--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2020/11.txt Wed Dec 01 21:48:27 2021 -0500
@@ -0,0 +1,91 @@
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--- a/package.lisp Wed Dec 01 20:54:23 2021 -0500
+++ b/package.lisp Wed Dec 01 21:48:27 2021 -0500
@@ -85,6 +85,7 @@
:bisect-integers-right
:print-hash-table-map
+ :print-2d-array
:clear
:green
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2020/days/day-11.lisp Wed Dec 01 21:48:27 2021 -0500
@@ -0,0 +1,57 @@
+(advent:defpackage* :advent/2020/11)
+(in-package :advent/2020/11)
+
+(defun sref (seats row col)
+ (when (array-in-bounds-p seats row col)
+ (aref seats row col)))
+
+(defun count-neighbors (seats row col &aux (result 0))
+ (do-irange ((dr -1 1)
+ (dc -1 1))
+ (unless (= 0 dr dc)
+ (when (eql #\# (sref seats (+ row dr) (+ col dc)))
+ (incf result))))
+ result)
+
+(defun count-visible (seats row col &aux (result 0))
+ (do-irange ((dr -1 1)
+ (dc -1 1))
+ (unless (= 0 dr dc)
+ (iterate (for r :from (+ row dr) :by dr)
+ (for c :from (+ col dc) :by dc)
+ (for ch = (sref seats r c))
+ (ecase ch
+ ((#\L nil) (return))
+ (#\# (progn (incf result) (return)))
+ (#\.)))))
+ result)
+
+(defun simulate (seats &key neighbors crowded)
+ (let ((seats (alexandria:copy-array seats))
+ (next (alexandria:copy-array seats)))
+ (loop (iterate
+ (with changed = nil)
+ (for (current row col) :in-array seats)
+ (unless (char= current #\.)
+ (for n = (funcall neighbors seats row col))
+ (setf (aref next row col)
+ (ecase current
+ (#\L (if (= n 0)
+ (progn (setf changed t) #\#)
+ #\L))
+ (#\# (if (>= n crowded)
+ (progn (setf changed t) #\L)
+ #\#)))))
+ (finally
+ (rotatef seats next)
+ (when (not changed) (return-from simulate seats)))))))
+
+(defun count-total (seats)
+ (iterate (for ch :across-flat-array seats) (counting (char= ch #\#))))
+
+(define-problem (2020 11) (data read-2d-array) (2261 2039)
+ (values (count-total (simulate data :neighbors #'count-neighbors :crowded 4))
+ (count-total (simulate data :neighbors #'count-visible :crowded 5))))
+
+
+#; Scratch --------------------------------------------------------------------
--- a/src/2021/days/day-01.lisp Wed Dec 01 20:54:23 2021 -0500
+++ b/src/2021/days/day-01.lisp Wed Dec 01 21:48:27 2021 -0500
@@ -15,5 +15,3 @@
(counting (> d p)))))
#; Scratch --------------------------------------------------------------------
-
-
--- a/src/utils.lisp Wed Dec 01 20:54:23 2021 -0500
+++ b/src/utils.lisp Wed Dec 01 21:48:27 2021 -0500
@@ -844,6 +844,14 @@
(esc "[0m"))
+(defun print-2d-array (array)
+ (destructuring-bind (rows cols) (array-dimensions array)
+ (dotimes (r rows)
+ (dotimes (c cols)
+ (princ (aref array r c)))
+ (terpri))))
+
+
;;;; A* Search ----------------------------------------------------------------
(defstruct path
state