ebb7ecd4844f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2016/02.txt	Fri Dec 06 23:50:53 2019 -0500
@@ -0,0 +1,5 @@
+DLRURUDLULRDRUDDRLUUUDLDLDLRLRRDRRRLLLLLDDRRRDRRDRRRLRRURLRDUULRLRRDDLULRLLDUDLULURRLRLDUDLURURLDRDDULDRDRDLDLLULULLDDLRRUDULLUULRRLLLURDRLDDLDDLDRLRRLLRURRUURRRRLUDLRDDDDRDULRLLDDUURDUDRLUDULLUDLUDURRDRDUUUUDDUDLLLRLUULRUURDLRLLRRLRLLDLLRLLRRRURLRRLURRLDLLLUUDURUDDLLUURRDRDRRDLLDDLLRDRDRRLURLDLDRDLURLDULDRURRRUDLLULDUDRURULDUDLULULRRRUDLUURRDURRURRLRRLLRDDUUUUUDUULDRLDLLRRUDRRDULLLDUDDUDUURLRDLULUUDLDRDUUUDDDUDLDURRULUULUUULDRUDDLLLDLULLRLRLUDULLDLLRLDLDDDUUDURDDDLURDRRDDLDRLLRLRR
+RLDUDURDRLLLLDDRRRURLLLRUUDDLRDRDDDUDLLUDDLRDURLDRDLLDRULDDRLDDDRLDRDDDRLLULDURRRLULDRLRDRDURURRDUDRURLDRLURDRLUULLULLDLUDUDRDRDDLDDDDRDURDLUDRDRURUDDLLLRLDDRURLLUDULULDDLLLDLUDLDULUUDLRLURLDRLURURRDUUDLRDDDDDRLDULUDLDDURDLURLUURDLURLDRURRLDLLRRUDRUULLRLDUUDURRLDURRLRUULDDLDLDUUDDRLDLLRRRUURLLUURURRURRLLLUDLDRRDLUULULUDDULLUDRLDDRURDRDUDULUDRLRRRUULLDRDRLULLLDURURURLURDLRRLLLDRLDUDLLLLDUUURULDDLDLLRRUDDDURULRLLUDLRDLUUDDRDDLLLRLUURLDLRUURDURDDDLLLLLULRRRURRDLUDLUURRDRLRUDUUUURRURLRDRRLRDRDULLDRDRLDURDDUURLRUDDDDDLRLLRUDDDDDURURRLDRRUUUDLURUUDRRDLLULDRRLRRRLUUUD
+RDRURLLUUDURURDUUULLRDRLRRLRUDDUDRURLLDLUUDLRLLDDURRURLUDUDDURLURLRRURLLURRUDRUDLDRLLURLRUUURRUDDDURRRLULLLLURDLRLLDDRLDRLLRRDLURDLRDLDUDRUULLDUUUDLURRLLRUDDDUUURLURUUDRLRULUURLLRLUDDLLDURULLLDURDLULDLDDUDULUDDULLRDRURDRRLLDLDDDDRUDLDRRLLLRLLLRRULDLRLRLRLLDLRDRDLLUDRDRULDUURRDDDRLLRLDLDRDUDRULUDRDLDLDDLLRULURLLURDLRRDUDLULLDLULLUDRRDDRLRURRLDUDLRRUUDLDRLRLDRLRRDURRDRRDDULURUUDDUUULRLDRLLDURRDLUULLUDRDDDLRUDLRULLDDDLURLURLRDRLLURRRUDLRRLURDUUDRLRUUDUULLRUUUDUUDDUURULDLDLURLRURLRUDLULLULRULDRDRLLLRRDLU
+RRRRDRLUUULLLRLDDLULRUUURRDRDRURRUURUDUULRULULRDRLRRLURDRRRULUUULRRUUULULRDDLLUURRLLDUDRLRRLDDLDLLDURLLUDLDDRRURLDLULRDUULDRLRDLLDLRULLRULLUDUDUDDUULDLUUDDLUDDUULLLLLURRDRULURDUUUDULRUDLLRUUULLUULLLRUUDDRRLRDUDDRULRDLDLLLLRLDDRRRULULLLDLRLURRDULRDRDUDDRLRLDRRDLRRRLLDLLDULLUDDUDDRULLLUDDRLLRRRLDRRURUUURRDLDLURRDLURULULRDUURLLULDULDUDLLULDDUURRRLDURDLUDURLDDRDUDDLLUULDRRLDLLUDRDURLLDRLDDUDURDLUUUUURRUULULLURLDUUULLRURLLLUURDULLUULDRULLUULRDRUULLRUDLDDLRLURRUUDRLRRRULRUUULRULRRLDLUDRRLL
+ULRLDLLURDRRUULRDUDDURDDDLRRRURLDRUDDLUDDDLLLRDLRLLRRUUDRRDRUULLLULULUUDRRRDRDRUUUUULRURUULULLULDULURRLURUDRDRUDRURURUDLDURUDUDDDRLRLLLLURULUDLRLDDLRUDDUUDURUULRLLLDDLLLLRRRDDLRLUDDUULRRLLRDUDLLDLRRUUULRLRDLRDUDLLLDLRULDRURDLLULLLRRRURDLLUURUDDURLDUUDLLDDRUUDULDRDRDRDDUDURLRRRRUDURLRRUDUDUURDRDULRLRLLRLUDLURUDRUDLULLULRLLULRUDDURUURDLRUULDURDRRRLLLLLUUUULUULDLDULLRURLUDLDRLRLRLRDLDRUDULDDRRDURDDULRULDRLRULDRLDLLUDLDRLRLRUDRDDR

