Created
December 8, 2023 00:04
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;;; #1 removeNILTop | |
(defun removeNILTop (lst) | |
(remove-if #'null lst)) | |
(removeNILTop '(NIL X NIL NIL Y NIL Z)) | |
(removeNILTop '(X NIL Y NIL Z NIL)) | |
(removeNILTop '(NIL (X NIL Y) (NIL NIL))) | |
;;; #2 removeNILMost | |
(defun removeNILMost (lst) | |
(if (atom lst) | |
lst | |
(if (and (null (car lst)) (null (cdr lst))) | |
nil | |
(cons (removeNILMost (car lst)) | |
(removeNILMost (cdr lst)))))) | |
(removeNILMost '(NIL X NIL NIL Y NIL Z)) | |
(removeNILMost '(X NIL (Y NIL Z) NIL)) | |
(removeNILMost '(NIL (NIL) (X NIL Y) (NIL NIL) Z)) | |
(removeNILMost '(NIL ( (((((NIL) NIL))))))) | |
;;; #3 reverseTop | |
(defun reverseTop (lst) | |
(if (atom lst) | |
lst | |
(let ((result nil)) | |
(dolist (item lst) | |
(setq result (cons item result))) | |
result))) | |
(reverseTop '(X Y Z)) | |
(reverseTop '(X (Y Z (A)) (W))) | |
;;; #4 reverseALL | |
(defun reverseAll (lst) | |
(if (atom lst) | |
lst | |
(reverse (mapcar #'reverseAll lst)))) | |
(reverseAll '(X Y Z)) | |
(reverseAll '(X (Y Z (A)) (W))) | |
;;; #5 palindrome | |
(defun palindrome (lst) | |
(equal lst (reverseTop lst))) | |
(palindrome '(R A C E C A R)) | |
(palindrome '(W A S I T A C A R O R A C A T I S A W)) | |
(palindrome '(N I X O N)) |
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