static int maxLength ( String str , int len ) {
  int res = 0 ;
  int lastPos [ ] = new int [ MAX ] ;
  for ( int i = 0 ;
  i < MAX ;
  i ++ ) {
    lastPos [ i ] = - 1 ;
  }
  for ( int i = 0 ;
  i < len ;
  i ++ ) {
    int C = str . charAt ( i ) - 'a' ;
    if ( lastPos [ C ] != - 1 ) {
      res = Math . max ( len - ( i - lastPos [ C ] - 1 ) - 1 , res ) ;
    }
    lastPos [ C ] = i ;
  }
  return res ;
}

static int maxLength ( String str , int len ) { int res = 0 ; int lastPos [ ] = new int [ MAX ] ; for ( int i = 0 ; i < MAX ; i ++ ) { lastPos [ i ] = - 1 ; } for ( int i = 0 ; i < len ; i ++ ) { int C = str . charAt ( i ) - ' a ' ; if ( lastPos [ C ] != - 1 ) { res = Math . max ( len - ( i - lastPos [ C ] - 1 ) - 1 , res ) ; } lastPos [ C ] = i ; } return res ; }
(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: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) 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: (block (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: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal)))) (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (unary_expression operand: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))) right: (decimal_integer_literal)))) right: (decimal_integer_literal)) (identifier))))))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier))))) (return_statement (identifier))))