36 lines
1.1 KiB
Common Lisp
36 lines
1.1 KiB
Common Lisp
(require :uiop)
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(load (sb-ext:posix-getenv "ASDF"))
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(asdf:load-system 'str)
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(defun get-range (range)
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(let ((range (str:split "-" range)))
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(loop for i from (parse-integer (car range)) to (parse-integer (car (cdr range))) collect i)))
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(get-range "11-22")
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(defun get-ranges (instr)
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(loop for range in
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(str:split "," (string-trim '(#\Newline) instr))
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collect
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(get-range range)))
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(get-ranges "1-3,4-5")
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(defun validate-product-id (product-id)
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(let ((product-id (format nil "~A" product-id)))
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(setq product-id-length (length product-id))
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(setq split-at (/ product-id-length 2))
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;(print product-id)
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(cond
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((not (evenp product-id-length)) t)
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(t (not (string= (subseq product-id 0 split-at) (subseq product-id split-at)))))))
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(validate-product-id 1212)
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(validate-product-id 123)
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(validate-product-id 1234)
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(defun sum-all-invalid-ids (text)
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(reduce #'+
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(remove-if #'validate-product-id
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(reduce #'append
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(get-ranges text)))))
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(sum-all-invalid-ids (uiop:read-file-string "02example.txt"))
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(sum-all-invalid-ids (uiop:read-file-string "02data.txt"))
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