Write a lisp program to check whether a binary tree is a Binary Search Tree. A Binary Search Tree (BST) is a tree in which all the nodes follow the below-mentioned properties:
- The left sub-tree of a node has a key less than or equal to its parent node's key.
- The right sub-tree of a node has a key greater than to its parent node's key.

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Q .2 -------

Lambda :

(setq V (list 2 6 8))
(setq VSquare (mapcar '(lambda (n) (* n n)) V))
(setq VSqrt (sqrt (+ (car VSquare) (cadr VSquare) (caddr VSquare))))

Iteration :

(setq V (list 2 6 8))
(setq i 0)
(setq sum 0)
(loop while (< i (length V)) do
   (setq sum ( + sum (* (nth i V) (nth i V))))
   (setq i (1+ i))
(print (sqrt sum))

Q.3 ------------

(defun SubProcessList(argList)
   (let ((len 0)(i 0))
       ; Anything within let stays local for defined variables .. which are len and i in this case
       (setq len (length argList))      
       (setq i 0)
       (loop while (< i len) do
          (setq item (nth i argList))
                  (listp item)
                  ; Check if the current item if is type list, Call SubProcessList recursivly
                  (SubProcessList item)
                  (symbolp item)
                  ; check if the current item is symbol
                  ; Append in finallst is the item is not a member in finallst
                  (if(null (member item finallst))
                   (setq finallst (append finallst (list item))))
          (setq i (1+ i))

(defun ProcessList (argList)
   (SETQ finallst NIL)
   (setq finallst(SubProcessList argList))
   (print finallst)

(setq lst '( (n) 2 (6 h 7.8) (w f) (n) (c) n) )
(ProcessList lst)

Q.4 -----

(defun even-indices-rec(argList argIndex)
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