Welcome everyone to the 2023 advent of code! Thank you all for stopping by and participating in it in programming.dev whether youre new to the event or doing it again.

This is an unofficial community for the event as no official spot exists on lemmy but ill be running it as best I can with Sigmatics modding as well. Ill be running a solution megathread every day where you can share solutions with other participants to compare your answers and to see the things other people come up with


Day 1: Trebuchet?!


Megathread guidelines

  • Keep top level comments as only solutions, if you want to say something other than a solution put it in a new post. (replies to comments can be whatever)
  • Code block support is not fully rolled out yet but likely will be in the middle of the event. Try to share solutions as both code blocks and using something such as https://topaz.github.io/paste/ or pastebin (code blocks to future proof it for when 0.19 comes out and since code blocks currently function in some apps and some instances as well if they are running a 0.19 beta)

FAQ


🔒This post will be unlocked when there is a decent amount of submissions on the leaderboard to avoid cheating for top spots

🔓 Edit: Post has been unlocked after 6 minutes

  • snowe@programming.dev
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    11 months ago

    Ruby

    https://github.com/snowe2010/advent-of-code/blob/master/ruby_aoc/2023/day01/day01.rb

    Part 1

    execute(1, test_file_suffix: "p1") do |lines|
      lines.inject(0) do |acc, line|
        d = line.gsub(/\D/,'')
        acc += (d[0] + d[-1]).to_i
      end
    end
    

    Part 2

    map = {
      "one": 1,
      "two": 2,
      "three": 3,
      "four": 4,
      "five": 5,
      "six": 6,
      "seven": 7,
      "eight": 8,
      "nine": 9,
    }
    
    execute(2) do |lines|
      lines.inject(0) do |acc, line|
        first_num = line.sub(/(one|two|three|four|five|six|seven|eight|nine)/) do |key|
          map[key.to_sym]
        end
        last_num = line.reverse.sub(/(enin|thgie|neves|xis|evif|ruof|eerht|owt|eno)/) do |key|
          map[key.reverse.to_sym]
        end
    
        d = first_num.chars.select { |num| numeric?(num) }
        e = last_num.chars.select { |num| numeric?(num) }
        acc += (d[0] + e[0]).to_i
      end
    end
    

    Then of course I also code golfed it, but didn’t try very hard.

    P1 Code Golf

    execute(1, alternative_text: "Code Golf 60 bytes", test_file_suffix: "p1") do |lines|
      lines.inject(0){|a,l|d=l.gsub(/\D/,'');a+=(d[0]+d[-1]).to_i}
    end
    

    P2 Code Golf (ignore the formatting, I just didn’t want to reformat to remove all the spaces, and it’s easier to read this way.)

    execute(1, alternative_text: "Code Golf 271 bytes", test_file_suffix: "p1") do |z|
      z.inject(0) { |a, l|
        w = %w(one two three four five six seven eight nine)
        x = w.join(?|)
        f = l.sub(/(#{x})/) { |k| map[k.to_sym] }
        g = l.reverse.sub(/(#{x.reverse})/) { |k| map[k.reverse.to_sym] }
        d = f.chars.select { |n| n.match?(/\d/) }
        e = g.chars.select { |n| n.match?(/\d/) }
        a += (d[0] + e[0]).to_i
      }
    end
    
    • cabhan@discuss.tchncs.de
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      11 months ago

      Thank you for sharing this. I also wrote a regular expression with \d|eno|owt and so on, and I was not so proud of myself :). Good to know I wasn’t the only one :).

      • snowe@programming.dev
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        11 months ago

        haha it’s such a dumb solution, but it works. i’ve seen several others that have done the same thing. The alternatives all sounded too hard for my tired brain.

      • stifle867@programming.dev
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        11 months ago

        I was trying so hard to avoid doing this and landed on a pretty nice solution (for me). It’s funny sering everyone’s approach especially when you have no problem running through that barrier that I didn’t want to 😆