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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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Task/Hailstone-sequence/Common-Lisp/hailstone-sequence.lisp Normal file
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(defun hailstone (n)
(cond ((= n 1) '(1))
((evenp n) (cons n (hailstone (/ n 2))))
(t (cons n (hailstone (+ (* 3 n) 1))))))
(defun longest (n)
(let ((k 0) (l 0))
(loop for i from 1 below n do
(let ((len (length (hailstone i))))
(when (> len l) (setq l len k i)))
finally (format t "Longest hailstone sequence under ~A for ~A, having length ~A." n k l))))