Created
November 22, 2013 19:47
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Quicksort in scheme. It's beautiful! :'(
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| (define less | |
| (lambda (L x) | |
| (cond ((null? L) '()) | |
| ((< (car L) x) (cons (car L) (less (cdr L) x))) | |
| (else (less (cdr L) x))))) | |
| (define great | |
| (lambda (L x) | |
| (cond ((null? L) '()) | |
| ((> (car L) x) (cons (car L) (great (cdr L) x))) | |
| (else (great (cdr L) x))))) | |
| (define append | |
| (lambda (L M) | |
| (if (null? L) | |
| M | |
| (cons (car L) (append (cdr L) M))))) | |
| (define quicksort | |
| (lambda (L) | |
| (if (null? L) | |
| '() | |
| (append | |
| (append | |
| (quicksort (less L (car L))) | |
| (list (car L))) | |
| (quicksort (great L (car L))))))) | |
| (define user-input | |
| (lambda (l n) | |
| (if (= n 0) | |
| l | |
| (user-input (append (list (read)) l) (- n 1))))) | |
| (display "Enter the number of elements: ") | |
| (define n (read)) | |
| (display "Input the elements in the list: ") | |
| (define L (user-input '() n)) | |
| (display "Unsorted list: ") | |
| (display L) (newline) | |
| (display "The sorted list: ") | |
| (display (quicksort L)) (newline) |
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