static int freqPairs ( int arr [ ] , int n ) {
  int max = Arrays . stream ( arr ) . max ( ) . getAsInt ( ) ;
  int freq [ ] = new int [ max + 1 ] ;
  int count = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    freq [ arr [ i ] ] ++ ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    for ( int j = 2 * arr [ i ] ;
    j <= max ;
    j += arr [ i ] ) {
      if ( freq [ j ] >= 1 ) {
        count += freq [ j ] ;
      }
    }
    if ( freq [ arr [ i ] ] > 1 ) {
      count += freq [ arr [ i ] ] - 1 ;
      freq [ arr [ i ] ] -- ;
    }
  }
  return count ;
}

static int freqPairs ( int arr [ ] , int n ) { int max = Arrays . stream ( arr ) . max ( ) . getAsInt ( ) ; int freq [ ] = new int [ max + 1 ] ; int count = 0 ; for ( int i = 0 ; i < n ; i ++ ) { freq [ arr [ i ] ] ++ ; } for ( int i = 0 ; i < n ; i ++ ) { for ( int j = 2 * arr [ i ] ; j <= max ; j += arr [ i ] ) { if ( freq [ j ] >= 1 ) { count += freq [ j ] ; } } if ( freq [ arr [ i ] ] > 1 ) { count += freq [ arr [ i ] ] - 1 ; freq [ arr [ i ] ] -- ; } } return count ; }
(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))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (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 (expression_statement (update_expression (array_access array: (identifier) index: (array_access array: (identifier) index: (identifier))))))) (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 (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (decimal_integer_literal) right: (array_access array: (identifier) index: (identifier))))) condition: (binary_expression left: (identifier) right: (identifier)) update: (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (array_access array: (identifier) index: (identifier))) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (array_access array: (identifier) index: (identifier))) right: (decimal_integer_literal)))) (expression_statement (update_expression (array_access array: (identifier) index: (array_access array: (identifier) index: (identifier))))))))) (return_statement (identifier))))