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MergeSort with a twist - Scheme

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Old   November 9, 2011, 19:48
Default MergeSort with a twist - Scheme
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Daniel Yacouboff
Join Date: Nov 2011
Posts: 3
Rep Power: 8
ydan87 is on a distinguished road
Hello there,
I would like to implement MergeSort numbers given in a list, but following the following algorithm:
1) break the given list into list of lists, with a single number in each list (i.e. from (5 2 6) to ((5) (2) (6)))

2) iterate over the list of lists - merge each 2 adjacent lists and create a list of the results (example: from ((5) (2) (7) (1)) to ((5 2) (7 1)) or from ((5) (2) (7)) to ((5 2) (7)))

3) repeat step 2 until there is only one element in the list, which is the sorted list.

4) return it.

here's my suggestion code, what's wrong with it ?
(define (fasterMergeSort lst)
  (define (break lst)
    (if (null? lst) ()
        (cons (list (car lst)) (break (cdr lst)))))
  (define (merge lst1 lst2)
    (cond ((null? lst1) (car lst2))
          ((null? lst2) (car lst1))
          ((< (car lst1) (car lst2)) (list (car lst1) (merge (cdr lst1) lst2)))
          (else (list (car lst2) (merge lst1 (cdr lst2))))))
  (define (iter lst)
    (cond ((null? lst) ())
          ((= (length lst) 1) lst)
          (else (cons (merge (car lst) (cadr lst)) (iter (cddr lst))))))
  (cond ((null? lst) 'no-list)
        ((= (length lst) 1) lst)
        (else (let* ((lstBroken (break lst)) (mergeBrokenLst (merge (car lstBroken)(cdr lstBroken))))
                (if (= (length mergeBrokenLst) 1) mergeBrokenLst
                    (iter mergeBrokenLst))))))

Thanks in advance
ydan87 is offline   Reply With Quote


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