<!-- livebook:{"persist_outputs":true} -->

# Day 17

```elixir
Mix.install([
  {:kino_aoc, git: "https://github.com/ljgago/kino_aoc"}
])
```

<!-- livebook:{"output":true} -->

```
* Getting kino_aoc (https://github.com/ljgago/kino_aoc)
remote: Enumerating objects: 103, done.        
remote: Counting objects: 100% (103/103), done.        
remote: Compressing objects: 100% (68/68), done.        
remote: Total 103 (delta 40), reused 84 (delta 25), pack-reused 0        
origin/HEAD set to main
Resolving Hex dependencies...
Resolution completed in 0.336s
New:
  castore 1.0.3
  finch 0.16.0
  hpax 0.1.2
  jason 1.4.1
  kino 0.10.0
  mime 2.0.5
  mint 1.5.1
  nimble_options 1.0.2
  nimble_pool 1.0.0
  req 0.3.10
  table 0.1.2
  telemetry 1.2.1
* Getting kino (Hex package)
* Getting req (Hex package)
* Getting finch (Hex package)
* Getting jason (Hex package)
* Getting mime (Hex package)
* Getting castore (Hex package)
* Getting mint (Hex package)
* Getting nimble_options (Hex package)
* Getting nimble_pool (Hex package)
* Getting telemetry (Hex package)
* Getting hpax (Hex package)
* Getting table (Hex package)
==> table
Compiling 5 files (.ex)
Generated table app
==> mime
Compiling 1 file (.ex)
Generated mime app
==> nimble_options
Compiling 3 files (.ex)
Generated nimble_options app
==> kino
Compiling 41 files (.ex)
Generated kino app
===> Analyzing applications...
===> Compiling telemetry
==> jason
Compiling 10 files (.ex)
Generated jason app
==> hpax
Compiling 4 files (.ex)
Generated hpax app
==> nimble_pool
Compiling 2 files (.ex)
Generated nimble_pool app
==> castore
Compiling 1 file (.ex)
Generated castore app
==> mint
Compiling 1 file (.erl)
Compiling 19 files (.ex)
Generated mint app
==> finch
Compiling 13 files (.ex)
Generated finch app
==> req
Compiling 5 files (.ex)
Generated req app
==> kino_aoc
Compiling 3 files (.ex)
Generated kino_aoc app
```

<!-- livebook:{"output":true} -->

```
:ok
```

## Section

<!-- livebook:{"attrs":{"day":"17","session_secret":"ADVENT_OF_CODE_SESSION","variable":"puzzle_input","year":"2022"},"chunks":null,"kind":"Elixir.KinoAOC.HelperCell","livebook_object":"smart_cell"} -->

```elixir
{:ok, puzzle_input} =
  KinoAOC.download_puzzle("2022", "17", System.fetch_env!("LB_ADVENT_OF_CODE_SESSION"))
```

<!-- livebook:{"output":true} -->

```
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```

```elixir
well = [0, 0, 0, 0, 0, 0, 0]
```

<!-- livebook:{"output":true} -->

```
[0, 0, 0, 0, 0, 0, 0]
```

```elixir
defmodule Tetris do
  def fit(well, n, :dash) when n in 0..3 do
    max =
      well
      |> Enum.drop(n)
      |> Enum.take(4)
      |> Enum.max()

    well
    |> List.replace_at(n, max + 1)
    |> List.replace_at(n + 1, max + 1)
    |> List.replace_at(n + 2, max + 1)
    |> List.replace_at(n + 3, max + 1)
  end

  def fit(well, n, :plus) when n in 0..4 do
    bottom =
      well
      |> Enum.drop(n)
      |> Enum.take(3)
      |> case do
        [a, b, c] when b < a and b < c -> max(a, b) - 1
        [_, b, _] -> b
      end

    well
    |> List.replace_at(n, bottom + 2)
    |> List.replace_at(n + 1, bottom + 3)
    |> List.replace_at(n + 2, bottom + 2)
  end

  def fit(well, n, :l), do: well

  def fit(well, n, :i), do: well

  def fit(well, n, :o), do: well
end
```

<!-- livebook:{"output":true} -->

```
warning: variable "n" is unused (if the variable is not meant to be used, prefix it with an underscore)
  2022/day17.livemd#cell:yqwk3yzwldnf4hstvs2cj6qm5r3go5yp:32: Tetris.fit/3

warning: variable "n" is unused (if the variable is not meant to be used, prefix it with an underscore)
  2022/day17.livemd#cell:yqwk3yzwldnf4hstvs2cj6qm5r3go5yp:34: Tetris.fit/3

warning: variable "n" is unused (if the variable is not meant to be used, prefix it with an underscore)
  2022/day17.livemd#cell:yqwk3yzwldnf4hstvs2cj6qm5r3go5yp:36: Tetris.fit/3

```

<!-- livebook:{"output":true} -->

```
{:module, Tetris, <<70, 79, 82, 49, 0, 0, 10, ...>>, {:fit, 3}}
```

```elixir
Tetris.fit([2, 1, 2, 0, 0, 0, 0], 0, :plus)
```

<!-- livebook:{"output":true} -->

```
[3, 4, 3, 0, 0, 0, 0]
```