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  1. (define (solve)
  2.   (define (step n k)
  3.     (cond ((= n 3) k)
  4.           ((even? n) (step (/ n 2) (+ 1 k)))
  5.           (else (step (* 3 (+ 1 n)) (+ 1 k)))))
  6.   (define (max-step m n)
  7.     (if (zero? n) m
  8.         (let ((s (step n 0)))
  9.           (max-step
  10.            (if (< (car m) s) (cons s n) m)
  11.            (- n 1)))))
  12.   (max-step (cons 0 0) 10000)
  13.   )
  14.  
  15. (display "(step . n) = ")
  16. (display (solve))
  17. (newline)
  18.  
Success #stdin #stdout 0.5s 4408KB
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Standard input is empty
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(step . n) = (239 . 7421)
https://ideone.com/aSVmkC
language:
Scheme (guile 2.2.4)
created:
10 years ago
visibility:
secret

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