Add 2019 day 8 solutionsHEADmaster

2 files changed, 52 insertions, 0 deletions

diff --git a/2019/08/puzzle-1.el b/2019/08/puzzle-1.el
new file mode 100644
index 0000000..ad82334
--- /dev/null
+++ b/2019/08/puzzle-1.el
@@ -0,0 +1,25 @@
+;;; -*- lexical-binding: t; -*-
+
+(defun main (filename)
+  (with-temp-buffer
+    (insert-file-contents-literally filename)
+    (let* ((width 25)
+           (height 6)
+           (area (* width height))
+           (min-zeros most-positive-fixnum)
+           answer)
+      (while (not (eobp))
+        (let* ((end (+ (point) area))
+               (string (buffer-substring (point) end))
+               (zeros (seq-count (make-= ?0) string)))
+          (when (< zeros min-zeros)
+            (setq min-zeros zeros
+                  answer (* (seq-count (make-= ?1) string)
+                            (seq-count (make-= ?2) string))))
+          (goto-char end)))
+      answer)))
+
+(defun make-= (x)
+  (lambda (y) (= x y)))
+
+(message "%d" (main "input"))
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diff --git a/2019/08/puzzle-2.el b/2019/08/puzzle-2.el
new file mode 100644
index 0000000..61eed93
--- /dev/null
+++ b/2019/08/puzzle-2.el
@@ -0,0 +1,27 @@
+;;; -*- lexical-binding: t; -*-
+
+(defun main (filename)
+  (let* ((string (with-temp-buffer
+                   (insert-file-contents-literally filename)
+                   (buffer-substring-no-properties (point-min) (point-max))))
+         (width 25)
+         (height 6)
+         (area (* width height))
+         (image (thread-last
+                  (seq-partition string area)
+                  (apply #'seq-mapn #'first-visible-pixel)
+                  (apply #'string))))
+    (switch-to-buffer "*Advent of Code — 2019 Day 8*")
+    (save-excursion
+      (insert image))
+    (while (not (eobp))
+      (goto-char (+ (point) width))
+      (insert ?\n))))
+
+(defun first-visible-pixel (&rest pixels)
+  (pcase (seq-find (lambda (x) (/= x ?2)) pixels ?2)
+    (?0 ?.)
+    (?1 ?#)
+    (?2 32)))
+
+(main "input")
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