Petar Kapriš
2ca5e73a27
Notes: The exercise 2.37 on Hexlet's site has an error, noted in the comments. Also, their page for exercise 2.38 should probably have 0 tests. And finally, I did not calculate the exact number in the final exercise 2.43, but I included a relevant discussion.
14 lines
413 B
Scheme
14 lines
413 B
Scheme
#lang sicp
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(define (accumulate op initial sequence)
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(if (null? sequence)
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initial
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(op (car sequence)
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(accumulate op initial (cdr sequence)))))
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(define (count-leaves t)
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(accumulate + 0 (map (lambda (sub-t)
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(cond ((pair? sub-t) (count-leaves sub-t))
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((null? sub-t) 0)
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(else 1)))
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t)))
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