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-rw-r--r--AoC2022/08/solver.lisp61
1 files changed, 28 insertions, 33 deletions
diff --git a/AoC2022/08/solver.lisp b/AoC2022/08/solver.lisp
index e3b63e5..9031e19 100644
--- a/AoC2022/08/solver.lisp
+++ b/AoC2022/08/solver.lisp
@@ -1,11 +1,16 @@
(ql:quickload '(fiveam uiop))
-(defun coord (width height)
+(defun coord-x-minor (width height)
(lambda (x y)
(when (and (< -1 x width)
(< -1 y height))
(+ x (* y width)))))
+(defun coord-y-minor (width height)
+ (let ((xminor (coord-x-minor width height)))
+ (lambda (y x)
+ (funcall xminor x y))))
+
(let* ((data (uiop:read-file-lines "input"))
(width (length (car data)))
(height (length data))
@@ -14,37 +19,27 @@
(mapcan (lambda (row)
(map 'list (lambda (x) (- (char-code x) 48)) row)) data)))
(visibility-mask (make-array (* width height) :initial-element nil))
- (location (coord width height)))
- (dotimes (y height)
- ;; left watch
- (loop
- for x from 0 below width
- for maxh = -1 then (max maxh tree-height)
- for tree-height = (aref forest-arr (funcall location x y))
- when (> tree-height maxh)
- do (setf (aref visibility-mask (funcall location x y)) t))
- ;; right watch
- (loop
- for x downfrom (1- width) to 0
- for maxh = -1 then (max maxh tree-height)
- for tree-height = (aref forest-arr (funcall location x y))
- when (> tree-height maxh)
- do (setf (aref visibility-mask (funcall location x y)) t)))
+ (location-x (coord-x-minor width height))
+ (location-y (coord-y-minor width height))
+ )
+ (flet ((toggle-visibility (major minor location reverse)
+ (dotimes (m major)
+ (let ((range (loop for i below minor collect i)))
+ (loop
+ for n in (if reverse (nreverse range) range)
+ for maxh = -1 then (max maxh tree-height)
+ for tree-height = (aref forest-arr (funcall location n m))
+ when (> tree-height maxh)
+ do (setf (aref visibility-mask (funcall location n m)) t))))))
+ (toggle-visibility height width location-x nil)
+ (toggle-visibility height width location-x t)
+ (toggle-visibility width height location-y nil)
+ (toggle-visibility width height location-y t)
+ )
+
+
- (dotimes (x width)
- ;; top watch
- (loop
- for y from 0 below height
- for maxh = -1 then (max maxh tree-height)
- for tree-height = (aref forest-arr (funcall location x y))
- when (> tree-height maxh)
- do (setf (aref visibility-mask (funcall location x y)) t))
- ;; bottom watch
- (loop
- for y downfrom (1- height) to 0
- for maxh = -1 then (max maxh tree-height)
- for tree-height = (aref forest-arr (funcall location x y))
- when (> tree-height maxh)
- do (setf (aref visibility-mask (funcall location x y)) t)))
- (loop for v across visibility-mask counting v))
+ (loop for v across visibility-mask counting v)
+ ;; visibility-mask
+ )