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https://github.com/standard-fish/summer-competititon-2019/blob/master/README.md

I try to run this code from SICP book: (define (count-leaves x) (cond ((null? x) 0) ((not (pair? x)) 1) (else (+ (count-leaves (car x)) (count-leaves (cdr x)))))) (count-leaves '('(1 2) '(3 4))) 6 (count-leaves '((1 2) '(3 4))) 5 How can I explain the result

I’m not sure I understand your question.

See my recent mailing list post for context.

#'(count-leaves '('(1 2) '(3 4)))

#'(count-leaves '((1 2) '(3 4)))

#'(count-leaves '((1 2) (3 4)))

displays: .#<syntax:unsaved-editor:9:2 (count-leaves (quote ((quote (1 2)) (quote (3 4)))))> .#<syntax:unsaved-editor:11:2 (count-leaves (quote ((1 2) (quote (3 4)))))> .#<syntax:unsaved-editor:13:2 (count-leaves (quote ((1 2) (3 4))))>

IIUC the leaves in the first example are: quote 1 2 quote 3 4 ==> 6 leaves

… in the second: 1 2 quote 3 4 ==> 5 leaves … in the third: 1 2 3 4 => 4 leaves

@thongpv87 ^

Thanks you for the explanation