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Ingy döt Net 2013-04-11 01:07:29 -07:00
parent b83f433714
commit 68f8f3e56b
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19
Task/Sorting-algorithms-Cocktail-sort/Common-Lisp/sorting-algorithms-cocktail-sort.lisp Normal file
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(defun cocktail-sort-vector (vector predicate &aux (len (length vector)))
(labels ((scan (start step &aux swapped)
(loop for i = start then (+ i step) while (< 0 i len) do
(when (funcall predicate (aref vector i)
(aref vector (1- i)))
(rotatef (aref vector i)
(aref vector (1- i)))
(setf swapped t)))
swapped))
(loop while (and (scan 1 1)
(scan (1- len) -1))))
vector)
(defun cocktail-sort (sequence predicate)
(etypecase sequence
(vector (cocktail-sort-vector sequence predicate))
(list (map-into sequence 'identity
(cocktail-sort-vector (coerce sequence 'vector)
predicate)))))