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-rw-r--r--AoC2022/18/solver.lisp15
1 files changed, 10 insertions, 5 deletions
diff --git a/AoC2022/18/solver.lisp b/AoC2022/18/solver.lisp
index 778843d..91397ec 100644
--- a/AoC2022/18/solver.lisp
+++ b/AoC2022/18/solver.lisp
@@ -39,17 +39,22 @@
(defconstant +neighbor-dirs+ '((1 0 0) (0 1 0) (0 0 1)
(-1 0 0) (0 -1 0) (0 0 -1)))
-(defun spread-steam (next outer-region cubes min-point max-point)
+(defun spread-steam (next allowedp)
(loop for dir in +neighbor-dirs+
for nbg = (mapcar #'+ next dir)
- when (and (every #'<= min-point nbg max-point)
- (not (member nbg cubes :test #'equal))
- (not (member nbg outer-region :test #'equal)))
+ when (funcall allowedp nbg)
collect nbg))
+(defun available-p (cubes min-point max-point)
+ (lambda (point)
+ (and (every #'<= min-point point max-point)
+ (not (member point cubes :test #'equal)))))
+
(defun fill-outside (queue outer-region cubes min-point max-point)
(reduce (lambda (out voxel)
- (let ((next-queue (spread-steam voxel out cubes min-point max-point)))
+ (let ((next-queue (spread-steam voxel
+ (available-p
+ (append out cubes) min-point max-point))))
(fill-outside next-queue
(append next-queue out)
cubes min-point max-point)))