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+;;; solver.el --- Day 06 -*- lexical-binding: t; -*-
+;;
+;; Copyright (C) 2022 Óscar Nájera
+;;
+;; Author: Óscar Nájera <hi@oscarnajera.com>
+;; Maintainer: Óscar Nájera <hi@oscarnajera.com>
+;; Created: December 06, 2022
+;; Modified: December 06, 2022
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; Commentary:
+;;
+;;  Day 06
+;;
+;;; Code:
+;;;
+
+(require 'ert)
+
+(defun solver (start-marker-len)
+  (with-temp-buffer
+    (insert-file-contents-literally "input")
+    (goto-char (point-min))
+    (cl-loop with acc = (make-ring start-marker-len)
+             for chr = (prog1 (char-after) (forward-char))
+             do (ring-insert acc chr)
+             count chr
+             while (< (length (seq-uniq (ring-elements acc) #'eq)) start-marker-len))))
+
+(ert-deftest test-solver ()
+  (should (= 1655 (solver 4)))
+  (should (= 2665 (solver 14))))