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2016/days/day-02.lisp	Fri Dec 06 23:50:53 2019 -0500
@@ -0,0 +1,62 @@
+(defpackage :advent/2016/02 #.cl-user::*advent-use*)
+(in-package :advent/2016/02)
+
+(defparameter *pad* 1)
+
+(defparameter *pads*
+  #(nil
+    ((#c(-1  1) . #\1)   (#c(0  1) . #\2)   (#c(1  1) . #\3)
+     (#c(-1  0) . #\4)   (#c(0  0) . #\5)   (#c(1  0) . #\6)
+     (#c(-1 -1) . #\7)   (#c(0 -1) . #\8)   (#c(1 -1) . #\9))
+
+    (                                        (#c(0  2) . #\1)
+                         (#c(-1  1) . #\2)   (#c(0  1) . #\3)   (#c(1  1) . #\4)
+     (#c(-2  0) . #\5)   (#c(-1  0) . #\6)   (#c(0  0) . #\7)   (#c(1  0) . #\8)   (#c(2  0) . #\9)
+                         (#c(-1 -1) . #\A)   (#c(0 -1) . #\B)   (#c(1 -1) . #\C)
+                                             (#c(0 -2) . #\D))))
+
+(defun delta (direction)
+  (ecase direction
+    (#\U #c( 0  1))
+    (#\D #c( 0 -1))
+    (#\L #c(-1  0))
+    (#\R #c( 1  0))))
+
+(defun validp (position)
+  (member position (aref *pads* *pad*) :key #'car))
+
+(defun move (position direction)
+  (let ((next (+ position (delta direction))))
+    (if (validp next)
+      next
+      position)))
+
+(defun button (position)
+  (cdr (assoc position (aref *pads* *pad*))))
+
+(defun find-button (directions start)
+  (iterate
+    (for dir :in-string directions)
+    (for pos :seed start :then (move pos dir))
+    (returning (button pos) pos)))
+
+(defun find-code (lines)
+  (iterate
+    (with pos = 0)
+    (for directions :in lines)
+    (for (values button next) = (find-button directions pos))
+    (setf pos next)
+    (collect button :result-type 'string)))
+
+(define-problem (2016 2) (data read-lines) ("95549" "D87AD")
+  (values (let ((*pad* 1)) (find-code data))
+          (let ((*pad* 2)) (find-code data))))
+
+#; Scratch --------------------------------------------------------------------
+
+(run '("ULL"
+       "RRDDD"
+       "LURDL"
+       "UUUUD"))
+
+(run '("LURDL"))

--- a/src/2018/days/day-10.lisp	Fri Dec 06 23:23:26 2019 -0500
+++ b/src/2018/days/day-10.lisp	Fri Dec 06 23:50:53 2019 -0500
@@ -1,5 +1,5 @@
 (defpackage :advent/2018/10 #.cl-user::*advent-use*
-  (:shadow :x))
+  (:shadow :x :y))
 (in-package :advent/2018/10)
 
 (defun parse-line (line)