19 lines
501 B
Racket
19 lines
501 B
Racket
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#lang racket
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(require racket/control)
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(define (fringe-iterator tree)
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(λ() (let loop ([tree tree])
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(if (list? tree) (for-each loop tree) (fcontrol tree)))
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(fcontrol (void))))
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(define (same-fringe? tree1 tree2)
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(let loop ([iter1 (fringe-iterator tree1)]
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[iter2 (fringe-iterator tree2)])
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(% (iter1)
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(λ (x1 iter1)
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(% (iter2)
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(λ (x2 iter2)
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(and (equal? x1 x2)
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(or (void? x1) (loop iter1 iter2)))))))))
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