From b23b0999d636041a5fe471e1ec460bb00e2e8497 Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Sun, 1 Dec 2019 10:50:27 +0100
Subject: [PATCH] Implement day 1.

---
 2019/inputs/01.txt | 100 +++++++++++++++++++++++++++++++++++++++++++++
 2019/src/day01.cpp |  20 ++++++++-
 2 files changed, 118 insertions(+), 2 deletions(-)
 create mode 100644 2019/inputs/01.txt

diff --git a/2019/inputs/01.txt b/2019/inputs/01.txt
new file mode 100644
index 0000000..940774f
--- /dev/null
+++ b/2019/inputs/01.txt
@@ -0,0 +1,100 @@
+102777
+107296
+131207
+116508
+99009
+120098
+83121
+87846
+126604
+79906
+63668
+143932
+51829
+106383
+121354
+138556
+123426
+111544
+84395
+147066
+61897
+133724
+75867
+106697
+67782
+86191
+50666
+138928
+118740
+136863
+123108
+85168
+138487
+115656
+104811
+114986
+147241
+73860
+99186
+134657
+98379
+59914
+144863
+119851
+82549
+93564
+79437
+70761
+134303
+108109
+116208
+80702
+111018
+131996
+119367
+74305
+65905
+116871
+102184
+101880
+100453
+111281
+103134
+129529
+133885
+76153
+56890
+86262
+52804
+139907
+131360
+80009
+121015
+74438
+54470
+73386
+112961
+116283
+81353
+80610
+142522
+64946
+125652
+61688
+58367
+118930
+89711
+115239
+66403
+92405
+114593
+112818
+75964
+126093
+139781
+144801
+88725
+125958
+116869
+119676
diff --git a/2019/src/day01.cpp b/2019/src/day01.cpp
index c4ff5e4..457d8a8 100644
--- a/2019/src/day01.cpp
+++ b/2019/src/day01.cpp
@@ -1,10 +1,26 @@
 #include <iostream>
 #include "days.hpp"
 
+static inline int required(int weight) {
+	return weight / 3 - 2;
+}
+
 void aoc2019::day01_part1(std::istream &input, std::ostream &output) {
-	output << "Not implemented\n";
+	int total = 0;
+	for (int current; input >> current;) {
+		total += required(current);
+	}
+
+	output << total << std::endl;
 }
 
 void aoc2019::day01_part2(std::istream &input, std::ostream &output) {
-	output << "Not implemented\n";
+	int total = 0;
+	for (int current; input >> current;) {
+		for (int fuel = required(current); fuel > 0; fuel = required(fuel)) {
+			total += fuel;
+		}
+	}
+
+	output << total << std::endl;
 }