first commit

day_01/1.rb

@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+
+class Main
+  def run
+    current = 50
+    count = 0
+
+    $stdin.each_line do |line|
+      direction, magnitude = line[0], line[1..].to_i
+
+      case direction
+      when "R"
+        current = (current + magnitude) % 100
+      when "L"
+        current = (current -= magnitude) % 100
+      end
+
+      if current == 0
+        count += 1
+      end
+    end
+
+    puts count
+  end
+end
+
+Main.new.run

day_01/2.rb

@@ -0,0 +1,32 @@
+#!/usr/bin/env ruby
+
+class Main
+  def run
+    current = 50
+    count = 0
+
+    $stdin.each_line do |line|
+      direction, magnitude = line[0], line[1..].to_i
+
+      loop do
+        case direction
+        when "R"
+          current = (current + 1) % 100
+        when "L"
+          current = (current - 1) % 100
+        end
+
+        if current == 0
+          count += 1
+        end
+
+        magnitude -= 1
+        break if magnitude == 0
+      end
+    end
+
+    puts count
+  end
+end
+
+Main.new.run