public static void main ( String [ ] args ) {
  s = "geeksisforgeeksinplatformgeeks" ;
  z = new int [ s . length ( ) ] ;
  n = s . length ( ) ;
  z = z_function ( s . toCharArray ( ) ) ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    update ( z [ i ] , 1 ) ;
  }
  for ( int i = n - 1 ;
  i > 1 ;
  i -- ) {
    if ( z [ i ] != ( n - i ) ) continue ;
    if ( pref ( n ) - pref ( z [ i ] - 1 ) >= 2 ) {
      len = Math . max ( len , z [ i ] ) ;
    }
  }
  if ( len == 0 ) System . out . println ( "-1" ) ;
  else System . out . println ( s . substring ( 0 , len ) ) ;
}

public static void main ( String [ ] args ) { s = " geeksisforgeeksinplatformgeeks " ; z = new int [ s . length ( ) ] ; n = s . length ( ) ; z = z_function ( s . toCharArray ( ) ) ; for ( int i = 1 ; i < n ; i ++ ) { update ( z [ i ] , 1 ) ; } for ( int i = n - 1 ; i > 1 ; i -- ) { if ( z [ i ] != ( n - i ) ) continue ; if ( pref ( n ) - pref ( z [ i ] - 1 ) >= 2 ) { len = Math . max ( len , z [ i ] ) ; } } if ( len == 0 ) System . out . println ( " - 1" ) ; else System . out . println ( s . substring ( 0 , len ) ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (expression_statement (assignment_expression left: (identifier) right: (string_literal))) (expression_statement (assignment_expression left: (identifier) right: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (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 (method_invocation name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (decimal_integer_literal)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (decimal_integer_literal)))) condition: (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: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))) consequence: (continue_statement)) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (method_invocation name: (identifier) arguments: (argument_list (identifier))) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))))) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (array_access array: (identifier) index: (identifier)))))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_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) (identifier)))))))))