static int findFlips ( String str , int n ) {
  char last = ' ' ;
  int res = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( last != str . charAt ( i ) ) res ++ ;
    last = str . charAt ( i ) ;
  }
  return res / 2 ;
}

static int findFlips ( String str , int n ) { char last = ' ▁ ' ; int res = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( last != str . charAt ( i ) ) res ++ ; last = str . charAt ( i ) ; } return res / 2 ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (character_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 (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) consequence: (expression_statement (update_expression (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) (return_statement (binary_expression left: (identifier) right: (decimal_integer_literal)))))