static int maximumChars ( String str ) {
  int n = str . length ( ) ;
  int res = - 1 ;
  int [ ] firstInd = new int [ MAX_CHAR ] ;
  for ( int i = 0 ;
  i < MAX_CHAR ;
  i ++ ) firstInd [ i ] = - 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int first_ind = firstInd [ str . charAt ( i ) ] ;
    if ( first_ind == - 1 ) firstInd [ str . charAt ( i ) ] = i ;
    else res = Math . max ( res , Math . abs ( i - first_ind - 1 ) ) ;
  }
  return res ;
}

static int maximumChars ( String str ) { int n = str . length ( ) ; int res = - 1 ; int [ ] firstInd = new int [ MAX_CHAR ] ; for ( int i = 0 ; i < MAX_CHAR ; i ++ ) firstInd [ i ] = - 1 ; for ( int i = 0 ; i < n ; i ++ ) { int first_ind = firstInd [ str . charAt ( i ) ] ; if ( first_ind == - 1 ) firstInd [ str . charAt ( i ) ] = i ; else res = Math . max ( res , Math . abs ( i - first_ind - 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: (unary_expression operand: (decimal_integer_literal)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (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: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (unary_expression operand: (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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (array_access array: (identifier) index: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (unary_expression operand: (decimal_integer_literal)))) consequence: (expression_statement (assignment_expression left: (array_access array: (identifier) index: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) right: (identifier))) alternative: (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))))))))))) (return_statement (identifier))))