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Ingy döt Net 2013-04-11 01:07:29 -07:00
parent b83f433714
commit 68f8f3e56b
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11
Task/Sorting-algorithms-Pancake-sort/Common-Lisp/sorting-algorithms-pancake-sort-1.lisp Normal file
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(defun pancake-sort (seq)
"A destructive version of Pancake Sort that works with either lists or arrays of numbers."
(defun flip (lst index)
(setf (subseq lst 0 index) (reverse (subseq lst 0 index))))
(loop with lst = (coerce seq 'list)
for i from (length lst) downto 2
for index = (position (apply #'max (subseq lst 0 i)) lst)
do (unless (= index 0)
(flip lst (1+ index)))
(flip lst i)
finally (return (coerce lst (type-of seq)))))

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Task/Sorting-algorithms-Pancake-sort/Common-Lisp/sorting-algorithms-pancake-sort-2.lisp Normal file
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CL-USER> (pancake-sort '(6 7 8 9 2 5 3 4 1)) ;list
(1 2 3 4 5 6 7 8 9)
CL-USER> (pancake-sort #(6 7 8 9 2 5 3 4 1)) ;array
#(1 2 3 4 5 6 7 8 9)
CL-USER> (pancake-sort #(6.5 7.5 8 9 2 5 3 4 1.0)) ;array with integer and floating point values
#(1.0 2 3 4 5 6.5 7.5 8 9)