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-rw-r--r--AoC2022/22/eg-in14
-rw-r--r--AoC2022/22/input202
-rw-r--r--AoC2022/22/solver.lisp105
3 files changed, 321 insertions, 0 deletions
diff --git a/AoC2022/22/eg-in b/AoC2022/22/eg-in
new file mode 100644
index 0000000..8bc2e1e
--- /dev/null
+++ b/AoC2022/22/eg-in
@@ -0,0 +1,14 @@
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diff --git a/AoC2022/22/input b/AoC2022/22/input
new file mode 100644
index 0000000..46bc034
--- /dev/null
+++ b/AoC2022/22/input
@@ -0,0 +1,202 @@
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diff --git a/AoC2022/22/solver.lisp b/AoC2022/22/solver.lisp
new file mode 100644
index 0000000..431158a
--- /dev/null
+++ b/AoC2022/22/solver.lisp
@@ -0,0 +1,105 @@
+(ql:quickload '(fiveam uiop arrows))
+
+(defun parse-instructions (str &optional (start 0))
+ (multiple-value-bind (action str-pos)
+ (case (aref str start)
+ (#\R 'right)
+ (#\L 'left)
+ (t (parse-integer str :start start :junk-allowed t)))
+ (let ((next (or str-pos (1+ start))))
+ (if (= next (length str))
+ (list action)
+ (cons action (parse-instructions str next))))))
+
+(defun create-field (filename)
+ (let* ((data (uiop:read-file-lines filename))
+ (map (butlast data 2))
+ (instructions (car (last data)))
+ (rows (length map))
+ (columns (reduce (lambda (a r) (max a (length r))) map :initial-value 0))
+ (field (make-array (list rows columns) :initial-element nil)))
+ (loop for row in map
+ for i from 0
+ do (loop for entry across row
+ for j from 0
+ do (setf (aref field i j)
+ (ecase entry
+ (#\. 'free)
+ (#\# 'wall)
+ (#\Space nil)))))
+ (values field (parse-instructions instructions))))
+
+
+(defun get-start (field)
+ (loop for i from 0
+ until (aref field 0 i)
+ finally (return i)))
+
+(defstruct state
+ x-pos y-pos direction)
+
+(defun advance (field state)
+ (destructuring-bind (height width) (array-dimensions field)
+ (with-slots (direction x-pos y-pos) state
+ (destructuring-bind (new-x new-y)
+ (ecase direction
+ (north (list x-pos (mod (1- y-pos) height)))
+ (south (list x-pos (mod (1+ y-pos) height)))
+ (east (list (mod (1+ x-pos) width) y-pos))
+ (west (list (mod (1- x-pos) width) y-pos)))
+ (let ((new-state (make-state :x-pos new-x :y-pos new-y :direction direction)))
+ (if (aref field new-y new-x)
+ new-state
+ (advance field new-state)))))))
+
+(defconstant +directions+ #(north east south west))
+
+(defun new-direction (current-direction turn)
+ (svref +directions+
+ (mod
+ (+
+ (ecase turn
+ (left -1)
+ (right 1))
+ (position current-direction +directions+))
+ 4)))
+
+(defun walk (field state steps)
+ (if (zerop steps)
+ state
+ (let ((new-state (advance field state)))
+ (with-slots (x-pos y-pos) new-state
+ (ecase (aref field y-pos x-pos)
+ (free (walk field new-state (1- steps)))
+ (wall state))))))
+
+(fiveam:test preparation
+ (fiveam:is (eq 'south (new-direction 'east 'right)))
+ (fiveam:is (eq 'west (new-direction 'north 'left)))
+ (fiveam:is (equal
+ (parse-instructions "10R5L5R10L4R5L5" )
+ '(10 RIGHT 5 LEFT 5 RIGHT 10 LEFT 4 RIGHT 5 LEFT 5))))
+
+
+(defun decode-state (state)
+ (with-slots (x-pos y-pos direction) state
+ (+ (* 1000 (1+ y-pos))
+ (* 4 (1+ x-pos))
+ (ecase direction
+ (east 0)
+ (south 1)
+ (west 2)
+ (north 3)))))
+
+(defun solver (filename)
+ (multiple-value-bind (field instructions) (create-field filename)
+ (let ((state (make-state :x-pos (get-start field) :y-pos 0 :direction 'east)))
+ (dolist (move instructions)
+ (if (numberp move)
+ (setf state (walk field state move))
+ (setf (state-direction state) (new-direction (state-direction state) move))))
+ (decode-state state))))
+
+(fiveam:test solutions
+ (fiveam:is (= 6032 (solver "eg-in")))
+ (fiveam:is (= 159034 (solver "input"))))