From 93b8ae46207cf29660fb3c21d34dc45ee872c670 Mon Sep 17 00:00:00 2001 From: Aryadev Chavali Date: Thu, 13 Jul 2023 15:33:49 +0100 Subject: (2022)-deleted puzzle files I think I did this by accident, check out https://git.aryadevchavali.com/advent-of-code/ for my actual advent of code runs. --- 2022/puzzle-4.lisp | 59 ------------------------------------------------------ 1 file changed, 59 deletions(-) delete mode 100644 2022/puzzle-4.lisp (limited to '2022/puzzle-4.lisp') diff --git a/2022/puzzle-4.lisp b/2022/puzzle-4.lisp deleted file mode 100644 index 04c7bfb..0000000 --- a/2022/puzzle-4.lisp +++ /dev/null @@ -1,59 +0,0 @@ -;; Example input: a-b,c-d which denotes [a,b] and [c,d] - -;; We want to find if [c,d] < [a,b] or vice versa (complete inclusion) -;; and since we're working with integers, it's simply checking if the -;; bounds are included i.e. c in [a,b] and d in [a,b] - -(defvar input (uiop:read-file-string "2022/4-input")) - -(defun parse-bound (str) - "Given STR=\"a-b\" return (a b)" - (let* ((sep (search "-" str)) - (first (subseq str 0 sep)) - (second (subseq str (+ sep 1)))) - (list (parse-integer first) (parse-integer second)))) - -(defvar completed-parse - (with-input-from-string (s input) - (loop for line = (read-line s nil) - until (null line) - collect - ;; given a-b,c-d we want ((a b) (c d)) - (let* ((sep (search "," line)) - (first-bound (subseq line 0 sep)) - (second-bound (subseq line (+ sep 1)))) - (list (parse-bound first-bound) (parse-bound second-bound)))))) - -(defun complete-inclusion (first-bound second-bound) - (destructuring-bind (a b) first-bound - (destructuring-bind (c d) second-bound - (or - (and - (>= a c) (<= a d) - (>= b c) (<= b d)) - (and - (>= c a) (<= c b) - (>= d a) (<= d b)))))) - -(defvar round-1-answer (length (remove-if #'null - (mapcar (lambda (pair) - (destructuring-bind (first second) pair - (complete-inclusion first second))) - completed-parse)))) - -;; Round 2: any overlap at all. Basically just overhaul the inclusion -;; function and then do the same answer checking. -(defun any-inclusion (first second) - (destructuring-bind (a b) first - (destructuring-bind (c d) second - ;; How about doing this through negation? [a,b] does not overlap with [c,d] at all if either b < c or a > d. - (not - (or - (< b c) - (> a d)))))) - -(defvar round-2-answer (length (remove-if #'null - (mapcar (lambda (pair) - (destructuring-bind (first second) pair - (any-inclusion first second))) - completed-parse)))) -- cgit v1.2.3-13-gbd6f