feat: add code for day 1

1/input

@@ -0,0 +1,100 @@
+78207
+89869
+145449
+73634
+78681
+81375
+131482
+126998
+50801
+115839
+77949
+53203
+146099
+56912
+59925
+132631
+115087
+89543
+123234
+108110
+109873
+81923
+124264
+87981
+106554
+147239
+73615
+72609
+129684
+84175
+64915
+98124
+74391
+55211
+120961
+119116
+148275
+89605
+115986
+120547
+50299
+137922
+78906
+145216
+80424
+122610
+61408
+97573
+127533
+116820
+76068
+77400
+117943
+85231
+102442
+62002
+58761
+56479
+98200
+85971
+73985
+88908
+82719
+120604
+83378
+88241
+122574
+76731
+99810
+137548
+102617
+105352
+137585
+83238
+118817
+149419
+107629
+63893
+56049
+70693
+83844
+76413
+87021
+90259
+124289
+102527
+139625
+106607
+120241
+101098
+66142
+96591
+82277
+142297
+116671
+131881
+94861
+79741
+73561
+115214

1/script.rb

@@ -0,0 +1,25 @@
+#!/usr/bin/env ruby
+
+INPUT = __dir__ + '/input'
+
+def part1
+  File.readlines(INPUT).map { |mass| calculate_fuel(mass) }.inject(:+)
+end
+
+def part2
+  File.readlines(INPUT).map { |mass| calculate_total_fuel(mass.to_i) }.inject(:+)
+end
+
+def calculate_total_fuel(mass)
+  fuel = calculate_fuel(mass)
+  fuel > 0 ? fuel + calculate_total_fuel(fuel) : 0
+end
+
+def calculate_fuel(mass)
+  (mass.to_i / 3).floor - 2
+end
+
+puts "=== Part 1 ==="
+puts part1
+puts "=== Part 2 ==="
+puts part2