From 7ca1851f732e2f74339354ecc25ef709754a3ac3 Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Tue, 6 Dec 2022 17:26:18 +0100
Subject: [AoC2022] 06 Rust & Elixir

---
 AoC2022/06/makefile   |  4 ++--
 AoC2022/06/solver.exs | 27 +++++++++++++++++++++++++++
 AoC2022/06/solver.rs  | 27 +++++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 2 deletions(-)
 create mode 100644 AoC2022/06/solver.exs
 create mode 100644 AoC2022/06/solver.rs

(limited to 'AoC2022')

diff --git a/AoC2022/06/makefile b/AoC2022/06/makefile
index fce871b..3ddfc1a 100644
--- a/AoC2022/06/makefile
+++ b/AoC2022/06/makefile
@@ -11,5 +11,5 @@
 run:
 	sbcl --load ~/.sbclrc --script solver.lisp
 	emacs -batch -l ert -l solver.el -f ert-run-tests-batch-and-exit
-	# rustc solver.rs && ./solver
-	# elixir solver.ex
+	rustc solver.rs -o /tmp/solver && /tmp/solver
+	elixir solver.exs
diff --git a/AoC2022/06/solver.exs b/AoC2022/06/solver.exs
new file mode 100644
index 0000000..3d47677
--- /dev/null
+++ b/AoC2022/06/solver.exs
@@ -0,0 +1,27 @@
+defmodule Solver.Day6 do
+  def marker([_h | tail] = line, distinct, counter) do
+    line
+    |> Enum.take(distinct)
+    |> MapSet.new()
+    |> MapSet.size()
+    |> Kernel.then(fn amount ->
+      case amount do
+        ^distinct -> counter
+        _ -> marker(tail, distinct, counter + 1)
+      end
+    end)
+  end
+
+  def start(msg, distinct) do
+    String.graphemes(msg) |> marker(distinct, distinct) |> IO.puts()
+  end
+end
+
+case File.read("input") do
+  {:ok, body} ->
+    Solver.Day6.start(body, 4)
+    Solver.Day6.start(body, 14)
+
+  {:error, reason} ->
+    IO.puts(reason)
+end
diff --git a/AoC2022/06/solver.rs b/AoC2022/06/solver.rs
new file mode 100644
index 0000000..0d59479
--- /dev/null
+++ b/AoC2022/06/solver.rs
@@ -0,0 +1,27 @@
+use std::fs;
+use std::io::{self, Read};
+
+fn solver(bytes: &Vec<u8>, marker_len: u32) -> u32 {
+    let mut count = marker_len;
+    for view in bytes.windows(marker_len as usize) {
+        let mut acc: u32 = 0;
+        for elt in view {
+            acc |= 1 << (elt - 96);
+        }
+        if u32::count_ones(acc) >= marker_len {
+            break;
+        }
+        count += 1;
+    }
+    count
+}
+
+fn main() -> io::Result<()> {
+    let mut file = fs::File::open("input").unwrap();
+    let mut bytes: Vec<u8> = Vec::new();
+    file.read_to_end(&mut bytes)?;
+    println!("All test passed. {}", solver(&bytes, 4));
+    println!("All test passed. {}", solver(&bytes, 14));
+
+    Ok(())
+}
-- 
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