static void Longestsubstring ( String s ) {
  int [ ] lps = compute_lps ( s ) ;
  int n = s . length ( ) ;
  if ( lps [ n - 1 ] == 0 ) {
    System . out . println ( - 1 ) ;
    return ;
  }
  for ( int i = 0 ;
  i < n - 1 ;
  i ++ ) {
    if ( lps [ i ] == lps [ n - 1 ] ) {
      System . out . println ( s . substring ( 0 , lps [ i ] ) ) ;
      return ;
    }
  }
  if ( lps [ lps [ n - 1 ] - 1 ] == 0 ) System . out . println ( - 1 ) ;
  else System . out . println ( s . substring ( 0 , lps [ lps [ n - 1 ] - 1 ] ) ) ;
}

static void Longestsubstring ( String s ) { int [ ] lps = compute_lps ( s ) ; int n = s . length ( ) ; if ( lps [ n - 1 ] == 0 ) { System . out . println ( - 1 ) ; return ; } for ( int i = 0 ; i < n - 1 ; i ++ ) { if ( lps [ i ] == lps [ n - 1 ] ) { System . out . println ( s . substring ( 0 , lps [ i ] ) ) ; return ; } } if ( lps [ lps [ n - 1 ] - 1 ] == 0 ) System . out . println ( - 1 ) ; else System . out . println ( s . substring ( 0 , lps [ lps [ n - 1 ] - 1 ] ) ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier))) body: (block (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation name: (identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (unary_expression operand: (decimal_integer_literal))))) (return_statement))) (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: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (array_access array: (identifier) index: (identifier))))))) (return_statement))))) (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal))) right: (decimal_integer_literal))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (unary_expression operand: (decimal_integer_literal))))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (array_access array: (identifier) index: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal)))))))))))