first commit

.gitignore

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+# Generated by ignr: github.com/onyx-and-iris/ignr
+
+## Ruby ##
+*.gem
+*.rbc
+/.config
+/coverage/
+/InstalledFiles
+/pkg/
+/spec/reports/
+/spec/examples.txt
+/test/tmp/
+/test/version_tmp/
+/tmp/
+
+# Used by dotenv library to load environment variables.
+# .env
+
+# Ignore Byebug command history file.
+.byebug_history
+
+## Specific to RubyMotion:
+.dat*
+.repl_history
+build/
+*.bridgesupport
+build-iPhoneOS/
+build-iPhoneSimulator/
+
+## Specific to RubyMotion (use of CocoaPods):
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# vendor/Pods/
+
+## Documentation cache and generated files:
+/.yardoc/
+/_yardoc/
+/doc/
+/rdoc/
+
+## Environment normalization:
+/.bundle/
+/vendor/bundle
+/lib/bundler/man/
+
+# for a library or gem, you might want to ignore these files since the code is
+# intended to run in multiple environments; otherwise, check them in:
+# Gemfile.lock
+# .ruby-version
+# .ruby-gemset
+
+# unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
+.rvmrc
+
+# Used by RuboCop. Remote config files pulled in from inherit_from directive.
+# .rubocop-https?--*
+
+# End of ignr
+
+*.txt

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "standard", "~> 1.31"

day_01/1.rb

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+#!/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

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+#!/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