static int countOperations ( int arr [ ] , int n ) {
  int count = 0 ;
  for ( int i = 0 ;
  i < n - 1 ;
  i ++ ) {
    if ( arr [ i ] % 2 == 1 ) {
      arr [ i ] ++ ;
      arr [ i + 1 ] ++ ;
      count += 2 ;
    }
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( arr [ i ] % 2 == 1 ) return - 1 ;
  }
  return count ;
}

static int countOperations ( int arr [ ] , int n ) { int count = 0 ; for ( int i = 0 ; i < n - 1 ; i ++ ) { if ( arr [ i ] % 2 == 1 ) { arr [ i ] ++ ; arr [ i + 1 ] ++ ; count += 2 ; } } for ( int i = 0 ; i < n ; i ++ ) { if ( arr [ i ] % 2 == 1 ) return - 1 ; } 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: (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: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (array_access array: (identifier) index: (identifier)))) (expression_statement (update_expression (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))))) (expression_statement (assignment_expression left: (identifier) right: (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: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (return_statement (unary_expression operand: (decimal_integer_literal)))))) (return_statement (identifier))))