Day 1 solution

.vscode/launch.json

@@ -0,0 +1,25 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "ruby_lsp",
+      "name": "Debug script",
+      "request": "launch",
+      "program": "ruby ${file}"
+    },
+    {
+      "type": "ruby_lsp",
+      "name": "Debug test",
+      "request": "launch",
+      "program": "ruby -Itest ${relativeFile}"
+    },
+    {
+      "type": "ruby_lsp",
+      "name": "Attach debugger",
+      "request": "attach"
+    }
+  ]
+}

Gemfile

@@ -6,4 +6,3 @@ gem 'debug'
 gem 'minitest'
 gem 'rake'
 gem 'rubocop'
-gem 'solargraph'

Gemfile.lock

@@ -2,29 +2,16 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
-    backport (1.2.0)
-    benchmark (0.3.0)
     debug (1.8.0)
       irb (>= 1.5.0)
       reline (>= 0.3.1)
-    diff-lcs (1.5.0)
-    e2mmap (0.1.0)
     io-console (0.6.0)
     irb (1.9.1)
       rdoc
       reline (>= 0.3.8)
-    jaro_winkler (1.5.6)
     json (2.7.0)
-    kramdown (2.4.0)
-      rexml
-    kramdown-parser-gfm (1.1.0)
-      kramdown (~> 2.0)
     language_server-protocol (3.17.0.3)
     minitest (5.20.0)
-    nokogiri (1.15.5-arm64-darwin)
-      racc (~> 1.4)
-    nokogiri (1.15.5-x64-mingw-ucrt)
-      racc (~> 1.4)
     parallel (1.23.0)
     parser (3.2.2.4)
       ast (~> 2.4.1)
@@ -34,14 +21,11 @@ GEM
     racc (1.7.3)
     rainbow (3.1.1)
     rake (13.1.0)
-    rbs (2.8.4)
-    rdoc (6.6.0)
+    rdoc (6.4.0)
       psych (>= 4.0.0)
     regexp_parser (2.8.2)
     reline (0.4.1)
       io-console (~> 0.5)
-    reverse_markdown (2.1.1)
-      nokogiri
     rexml (3.2.6)
     rubocop (1.58.0)
       json (~> 2.3)
@@ -57,27 +41,8 @@ GEM
     rubocop-ast (1.30.0)
       parser (>= 3.2.1.0)
     ruby-progressbar (1.13.0)
-    solargraph (0.49.0)
-      backport (~> 1.2)
-      benchmark
-      bundler (~> 2.0)
-      diff-lcs (~> 1.4)
-      e2mmap
-      jaro_winkler (~> 1.5)
-      kramdown (~> 2.3)
-      kramdown-parser-gfm (~> 1.1)
-      parser (~> 3.0)
-      rbs (~> 2.0)
-      reverse_markdown (~> 2.0)
-      rubocop (~> 1.38)
-      thor (~> 1.0)
-      tilt (~> 2.0)
-      yard (~> 0.9, >= 0.9.24)
     stringio (3.1.0)
-    thor (1.3.0)
-    tilt (2.3.0)
     unicode-display_width (2.5.0)
-    yard (0.9.34)
 
 PLATFORMS
   arm64-darwin-21
@@ -88,7 +53,6 @@ DEPENDENCIES
   minitest
   rake
   rubocop
-  solargraph
 
 BUNDLED WITH
    2.3.22

Rakefile

@@ -48,7 +48,7 @@ namespace :download do
     puts "⬇️ Download day #{number} input"
 
     response = Net::HTTP.get_response(
-      URI("https://adventofcode.com/2022/day/#{number}/input"),
+      URI("https://adventofcode.com/2023/day/#{number}/input"),
       { 'Cookie' => "session=#{File.read(session_path)}" }
     )
 

examples/01_a.txt

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet

examples/01_b.txt

@@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen

lib/days/01.rb

@@ -1,11 +1,24 @@
 class Day01
 
   def part1(input)
-    'TODO'
+    input.split("\n").map do |line|
+      nums = line.chars.grep(/\d/)
+      (nums.first + nums.last).to_i
+    end.sum
   end
 
+  DIGITS = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'].freeze
+
   def part2(input)
-    'TODO'
+    regex = Regexp.new("(?=(#{DIGITS.join('|')}|\\d))")
+
+    input.split("\n").map do |line|
+      nums = line.scan(regex).flatten.map do |m|
+        DIGITS.include?(m) ? DIGITS.index(m) : m
+      end
+
+      "#{nums.first}#{nums.last}".to_i
+    end.sum
   end
 
 end

template/test

@@ -1,4 +1,5 @@
 require 'minitest/autorun'
+require 'minitest/pride'
 require_relative '../app'
 
 class TestDay{DAY_NUMBER} < Minitest::Test

test/01_test.rb

@@ -1,17 +1,19 @@
 require 'minitest/autorun'
+require 'minitest/pride'
 require_relative '../app'
 
 class TestDay01 < Minitest::Test
   def setup
-    @data = File.read(File.join(APP_ROOT, 'examples', '01.txt')).rstrip
+    @data_a = File.read(File.join(APP_ROOT, 'examples', '01_a.txt')).rstrip
+    @data_b = File.read(File.join(APP_ROOT, 'examples', '01_b.txt')).rstrip
     @day = Day01.new
   end
 
   def test_part1
-    assert_equal @day.part1(@data), ''
+    assert_equal @day.part1(@data_a), 142
   end
 
   def test_part2
-    assert_equal @day.part2(@data), ''
+    assert_equal @day.part2(@data_b), 281
   end
 end