- P202-203
- 参加者5人
- Exercise 3.69
(define triples
(lambda (s t u)
(cons-stream
(list (stream-car s) (stream-car t) (stream-car u))
(interleave
(stream-map
(lambda (x) (cons (stream-car s) x))
(stream-cdr (pairs t u)))
(triples (stream-cdr s)
(stream-cdr t)
(stream-cdr u))))))
(define int-triples (triples integers integers integers))
(define pythagoras-triple?
(lambda (triple)
(let ((i (car triple))
(j (cadr triple))
(k (caddr triple)))
(= (+ (* i i) (* j j))
(* k k)))))
(display-stream-n
(stream-filter pythagoras-triple? int-triples)
5)
- Exercise 3.70 の途中で時間切れ.
- サイボウズラボは今月いっぱいで某所に引っ越しらしい.