) ans ++ ;
  }
  return ans ;
}

static int minimumRemoval ( int n , int a [ ] ) { Map < Integer , Integer > c = new HashMap < > ( ) ; for ( int i = 0 ; i < n ; i ++ ) if ( c . containsKey ( a [ i ] ) ) { c . put ( a [ i ] , c . get ( a [ i ] ) + 1 ) ; } else { c . put ( a [ i ] , 1 ) ; } int ans = 0 ; for ( int i = 0 ; i < n ; i ++ ) { boolean ok = false ; for ( int j = 0 ; j < 31 ; j ++ ) { int x = ( 1 << j ) - a [ i ] ; if ( ( c . get ( x ) != null && ( c . get ( x ) > 1 ) ) || c . get ( x ) != null && ( c . get ( x ) == 1 && x != a [ i ] ) ) { ok = true ; break ; } } if ( ! ok ) ans ++ ; } return ans ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions))) 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)) 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: (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 (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) value: (false))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (decimal_integer_literal) right: (identifier))) right: (array_access array: (identifier) index: (identifier))))) (if_statement condition: (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (null_literal)) right: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (decimal_integer_literal))))) right: (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (null_literal)) right: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (true))) (break_statement))))) (if_statement condition: (parenthesized_expression (unary_expression operand: (identifier))) consequence: (expression_statement (update_expression (identifier)))))) (return_statement (identifier))))