(1|2)+lisp files for puzzles 1 and 2

Includes code for both rounds, separated by comments.

1 files changed, 26 insertions, 0 deletions

diff --git a/puzzle-1.lisp b/puzzle-1.lisp
new file mode 100644
index 0000000..45d1921
--- /dev/null
+++ b/puzzle-1.lisp
@@ -0,0 +1,26 @@
+(defvar input (uiop:read-file-string "puzzle-1-input.txt"))
+(defvar *sep (format nil "~%~%"))
+
+(defun get-lists (input)
+  (let ((pos (search *sep input)))
+    (with-input-from-string (s (subseq input 0 pos))
+      (let ((converted
+              (loop
+                for line = (read-line s nil nil)
+                while line
+                collect (parse-integer line))))
+        (if (null pos)
+            (list converted)
+            (cons converted
+                  (get-lists (subseq input (+ pos 2)))))))))
+
+(defvar sums (sort (mapcar (lambda (lst) (reduce #'+ lst)) (get-lists input)) #'>))
+
+;; First challenge
+(format t "Top snacks: ~a" (car sums))
+
+;; Second challenge
+(let ((first (car sums))
+      (second (car (cdr sums)))
+      (third (car (cdr (cdr sums)))))
+  (format t "~a,~a,~a:>~a" first second third (+ first second third)))