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  1. ; disordered binary search trees
  2.  
  3. (define (ordered? lt? tree)
  4.   (or (null? tree)
  5.       (and (ordered? lt? (cadr tree))
  6.            (ordered? lt? (caddr tree))
  7.            (or (null? (cadr tree))
  8.                (lt? (caadr tree) (car tree)))
  9.            (or (null? (caddr tree))
  10.                (lt? (car tree) (caaddr tree))))))
  11.  
  12. (display (ordered? < '(4 (0 () (1 () (2 () (3 () ())))) (5 () (6 () ()))))) (newline)
  13. (display (ordered? < '(6 (0 () (1 () (2 () (3 () ())))) (5 () (4 () ()))))) (newline)
Success #stdin #stdout 0s 42976KB
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https://ideone.com/i7MGDU
language:
Scheme (guile 2.2.4)
created:
7 years ago
visibility:
public

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