From 85fa12da3382138518c24a84ede495cd897c3218 Mon Sep 17 00:00:00 2001
From: Vincent Ambo <tazjin@google.com>
Date: Mon, 9 Dec 2019 14:43:01 +0000
Subject: feat(aoc2019): Solve day 1 puzzles

---
 tools/aoc2019/solution-day1.el | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 tools/aoc2019/solution-day1.el

diff --git a/tools/aoc2019/solution-day1.el b/tools/aoc2019/solution-day1.el
new file mode 100644
index 000000000000..d805c22ec870
--- /dev/null
+++ b/tools/aoc2019/solution-day1.el
@@ -0,0 +1,28 @@
+;; Advent of Code 2019 - Day 1
+(require 'dash)
+
+;; Puzzle 1:
+
+(defvar day-1/input
+  '(83285 96868 121640 51455 128067 128390 141809 52325 68310 140707 124520 149678
+          87961 52040 133133 52203 117483 85643 84414 86558 65402 122692 88565 61895
+          126271 128802 140363 109764 53600 114391 98973 124467 99574 69140 144856
+          56809 149944 138738 128823 82776 77557 51994 74322 64716 114506 124074
+          73096 97066 96731 149307 135626 121413 69575 98581 50570 60754 94843 72165
+          146504 53290 63491 50936 79644 119081 70218 85849 133228 114550 131943
+          67288 68499 80512 148872 99264 119723 68295 90348 146534 52661 99146 95993
+          130363 78956 126736 82065 77227 129950 97946 132345 107137 79623 148477
+          88928 118911 75277 97162 80664 149742 88983 74518))
+
+(defun calculate-fuel (mass)
+  (- (/ mass 3) 2))
+
+(message "Solution to day1/1: %d" (apply #'+ (-map #'calculate-fuel day-1/input)))
+
+;; Puzzle 2:
+(defun calculate-recursive-fuel (mass)
+  (let ((fuel (calculate-fuel mass)))
+    (if (< fuel 0) 0
+      (+ fuel (calculate-recursive-fuel fuel)))))
+
+(message "Solution to day1/2: %d" (apply #'+ (-map #'calculate-recursive-fuel day-1/input)))
-- 
cgit 1.4.1