master
4903000 4 years ago
parent abc495ba84
commit 10337239e2

@ -408,3 +408,45 @@
(p1 (solve-9-1 step-size data)))
(print p1)
(print (solve-9-2 data p1)))))
;;; Day 10
(defun read-10 (file)
(read-9 file))
(defun solve-10-1 (data)
(let ((data (sort data #'<))
(steps (list 1 0 1)))
(reduce (lambda (x y)
(let ((difference (- y x)))
(incf (nth (1- difference) steps))
y))
data)
(* (first steps) (third steps))))
(let ((ht (make-hash-table)))
(defun recurse-adapters (data)
(if (gethash (car data) ht)
(gethash (car data) ht)
(setf (gethash (car data) ht)
(%recurse-adapters data)))))
(defun %recurse-adapters (data)
(if (null (cdr data))
1
(let ((ceiling (+ 3 (first data))))
(reduce #'+ (map 'list #'recurse-adapters
(remove-if-not
#'consp
(list (and (cdr data) (>= ceiling (cadr data)) (cdr data))
(and (cddr data) (>= ceiling (caddr data)) (cddr data))
(and (cdddr data) (>= ceiling (cadddr data)) (cdddr data)))))))))
(defun solve-10-2 (data)
(let* ((data (cons 0 (coerce (sort data #'<) 'list))))
(recurse-adapters data)))
(defun solve-10 (file)
(let ((data (read-10 file)))
(time (progn (print (solve-10-1 data))
(print (solve-10-2 data))))))

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