142 lines
4.5 KiB
EmacsLisp
Executable file
142 lines
4.5 KiB
EmacsLisp
Executable file
#!/usr/bin/env -S emacs --script
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;; -*- lexical-binding: t; -*-
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;; Copyright (C) 2022
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <https://www.gnu.org/licenses/>.
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(add-to-list 'load-path "../")
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(require 'ert)
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(require 'advent-of-code)
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(defvar solution-example-input
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"../../input/day-2-example.txt")
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(defvar solution-input
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"../../input/day-2.txt")
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(defvar solution-shapes
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'(rock paper scissors))
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(defvar solution-outcomes
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'(win lose draw))
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(defvar solution-opponent-letter-to-shape-alist
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'(("A" . rock)
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("B" . paper)
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("C" . scissors)))
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(defvar solution-player-letter-to-shape-alist
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'(("X" . rock)
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("Y". paper)
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("Z" . scissors)))
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(defvar solution-player-letter-to-outcome-alist
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'(("X" . lose)
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("Y" . draw)
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("Z" . win)))
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(defvar solution-shape-score-alist
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'((rock . 1)
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(paper . 2)
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(scissors . 3)))
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(defvar solution-outcome-score-alist
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'((win . 6)
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(draw . 3)
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(lose . 0)))
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;; Each shape points to another shape creating a cyclical list.
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;; Each shape points to the shape that it beats, so deciding a game
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;; outcome is a simple list search!
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(defvar solution-shape-outcome-alist
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'((rock . scissors)
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(scissors . paper)
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(paper . rock)))
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(defun solution-decide-game (a b)
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(cond ((equal a b)
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'draw)
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((equal (cdr (assoc a solution-shape-outcome-alist)) b)
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'win)
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(t
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'lose)))
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(defun solution-shape-for-outcome (a outcome)
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(pcase outcome
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('lose
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(cdr (assoc a solution-shape-outcome-alist)))
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('draw
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a)
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('win
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(car (seq-find (lambda (c)
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(equal (cdr c) a))
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solution-shape-outcome-alist)))))
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(defun solution-part-1 (input)
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(let ((rows (seq-map (lambda (s)
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(string-split s " " t))
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input)))
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(seq-reduce (lambda (acc row)
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(let* ((their-shape (cdr (assoc (car row) solution-opponent-letter-to-shape-alist)))
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(our-shape (cdr (assoc (cadr row) solution-player-letter-to-shape-alist)))
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(outcome (solution-decide-game our-shape their-shape)))
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(+ acc
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(cdr (assoc our-shape solution-shape-score-alist))
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(cdr (assoc outcome solution-outcome-score-alist)))))
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rows
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0)))
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(defun solution-part-2 (input)
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(let ((rows (seq-map (lambda (s)
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(string-split s " " t))
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input)))
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(seq-reduce (lambda (acc row)
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(let* ((their-shape (cdr (assoc (car row) solution-opponent-letter-to-shape-alist)))
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(desired-outcome (cdr (assoc (cadr row) solution-player-letter-to-outcome-alist)))
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(our-shape (solution-shape-for-outcome their-shape desired-outcome)))
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(+ acc
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(cdr (assoc our-shape solution-shape-score-alist))
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(cdr (assoc desired-outcome solution-outcome-score-alist)))))
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rows
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0)))
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(ert-deftest solution-test-decide-game ()
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(should (equal (solution-decide-game 'rock 'paper) 'lose))
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(should (equal (solution-decide-game 'paper 'rock) 'win))
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(should (equal (solution-decide-game 'rock 'rock) 'draw)))
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(ert-deftest solution-test-part-1-example ()
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(should (equal (solution-part-1 (aoc-read-file-lines solution-example-input)) 15)))
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(ert-deftest solution-test-part-1-input ()
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(should (equal (solution-part-1 (aoc-read-file-lines solution-input)) 12740)))
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(ert-deftest solution-test-part-2-example ()
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(should (equal (solution-part-2 (aoc-read-file-lines solution-example-input)) 12)))
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(ert-deftest solution-test-part-2 ()
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(should (equal (solution-part-2 (aoc-read-file-lines solution-input)) 11980)))
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(when noninteractive
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(ert-run-tests-batch-and-exit))
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;; Local Variables:
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;; read-symbol-shorthands: (("solution-" . "advent-of-code-day-2-") ("aoc-" . "advent-of-code-"))
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;; End:
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