static char maxRepeating ( String str ) {
  int n = str . length ( ) ;
  int count = 0 ;
  char res = str . charAt ( 0 ) ;
  int cur_count = 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( i < n - 1 && str . charAt ( i ) == str . charAt ( i + 1 ) ) cur_count ++ ;
    else {
      if ( cur_count > count ) {
        count = cur_count ;
        res = str . charAt ( i ) ;
      }
      cur_count = 1 ;
    }
  }
  return res ;
}

static char maxRepeating ( String str ) { int n = str . length ( ) ; int count = 0 ; char res = str . charAt ( 0 ) ; int cur_count = 1 ; for ( int i = 0 ; i < n ; i ++ ) { if ( i < n - 1 && str . charAt ( i ) == str . charAt ( i + 1 ) ) cur_count ++ ; else { if ( cur_count > count ) { count = cur_count ; res = str . charAt ( i ) ; } cur_count = 1 ; } } return res ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (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 (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))))) consequence: (expression_statement (update_expression (identifier))) alternative: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))))) (return_statement (identifier))))