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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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21
Task/Non-continuous-subsequences/Common-Lisp/non-continuous-subsequences-1.lisp Normal file
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(defun all-subsequences (list)
(labels ((subsequences (tail &optional (acc '()) (result '()))
"Return a list of the subsequence designators of the
subsequences of tail. Each subsequence designator is a
list of tails of tail, the subsequence being the first
element of each tail."
(if (endp tail)
(list* (reverse acc) result)
(subsequences (rest tail) (list* tail acc)
(append (subsequences (rest tail) acc) result))))
(continuous-p (subsequence-d)
"True if the designated subsequence is continuous."
(loop for i in subsequence-d
for j on (first subsequence-d)
always (eq i j)))
(designated-sequence (subsequence-d)
"Destructively transforms a subsequence designator into
the designated subsequence."
(map-into subsequence-d 'first subsequence-d)))
(let ((nc-subsequences (delete-if #'continuous-p (subsequences list))))
(map-into nc-subsequences #'designated-sequence nc-subsequences))))

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Task/Non-continuous-subsequences/Common-Lisp/non-continuous-subsequences-2.lisp Normal file
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(defun all-subsequences2 (list)
(labels ((recurse (s list)
(if (endp list)
(if (>= s 3)
'(())
'())
(let ((x (car list))
(xs (cdr list)))
(if (evenp s)
(append (mapcar (lambda (ys) (cons x ys))
(recurse (+ s 1) xs))
(recurse s xs))
(append (mapcar (lambda (ys) (cons x ys))
(recurse s xs))
(recurse (+ s 1) xs)))))))
(recurse 0 list)))