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Well some of us wanted a difficulty spike - and today we got one :sweat_smile:
https://github.com/sevenseacat/advent_of_code/blob/main/l...
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“When in doubt, use brute force.” – Ken Thompson
defmodule Day02 do
def part1(input) do
solve(input, &invalid_part1?/1)
end
...
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We were all waiting for a (more) complex problem, and here it is, finally! As of now, it’s the only problem that has 3x more people who o...
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Part 1 took much more time than part 2. I started out by reusing my grid parsing function from day 4 and start coding before I had fully ...
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Easy puzzles two days in a row. I suspect tomorrow’s puzzle will not be that easy…
defmodule Day05 do
def part1(input) do
{ranges,...
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defmodule Day04 do
def part1(input) do
grid = parse(input)
Enum.count(removable(grid))
end
def part2(input) do
grid = ...
New
defmodule Day06 do
def part1(input) do
input
|> Enum.map(fn line ->
line
|> String.split(" ", trim: true)
...
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Nice little problem. The right data structure is half the solution!
defmodule Y2025.Day08 do
def pairs(enum) do
l = enum |> Enu...
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defmodule Day12 do
def part1(input) do
{presents, regions} = parse(input)
regions
|> Enum.reject(fn region ->
...
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Graph traversals
Parse
graph =
puzzle_input
|> String.split("\n", trim: true)
|> Map.new(fn <<from::binary-3>> ...
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