bismark
Advent Of Code 2022 - Day 4
Took me a minute to remember my binary math 
..
import Bitwise
__DIR__
|> Path.join("puzzle.txt")
|> File.stream!()
|> Stream.filter(fn line ->
line
|> String.trim()
|> String.split(",")
|> Enum.map(fn range ->
[s,e] = range |> String.split("-") |> Enum.map(& String.to_integer(&1))
Integer.pow(2, e - s + 1) - 1 <<< (s - 1)
end)
|> Enum.reduce(fn int1, int2 ->
intersection = int1 ||| int2
intersection == int1 or intersection == int2
end)
end)
|> Enum.count()
|> IO.puts()
import Bitwise
__DIR__
|> Path.join("puzzle.txt")
|> File.stream!()
|> Stream.filter(fn line ->
line
|> String.trim()
|> String.split(",")
|> Enum.map(fn range ->
[s,e] = range |> String.split("-") |> Enum.map(& String.to_integer(&1))
Integer.pow(2, e - s + 1) - 1 <<< (s - 1)
end)
|> Enum.reduce(fn int1, int2 ->
(int1 &&& int2) != 0
end)
end)
|> Enum.count()
|> IO.puts()
Edit: oops, I’m supposed to import not use Bitwise now..
Most Liked
deadbeef
mudasobwa
Creator of Cure
...
|> Enum.map(& &1 |> String.replace("-", "..") |> Code.eval_string() |> elem(0))
and then
|> Enum.map(fn [r1, r2] -> not Range.disjoint?(r1, r2) end)
4
Aetherus
My simple solution:
defmodule Day04 do
def part1(input_path) do
input_path
|> File.stream!()
|> Stream.map(&String.trim/1)
|> Stream.map(&String.split(&1, ~r/\D/, global: true))
|> Stream.map(fn x -> Enum.map(x, &String.to_integer/1) end)
|> Enum.count(fn [start1, end1, start2, end2] ->
(start1 <= start2 and end1 >= end2) or
(start1 >= start2 and end1 <= end2)
end)
end
def part2(input_path) do
input_path
|> File.stream!()
|> Stream.map(&String.trim/1)
|> Stream.map(&String.split(&1, ~r/\D/, global: true))
|> Stream.map(fn x -> Enum.map(x, &String.to_integer/1) end)
|> Enum.count(fn [start1, end1, start2, end2] ->
start1 <= end2 and start2 <= end1
end)
end
end
4
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