# Day 05
## Part 1
```elixir
[raw_stacks, raw_ops] =
"./2022/day05input.txt"
|> File.read!()
|> String.split("\n\n")
clean_stacks =
raw_stacks
|> String.to_charlist()
|> Enum.chunk_every(4)
|> Enum.map(&(&1 |> to_string() |> String.trim()))
nb_stacks = clean_stacks |> List.last() |> String.to_integer()
stacks =
clean_stacks
|> Enum.chunk_every(nb_stacks)
|> Enum.zip_with(& &1)
|> Map.new(fn line ->
[group | reversed] = Enum.reverse(line)
values = reversed |> Enum.reverse() |> Enum.reject(&(&1 == ""))
{group, values}
end)
ops = String.split(raw_ops, "\n")
Enum.reduce(
ops,
stacks,
fn
"", stacks ->
stacks
line, stacks ->
[_move, count_str, _from, start_pos, _to, end_pos] = String.split(line)
count = String.to_integer(count_str)
start_values = Map.fetch!(stacks, start_pos)
{moved, new_start_values} = Enum.split(start_values, count)
new_end_values = Enum.reverse(moved) ++ Map.fetch!(stacks, end_pos)
stacks
|> Map.put(start_pos, new_start_values)
|> Map.put(end_pos, new_end_values)
end
)
|> Enum.to_list()
|> Enum.sort_by(&elem(&1, 0))
|> Enum.map(fn {_group, stack} -> stack |> List.first() |> String.at(1) end)
|> Enum.join()
```
This is the most awful piece of code I've written in ages. But it works
## Part 2
```elixir
[raw_stacks, raw_ops] =
"./2022/day05input.txt"
|> File.read!()
|> String.split("\n\n")
clean_stacks =
raw_stacks
|> String.to_charlist()
|> Enum.chunk_every(4)
|> Enum.map(&(&1 |> to_string() |> String.trim()))
nb_stacks = clean_stacks |> List.last() |> String.to_integer()
stacks =
clean_stacks
|> Enum.chunk_every(nb_stacks)
|> Enum.zip_with(& &1)
|> Map.new(fn line ->
[group | reversed] = Enum.reverse(line)
values = reversed |> Enum.reverse() |> Enum.reject(&(&1 == ""))
{group, values}
end)
ops = String.split(raw_ops, "\n")
Enum.reduce(
ops,
stacks,
fn
"", stacks ->
stacks
line, stacks ->
[_move, count_str, _from, start_pos, _to, end_pos] = String.split(line)
count = String.to_integer(count_str)
start_values = Map.fetch!(stacks, start_pos)
{moved, new_start_values} = Enum.split(start_values, count)
# Removed the reverse, lol
new_end_values = moved ++ Map.fetch!(stacks, end_pos)
stacks
|> Map.put(start_pos, new_start_values)
|> Map.put(end_pos, new_end_values)
end
)
|> Enum.to_list()
|> Enum.sort_by(&elem(&1, 0))
|> Enum.map(fn {_group, stack} -> stack |> List.first() |> String.at(1) end)
|> Enum.join()
```
