feat: Day 2

puzzles/02_1/main.rb

@@ -0,0 +1,19 @@
+def run(f)
+    horizontal = 0
+    depth = 0
+
+    f.each do |line|
+        command, distance = line.split(' ')
+        distance = Integer(distance)
+        case command
+        when 'forward'
+            horizontal += distance
+        when 'down'
+            depth += distance
+        when 'up'
+            depth -= distance
+        end
+    end
+
+    return horizontal * depth
+end

puzzles/02_2/main.rb

@@ -0,0 +1,21 @@
+def run(f)
+    horizontal = 0
+    depth = 0
+    aim = 0
+
+    f.each do |line|
+        command, distance = line.split(' ')
+        distance = Integer(distance)
+        case command
+        when 'forward'
+            horizontal += distance
+            depth += (aim * distance)
+        when 'down'
+            aim += distance
+        when 'up'
+            aim -= distance
+        end
+    end
+
+    return horizontal * depth
+end

run.rb

@@ -5,7 +5,13 @@ part = ARGV[1] ? ARGV[1] : '1'
 
 require './puzzles/%s_%s/main.rb' % [puzzle, part]
 
-f = File.open('./puzzles/%s_%s/input.txt' % [puzzle, part], 'r')
+if part == '1'
+    f = File.open('./puzzles/%s_%s/input.txt' % [puzzle, part], 'r')
+elsif File.exists?('./puzzles/%s_%s/input.txt' % [puzzle, part])
+    f = File.open('./puzzles/%s_%s/input.txt' % [puzzle, part], 'r')
+else
+    f = File.open('./puzzles/%s_1/input.txt' % [puzzle, part], 'r')
+end
 
 res = run f
 puts "Result: " + res.to_s