commit 457f75706b34cdea7df3379f1bd773fc398e17fd
parent 95ee6b354e650c61002363dafd4421f2df02aa23
Author: Lukas Henkel <lh@entf.net>
Date: Mon, 23 Dec 2024 07:49:23 +0100
Day 23
Diffstat:
| A | input/23.txt | | | 3380 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/day-23.lisp | | | 72 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | t/day-23.lisp | | | 42 | ++++++++++++++++++++++++++++++++++++++++++ |
3 files changed, 3494 insertions(+), 0 deletions(-)
diff --git a/input/23.txt b/input/23.txt
@@ -0,0 +1,3380 @@
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diff --git a/src/day-23.lisp b/src/day-23.lisp
@@ -0,0 +1,72 @@
+(defpackage #:aoc/day-23
+ (:use #:cl #:aoc/utils)
+ (:export #:day-23))
+(in-package #:aoc/day-23)
+
+(defstruct computer
+ name
+ connected)
+
+(defun computer-connected-length (computer)
+ (length (computer-connected computer)))
+
+(defun parse-computers (input)
+ (loop with computers = (make-hash-table :test #'equal)
+ for line = (read-line input nil)
+ until (null line)
+ for dash = (position #\- line)
+ for n-1 = (subseq line 0 dash)
+ for n-2 = (subseq line (1+ dash))
+ for c-1 = (ensure-gethash n-1 computers (make-computer :name n-1))
+ for c-2 = (ensure-gethash n-2 computers (make-computer :name n-2))
+ do (pushnew c-1 (computer-connected c-2))
+ (pushnew c-2 (computer-connected c-1))
+ finally (return (hash-table-values computers))))
+
+(defun clique-equal (clique-1 clique-2)
+ (and (length= clique-1 clique-2)
+ (length= clique-1 (intersection clique-1 clique-2))))
+
+(defun find-cliques (computers)
+ (labels ((%pivot (p x)
+ (let ((all (union p x)))
+ (first (sort all #'> :key #'computer-connected-length))))
+ (%bron-kerbosch2 (r p x)
+ (if (and (null p) (null x))
+ (list r)
+ (loop with u = (%pivot p x)
+ for v in (set-difference p (computer-connected u))
+ for c = (computer-connected v)
+ nconc (%bron-kerbosch2
+ (cons v r)
+ (intersection c p)
+ (intersection c x))))))
+ (remove-duplicates (%bron-kerbosch2 nil computers nil) :test #'clique-equal)))
+
+(defun possible-historian-computer-p (computer)
+ (string-prefix-p "t" (computer-name computer)))
+
+(defun password (computers)
+ (format nil "~{~A~^,~}" (sort (mapcar #'computer-name computers) #'string<)))
+
+(defun day-23 (input)
+ (loop with computers = (parse-computers input)
+ with seen = (make-hash-table :test #'equal)
+ with task-1 = 0
+ with largest-clique-length = 0
+ with largest-clique = nil
+ for clique in (find-cliques computers)
+ for clique-length = (length clique)
+ when (>= clique-length 3)
+ do (map-combinations (lambda (combo)
+ (setf combo (sort combo #'string< :key #'computer-name))
+ (when (and (not (gethash combo seen))
+ (some #'possible-historian-computer-p combo))
+ (incf task-1)
+ (setf (gethash combo seen) t)))
+ clique
+ :length 3)
+ when (> clique-length largest-clique-length)
+ do (setf largest-clique-length clique-length
+ largest-clique clique)
+ finally (return (values task-1 (password largest-clique)))))
diff --git a/t/day-23.lisp b/t/day-23.lisp
@@ -0,0 +1,42 @@
+(defpackage #:aoc-test/day-23
+ (:use #:cl #:lisp-unit2)
+ (:import-from #:aoc/day-23))
+(in-package #:aoc-test/day-23)
+
+(define-test test-day-23
+ ()
+ (multiple-value-bind (task-1 task-2)
+ (aoc:run-day 23 "kh-tc
+qp-kh
+de-cg
+ka-co
+yn-aq
+qp-ub
+cg-tb
+vc-aq
+tb-ka
+wh-tc
+yn-cg
+kh-ub
+ta-co
+de-co
+tc-td
+tb-wq
+wh-td
+ta-ka
+td-qp
+aq-cg
+wq-ub
+ub-vc
+de-ta
+wq-aq
+wq-vc
+wh-yn
+ka-de
+kh-ta
+co-tc
+wh-qp
+tb-vc
+td-yn")
+ (assert= 7 task-1)
+ (assert-string= "co,de,ka,ta" task-2)))
