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; sparse sets (define n 0) (define d #f) (define s #f) (define (make-set u) (set! d (make-vector u)) (set! s (make-vector u))) (define (clear) (set! n 0)) (define (insert k) (vector-set! d n k) (vector-set! s k n) (set! n (+ n 1))) (define (member? k) (and (< (vector-ref s k) n) (= (vector-ref d (vector-ref s k)) k))) (define (for-all proc) (do ((i 0 (+ i 1))) ((= i n)) (proc (vector-ref d i)))) (make-set 8) (clear) (insert 5) (insert 1) (insert 4) (display (member? 0)) (newline) (display (member? 1)) (newline) (display (member? 2)) (newline) (display (member? 3)) (newline) (display (member? 4)) (newline) (display (member? 5)) (newline) (display (member? 6)) (newline) (display (member? 7)) (newline) (display d) (newline) (display s) (newline)
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