Cartesian product of two or more lists: Difference between revisions
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=={{header|Common Lisp}}== |
=={{header|Common Lisp}}== |
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<lang lisp>(defun cartesian-product (l) |
<lang lisp>(defun n-cartesian-product (l) |
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"Compute the n-cartesian product of a list of sets represented as list with a mixed recursive-iterative approach. |
"Compute the n-cartesian product of a list of sets represented as list with a mixed recursive-iterative approach. |
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Algorithm: |
Algorithm: |
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(list nil) |
(list nil) |
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(loop for x in (car l) |
(loop for x in (car l) |
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nconc (loop for y in (cartesian-product (cdr l)) |
nconc (loop for y in (n-cartesian-product (cdr l)) |
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collect (cons x y)))))</lang> |
collect (cons x y)))))</lang> |
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