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(ql:quickload '(fiveam cl-json))
(defun input (filename &optional dividers)
(with-open-file (in filename)
(let ((data (loop for a = (ignore-errors (list (json:decode-json in) (json:decode-json in)))
while a
nconc a)))
(if dividers (append '(((2)) ((6))) data) data))))
(defun compare (f s)
(cond
((eq f s) 'next)
((and (null f) (not (null s))) t)
((and (not (null f)) (null s)) nil)
((and (integerp f) (integerp s)) (< f s))
((and (integerp f) (consp s)) (compare (list f) s))
((and (consp f) (integerp s)) (compare f (list s)))
((let ((result (compare (car f) (car s))))
(if (eq 'next result) (compare (cdr f) (cdr s))
result)))))
(defun solver-1 (filename)
(loop for i from 1
for (a b) on (input filename) by #'cddr
when (compare a b)
sum i))
(fiveam:test first
(fiveam:is (= 13 (solver-1 "eg-in")))
(fiveam:is (= 5330 (solver-1 "input"))))
(defun solver-2 (filename)
(let ((packages (sort (input filename t) #'compare)))
(*
(1+ (position '((2)) packages :test #'equal))
(1+ (position '((6)) packages :test #'equal)))))
(fiveam:test second
(fiveam:is (= 140 (solver-2 "eg-in")))
(fiveam:is (= 27648 (solver-2 "input"))))
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