solve day 17 part 1

3 files changed, 92 insertions, 0 deletions

diff --git a/AoC2022/17/eg-in b/AoC2022/17/eg-in
new file mode 100644
index 0000000..97a1aa1
--- /dev/null
+++ b/AoC2022/17/eg-in
@@ -0,0 +1 @@
+>>><<><>><<<>><>>><<<>>><<<><<<>><>><<>>
diff --git a/AoC2022/17/input b/AoC2022/17/input
new file mode 100644
index 0000000..5ec90a1
--- /dev/null
+++ b/AoC2022/17/input
@@ -0,0 +1 @@
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diff --git a/AoC2022/17/solver.lisp b/AoC2022/17/solver.lisp
new file mode 100644
index 0000000..0be6c02
--- /dev/null
+++ b/AoC2022/17/solver.lisp
@@ -0,0 +1,90 @@
+(ql:quickload '(:fiveam :uiop :arrows))
+
+(defparameter *chamber-width* 7)
+
+(defun point (x y)
+  (+ x (* y *chamber-width*)))
+
+(defun coords (point)
+  (floor point *chamber-width*))
+
+(defparameter *rocks*
+  (vector (list (point 0 0) (point 1 0) (point 2 0) (point 3 0))
+          (list (point 1 0)
+                (point 0 1) (point 1 1) (point 2 1)
+                (point 1 2))
+          (list (point 0 0) (point 1 0) (point 2 0)
+                (point 2 1)
+                (point 2 2))
+          (list (point 0 0) (point 0 1) (point 0 2) (point 0 3))
+          (list (point 0 0) (point 1 0)
+                (point 0 1) (point 1 1))))
+
+(defun left (point) (1- point))
+(defun right (point) (1+ point))
+(defun down (point) (- point *chamber-width*))
+
+(defun no-collision-move (object direction obstacles)
+  (mapcar
+   (lambda (current)
+     (let ((next (funcall
+                  (ecase direction
+                    (#\> #'right)
+                    (#\< #'left)
+                    (#\v #'down))
+                  current)))
+       (multiple-value-bind (y2 x2) (coords next)
+         (and (>= y2 0)
+              ;; no rolling boundaries
+              (multiple-value-bind (y x) (coords current)
+                (= 1 (+ (abs (- x x2)) (abs (- y y2)))))
+              (not (member next obstacles :test #'=))
+              next))))
+   object))
+
+(defun gen-object (seq)
+  (let ((len (length seq))
+        (index 0))
+    (lambda ()
+      (prog1 (aref seq index)
+        (setf index (mod (1+ index) len))))))
+
+(defun place-rock (rock highpoint)
+  (let ((left-pad 2))
+    (mapcar (lambda (point) (+ point left-pad (* *chamber-width* highpoint))) rock)))
+
+(defun advance (chamber next-move rock)
+  (let ((next-place (no-collision-move rock next-move chamber)))
+    (if (every #'integerp next-place)
+        next-place rock)))
+
+(defun next-move (chamber next-move rock)
+  (let* ((shift (advance chamber next-move rock))
+         (drop (advance chamber #\v shift)))
+    (values drop (equal shift drop))))
+
+(defun simulate (chamber rock next-shift)
+  (multiple-value-bind (new-place done-falling-p)
+      (next-move chamber (funcall next-shift) rock)
+    (if done-falling-p
+        (append new-place chamber)
+        (simulate chamber new-place next-shift))))
+
+(defun highpoint (obstacles)
+  (1+ (coords (reduce #'max obstacles))))
+
+(defun solver (drops-left highpoint obstacles next-rock next-shift)
+  (if (zerop drops-left)
+      (values highpoint obstacles)
+      (let ((obstacles (simulate obstacles
+                                 (place-rock (funcall next-rock) (+ highpoint 3))
+                                 next-shift)))
+        (solver (1- drops-left) (highpoint obstacles) obstacles next-rock next-shift))))
+
+(fiveam:test solutions
+  (fiveam:is
+   (= 3068 (solver 2022 0 nil (gen-object *rocks*) (gen-object (uiop:read-file-line "eg-in")))))
+  (fiveam:is
+   (= 3141 (solver 2022 0 nil (gen-object *rocks*) (gen-object (uiop:read-file-line "input"))))))
+
+;; (print (solver 1000000000000 0 nil (gen-object *rocks*) (gen-object (uiop:read-file-line "eg-in"))))