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  1. (defun count-unique-values (list)
  2.   (let ((map (make-hash-table)))
  3.     (loop for x in list
  4.        do (setf (gethash x map) 1))
  5.     (hash-table-count map)))
  6.  
  7.  
  8. (defun test (list)
  9.   (format t "Testing ~a: ~a ~%" list (count-unique-values list)))
  10.  
  11. (test '(1 2 3))
  12. (test '(1 2 3 3))
  13. (test '(1 1 2 2 3 3))
  14.  
  15.  
  16.  
  17.  
Success #stdin #stdout 0s 10520KB
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Standard input is empty
stdout
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Testing (1 2 3): 3 
Testing (1 2 3 3): 3 
Testing (1 1 2 2 3 3): 3
https://ideone.com/c5GOwx
language:
Common Lisp (clisp 2.49.92)
created:
10 years ago
visibility:
public

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