Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

day1 solution #2

Open
wants to merge 4 commits into
base: master
Choose a base branch
from
Open

day1 solution #2

Changes from 1 commit
Commits
Show all changes
4 commits
Select commit Hold shift + click to select a range
ab62979
day1
Sep 24, 2019
306b79e
Trigger Travis
Sep 24, 2019
5a8b4f9
reformat
Sep 24, 2019
eccbf4a
remove unneeded line
Sep 24, 2019
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
26 changes: 13 additions & 13 deletions lib/day1.ex
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -56,18 +56,18 @@ defmodule AocKata.Day1 do
"""
@spec resulting_frequency_fixed(Enumerable.t()) :: integer
def resulting_frequency_fixed(frequency_changes) do
frequency_changes =
Stream.repeatedly(fn -> frequency_changes end)
|> Stream.flat_map(& &1)
|> Stream.cycle()
|> Enum.reduce_while({0, %{0 => true}}, fn change, {frequency, reached_frequencies} ->
frequency = frequency + String.to_integer(change)

if reached_frequencies[frequency] do
{:halt, frequency}
else
{:cont, {frequency, Map.put(reached_frequencies, frequency, true)}}
end
end)
frequency_changes = Stream.repeatedly(fn -> frequency_changes end) |> Stream.flat_map(& &1)

frequency_changes
|> Stream.cycle()
egze marked this conversation as resolved.
Show resolved Hide resolved
|> Enum.reduce_while({0, %{0 => true}}, fn change, {frequency, reached_frequencies} ->
frequency = frequency + String.to_integer(change)

if reached_frequencies[frequency] do
{:halt, frequency}
else
{:cont, {frequency, Map.put(reached_frequencies, frequency, true)}}
end
end)
end
end