static int no_of_ways ( int a [ ] , int n ) {
  int count_0 = 0 , count_1 = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( a [ i ] == 0 ) count_0 ++ ;
    else count_1 ++ ;
  }
  if ( count_1 % 2 == 0 ) return count_0 ;
  else return count_1 ;
}

static int no_of_ways ( int a [ ] , int n ) { int count_0 = 0 , count_1 = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( a [ i ] == 0 ) count_0 ++ ; else count_1 ++ ; } if ( count_1 % 2 == 0 ) return count_0 ; else return count_1 ; }
(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: (decimal_integer_literal)) 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: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (expression_statement (update_expression (identifier))) alternative: (expression_statement (update_expression (identifier)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (return_statement (identifier)) alternative: (return_statement (identifier)))))