Note: This topic is to talk about Day 7 of the Advent of Code 2019 . There is a private leaderboard for elixirforum members. You can join it by following this link and entering the following code: 39276-eeb74f9a

Part 1 was real easy, even though I haven’t bothered to fix up my Intcode computer like some of ya’ll have. Part 2 actually wasn’t difficult either (just have to save state), except that both of the examples did not halt for me. After a while, I gave up trying to fix them and just ran the actual in…

Very nice, super clean. I did want to try processes + messages, which would have been the Elixir/Erlang way, but I am just not that comfortable with all that stuff yet.

Here is my solution . In part 1, I spent a significant amount of the time to implement my permutations function to lazily generate all phases. In part 2, I spent some time before I realized that it would have been much easier to run each of the amplifiers in their own Erlang process and rewrite inp…

This was a fun challenge! My solution is completely sequential. I solved part 1 as a special case of part 2. [image] bjorng: implement my permutations function to lazily generate all phases. Nice! I also went for lazy permutation. Here ’s my approach.

Here are my solutions (though I am currently refactoring them, they will probably change). I am using advent of code to specifically learn Elixir (started using it like 4 days ago), it’s great to have other solutions to compare against. In part 1 I basically just ran the intcode interpreters serial…

lib/day7.ex master defmodule AdventOfCode2019.Day7 do @moduledoc """ Day 7 solutions """ @doc """ Solves the first riddle of day 7. ## Examples iex> AdventOfCode2019.Day7.part1("3,15,3,16,1002,16,10,16,1,16,15,15,4,15,99,0,0") 43210 iex> AdventOfCode2…

I finished the puzzle with a serially version , as I did in day 5 and day 2, at first. But while writing the code I had strong feelings that this is the perfect scenario for Process to shine. So I refactor it into a new version with spawn and Process. The Intcode program interpreter is now more real…

Wow it was tough but quite entertaining! :laughing: I wrote it the messaging way, spawning exactly 600 processes : 1 task for each of the 120 signal permutations, each task was itself running 5 processes (one per amplifier). Running part2 puzzle takes exactly 91ms on my laptop …

Here’s mine: solution , vm . I’ve opted to put the vm into a process so I can interact with it moving forward. I don’t think this is necessarily a great design but it works and I’ve hit my hour time limit for today’s problem.

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Advent of Code 2019 - Day 7

Learning Resources Coding Challenges

QuinnWilton December 7, 2019, 6:39am 2

Here’s my solution: day7.ex · GitHub