20 files changed, 240 insertions(+), 10 deletions(-)

R .gitignore => 2019/.gitignore
R days/day1.lisp => 2019/days/day1.lisp
R days/day3.lisp => 2019/days/day3.lisp
R days/day4.lisp => 2019/days/day4.lisp
R days/day6.lisp => 2019/days/day6.lisp
R days/day7.lisp => 2019/days/day7.lisp
R days/day8.lisp => 2019/days/day8.lisp
R inputs/day1-input.txt => 2019/inputs/day1-input.txt
R inputs/day3-input.txt => 2019/inputs/day3-input.txt
R inputs/day3-input2.txt => 2019/inputs/day3-input2.txt
R inputs/day6-input.txt => 2019/inputs/day6-input.txt
R inputs/day7-input.txt => 2019/inputs/day7-input.txt
R inputs/day7-input2.txt => 2019/inputs/day7-input2.txt
R inputs/day8-input.txt => 2019/inputs/day8-input.txt
R intcode.lisp => 2019/intcode.lisp
R package.lisp => 2019/package.lisp
A 2020/days/day1.lisp
A 2020/inputs/day1.txt
A 2020/package.lisp
M advent.asd

@@ 18,4 18,4 @@
   (let ((fuels (read-fuel-file filename)))
     (reduce #'+ (mapcar #'add-fuels fuels))))
 
-(fuel-required "./inputs/day1-input.txt")
+(fuel-required "./2019/inputs/day1-input.txt")

@@ 0,0 1,23 @@
+(in-package #:advent-2020)
+
+(defvar *day1-file* "2020/inputs/day1.txt")
+
+(defun slurp (filename)
+  (mapcar #'parse-integer (uiop:read-file-lines filename)))
+
+(defun is-it-2020?-part-1 ()
+  (let ((numbers (slurp *day1-file*)))
+    (dolist (numi numbers)
+      (dolist (numj numbers)
+        (unless (= numi numj)
+          (when (= 2020 (+ numi numj))
+            (return-from is-it-2020?-part-1 (* numi numj))))))))
+
+(defun is-it-2020?-part-2 ()
+  (let ((numbers (slurp *day1-file*)))
+    (dolist (numi numbers)
+      (dolist (numj numbers)
+        (dolist (numk numbers)
+          (unless (= numi numj numk)
+            (when (= 2020 (+ numi numj numk))
+              (return-from is-it-2020?-part-2 (* numi numj numk)))))))))

@@ 0,0 1,200 @@
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@@ 0,0 1,2 @@
+(defpackage :advent-2020
+  (:use :cl))

@@ 5,12 5,17 @@
   :license  "GPLv3"
   :version "0.0.1"
   :depends-on (:cl-ppcre :bordeaux-threads)
-  :components ((:file "package")
-               (:file "intcode")
-               (:module "days"
-                :components ((:file "day1")
-                             (:file "day3")
-                             (:file "day4")
-                             (:file "day6")
-                             (:file "day7")
-                             (:file "day8")))))
+  :components ((:module "2019"
+                :components ((:file "package")
+                             (:file "intcode")
+                             (:module "days"
+                              :components ((:file "day1")
+                                           (:file "day3")
+                                           (:file "day4")
+                                           (:file "day6")
+                                           (:file "day7")
+                                           (:file "day8")))))
+               (:module "2020"
+                :components ((:file "package")
+                             (:module "days"
+                              :components ((:file "day1")))))))