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  1. ; etude on a binary tree
  2.  
  3. (define xs '(1 (2 (4 (8 () ()) (9 () ()))
  4. (5 (10 () ()) (11 () ()))) (3 (6 (12 () ())
  5. (13 () ())) (7 (14 () ()) (15 () ())))))
  6.  
  7. (define (f xs)
  8.   (if (null? xs) 0
  9.     (- (car xs) (f (cadr xs)) (f (caddr xs)))))
  10.  
  11. (display (f xs)) (newline)
Success #stdin #stdout 0.01s 42848KB
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https://ideone.com/rGqCjv
language:
Scheme (guile 2.2.4)
created:
6 years ago
visibility:
public

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