static int getLevenstein ( StringBuilder input ) {
  StringBuilder revInput = new StringBuilder ( input ) ;
  revInput = revInput . reverse ( ) ;
  int n = input . length ( ) ;
  int [ ] [ ] dp = new int [ n + 1 ] [ n + 1 ] ;
  for ( int i = 0 ;
  i <= n ;
  ++ i ) {
    dp [ 0 ] [ i ] = i ;
    dp [ i ] [ 0 ] = i ;
  }
  for ( int i = 1 ;
  i <= n ;
  ++ i ) {
    for ( int j = 1 ;
    j <= n ;
    ++ j ) {
      if ( input . charAt ( i - 1 ) == revInput . charAt ( j - 1 ) ) dp [ i ] [ j ] = dp [ i - 1 ] [ j - 1 ] ;
      else dp [ i ] [ j ] = 1 + Math . min ( dp [ i - 1 ] [ j ] , dp [ i ] [ j - 1 ] ) ;
    }
  }
  int res = Integer . MAX_VALUE ;
  for ( int i = n , j = 0 ;
  i >= 0 ;
  i -- , j ++ ) {
    res = Math . min ( res , dp [ i ] [ j ] ) ;
    if ( i < n ) res = Math . min ( res , dp [ i + 1 ] [ j ] ) ;
    if ( i > 0 ) res = Math . min ( res , dp [ i - 1 ] [ j ] ) ;
  }
  return res ;
}

static int getLevenstein ( StringBuilder input ) { StringBuilder revInput = new StringBuilder ( input ) ; revInput = revInput . reverse ( ) ; int n = input . length ( ) ; int [ ] [ ] dp = new int [ n + 1 ] [ n + 1 ] ; for ( int i = 0 ; i <= n ; ++ i ) { dp [ 0 ] [ i ] = i ; dp [ i ] [ 0 ] = i ; } for ( int i = 1 ; i <= n ; ++ i ) { for ( int j = 1 ; j <= n ; ++ j ) { if ( input . charAt ( i - 1 ) == revInput . charAt ( j - 1 ) ) dp [ i ] [ j ] = dp [ i - 1 ] [ j - 1 ] ; else dp [ i ] [ j ] = 1 + Math . min ( dp [ i - 1 ] [ j ] , dp [ i ] [ j - 1 ] ) ; } } int res = Integer . MAX_VALUE ; for ( int i = n , j = 0 ; i >= 0 ; i -- , j ++ ) { res = Math . min ( res , dp [ i ] [ j ] ) ; if ( i < n ) res = Math . min ( res , dp [ i + 1 ] [ j ] ) ; if ( i > 0 ) res = Math . min ( res , dp [ i - 1 ] [ j ] ) ; } 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: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (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: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal))) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (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 (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (decimal_integer_literal)) index: (identifier)) right: (identifier))) (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (decimal_integer_literal)) right: (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 (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))))) consequence: (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (binary_expression left: (identifier) right: (decimal_integer_literal))))) alternative: (expression_statement (assignment_expression left: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)) right: (binary_expression left: (decimal_integer_literal) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (identifier)) (array_access array: (array_access array: (identifier) index: (identifier)) index: (binary_expression left: (identifier) right: (decimal_integer_literal))))))))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (identifier)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (identifier))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (array_access array: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) index: (identifier))))))))) (return_statement (identifier))))