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look_and_say = fn x -> | |
{str, last_digit, count} = Enum.reduce(String.codepoints(x), {"", "", 0}, fn digit, {total, last_digit, count} -> | |
if digit != last_digit and count != 0 do | |
{total <> to_string(count) <> last_digit, digit, 1} | |
else | |
{total, digit, count + 1} | |
end | |
end) | |
str <> to_string(count) <> last_digit | |
end |
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defmodule PasswordGen do | |
import String, only: [rjust: 3, contains?: 2] | |
def get_password_stream(start) do | |
Stream.unfold(start, fn password -> | |
char_list = to_char_list(password) |> Enum.reverse | |
{new_char_list, _} = Enum.map_reduce(char_list, :continue, fn(c, status) -> | |
cond do | |
status == :done -> {c, status} | |
c == ?z -> {'a', :continue} | |
c in [?h, ?n, ?k] -> {c + 2, :done} |
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defmodule Deer do | |
def loop({name, speed, fly_time, rest_time}) do | |
state = %{rest_time_left: 0, fly_time_left: fly_time, distance: 0, status: :flying, points: 0} | |
loop({name, speed, fly_time, rest_time}, state) | |
end | |
defp loop({name, speed, fly_time, rest_time}, state) do | |
receive do | |
:tick -> | |
case state.status do |
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values = Enum.reduce(File.stream!("input.txt"), [], fn line, acc -> | |
[_, _, a, _, _, b, _, _, c, _, _, d, _, _, e | _] = String.split(line, [" ", ",", "\n"]) | |
acc ++ [[String.to_integer(a), String.to_integer(b), String.to_integer(c), String.to_integer(d), String.to_integer(e)]] | |
end) | |
[a1, a2, a3, a4, a5] = Enum.at(values, 0) | |
[b1, b2, b3, b4, b5] = Enum.at(values, 1) | |
[c1, c2, c3, c4, c5] = Enum.at(values, 2) | |
[d1, d2, d3, d4, d5] = Enum.at(values, 3) |
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machine_output = Enum.reduce(File.stream!("mfcsam-output.txt"), %{}, fn line, acc -> | |
[compound, amount | _] = String.split(line, [": ", "\n"]) | |
Dict.put(acc, compound, String.to_integer(amount)) | |
end) | |
scores = Enum.map(File.stream!("input.txt"), fn(line) -> | |
[name, params] = String.strip(line) |> String.split([": "], parts: 2) | |
params = params |> String.split([",", ": ", " "]) |> Enum.chunk(3,3, [" "]) | |
points = Enum.map(params, fn([compound, score, _]) -> |
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defmodule EggNog do | |
def part1(list, target) do | |
Enum.reduce(1..length(list), 0, fn (x, acc) -> | |
acc + (combinations(list, x) |> Enum.reduce(0, fn y, acc2 -> | |
if Enum.sum(y) == target, do: acc2+1, else: acc2 | |
end)) | |
end) | |
end | |
def part2(list, target) do |
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{lights, _} = Enum.reduce(File.stream!("input.txt"), {HashDict.new, 0}, fn line, {map, y} -> | |
{new_map, _} = Enum.reduce( (String.strip(line) |> String.codepoints), {map, 0}, fn c, {map, x} -> | |
cond do | |
{x, y} in [{0, 0}, {99, 0}, {0, 99}, {99, 99}] -> {Dict.put(map, {x, y}, 1), x + 1} | |
c == "#" -> {Dict.put(map, {x, y}, 1), x + 1} | |
c == "." -> {Dict.put(map, {x, y}, 0), x + 1} | |
end | |
end) | |
{HashDict.merge(map, new_map), y + 1} | |
end) |
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