static int pref ( int idx ) {
  int ans = 0 ;
  while ( idx > 0 ) {
    ans += bit [ idx ] ;
    idx -= ( idx & - idx ) ;
  }
  return ans ;
}

static int pref ( int idx ) { int ans = 0 ; while ( idx > 0 ) { ans += bit [ idx ] ; idx -= ( idx & - idx ) ; } return ans ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) body: (block (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (unary_expression operand: (identifier)))))))) (return_statement (identifier))))