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(defun 01/parse-input-direct (input)
(mapcar 'parse-integer input))
;; Turn the input file into whatever form you will use for both parts
;; (get-file-lines) and (get-file-string) will be useful
(defun 01/parse-input (input-file)
(01/parse-input-direct (get-file-lines input-file)))
;; Loops through two item windows on input and counts each time the first is less than the second
(defun 01/part-a (parsed-input)
(let ((sum 0) (prev (car parsed-input)))
(dolist (i (cons prev parsed-input))
(when (> i prev) (incf sum))
(setf prev i))
sum))
;; Similar to part a, but with four item windows, comparing the sum of the first 3 with the next 3
(defun 01/part-b (parsed-input)
(loop for (w x y z) on parsed-input until (null z) if (< (+ w x y) (+ x y z)) count w))
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