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Name: Advent of Code 2019 - Day 02
Uploaded: 2019-12-02T17:12:18Z
Description: My solution, in Erlang: [Advent of Code 2019 - Day 02]

[image] alvises: What the score is based on? We have n users in the group, so a star is up to n points worth. The mth person that gets a star will receive n-m+1 points, as there are 2 stars per day, max score per day is 2 * n. So full score for the first person, one point less for the secon…

Yeah for sure. I didn’t spend much time optimizing since its still a pretty low set of inputs and the algorithm is O(n).

My solution: defmodule GravAssist do def calc([op, _, _ | rest], a \\ 12, b \\ 2) do hd(execute([op, a, b | rest])) end def execute(bytecode) when is_list(bytecode), do: execute(:array.from_list(bytecode)) def execute(bytecode), do: eval(bytecode, 0) defp eval(bytecode, ic) do c…

Good idea. I have edited the first post.

I went pretty naive with my solution: https://github.com/sb8244/advent-of-code-2019/blob/master/lib/two.ex I’m going for speed to solve (124 pt 2), so end up with whatever popped in my head first. I am surprised with whatever I did that caused part 2 to solve in < 500ms though, given what I’ve hear…

My solution, in Erlang: [Advent of Code 2019 - Day 02]

Thanks for sharing your solutions here :slight_smile: I got part 2 down to about 50ms on my machine after removing a stupid misstake where I was executing the “program” twice for every multiplication.. I came up with more or less the same solution as you guys did :slight_smile:

I need to look at some of the other solutions posted but my first go at it is at https://github.com/simon-wolf/advent-of-code-2019/tree/master/day_02 As ever I tend to veer towards verbosity but hopefully readability. I still have an awful lot to learn about constructing efficient algorithms.

Usually I just hack some code together, hopefully fast enough to fit lunchtime, only if it’s taking longer than a couple of seconds on the computer I’m doing the exercises on, I try to optimise in the afternoon after office hours and when the kids are in bed. But the primary goal is just to get tho…