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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/2020/12.txt	Sun Dec 05 11:43:05 2021 -0500
@@ -0,0 +1,787 @@
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/2020/days/day-12.lisp	Sun Dec 05 11:43:05 2021 -0500
@@ -0,0 +1,49 @@
+(advent:defpackage* :advent/2020/12)
+(in-package :advent/2020/12)
+
+(defun parse (stream)
+  (iterate (for line :in-stream stream :using #'read-line)
+           (ppcre:register-groups-bind (ch n)
+               ("([NSEWLRF])([0-9]+)" line)
+             (collect (cons (char ch 0) (parse-integer n))))))
+
+(defun north (n) (* n #c( 0  1)))
+(defun south (n) (* n #c( 0 -1)))
+(defun east  (n) (* n #c( 1  0)))
+(defun west  (n) (* n #c(-1  0)))
+(defun rot   (n) (expt #c(0 1) (/ n 90)))
+
+(defun part1 (path)
+  (iterate (with pos = #c(0 0))
+           (with heading = #c(1 0))
+           (for (action . n) :in path)
+           (ecase action
+             (#\N (incf pos (north n)))
+             (#\S (incf pos (south n)))
+             (#\E (incf pos (east n)))
+             (#\W (incf pos (west n)))
+             (#\L (mulf heading (rot n)))
+             (#\R (divf heading (rot n)))
+             (#\F (incf pos (* heading n))))
+           (returning pos)))
+
+(defun part2 (path)
+  (iterate (with waypoint = #c(10 1))
+           (with pos = #c(0 0))
+           (for (action . n) :in path)
+           (ecase action
+             (#\N (incf waypoint (north n)))
+             (#\S (incf waypoint (south n)))
+             (#\E (incf waypoint (east n)))
+             (#\W (incf waypoint (west n)))
+             (#\L (mulf waypoint (rot n)))
+             (#\R (divf waypoint (rot n)))
+             (#\F (incf pos (* waypoint n))))
+           (returning pos)))
+
+(define-problem (2020 12) (data parse) (1106 107281)
+  (values (manhattan-distance (part1 data))
+          (manhattan-distance (part2 data))))
+
+
+#; Scratch --------------------------------------------------------------------