84 lines
3.1 KiB
EmacsLisp
Executable file
84 lines
3.1 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-input
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"../../input/day-3.txt")
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(defvar solution-example-input
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"../../input/day-3-example.txt")
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(defun solution-letter-priority (char)
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(if (char-uppercase-p char)
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(+ (- char ?A) 26 1)
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(+ (- char ?a) 1)))
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(defun solution-3-way-intersection (a b c)
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(seq-intersection (seq-intersection a b) c))
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(defun solution-part-1 (input)
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(let* ((char-lists (seq-map 'string-to-list input))
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(split-into-halves (seq-map (lambda (char-list)
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(seq-split char-list (/ (length char-list) 2)))
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char-lists))
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(common-items (seq-map (lambda (halves)
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(if-let ((intersection (seq-intersection (car halves) (cadr halves))))
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(car intersection)
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nil))
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split-into-halves))
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(filter-nils (seq-filter (lambda (item)
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(not (null item)))
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common-items))
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(item-priorities (seq-map 'solution-letter-priority common-items)))
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(apply '+ item-priorities)))
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(defun solution-part-2 (input)
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(let* ((char-lists (seq-map 'string-to-list input))
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(groups (seq-split char-lists 3))
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(common-items (seq-map (lambda (group)
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(car (seq-intersection (seq-intersection (car group)
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(cadr group))
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(caddr group))))
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groups))
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(item-priorites (seq-map 'solution-letter-priority common-items)))
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(apply '+ item-priorites)))
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(ert-deftest solution-part-1-example ()
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(should (equal (solution-part-1 (aoc-read-file-lines solution-example-input)) 157)))
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(ert-deftest solution-part-1 ()
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(should (equal (solution-part-1 (aoc-read-file-lines solution-input)) 7878)))
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(ert-deftest solution-part-2-example ()
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(should (equal (solution-part-2 (aoc-read-file-lines solution-example-input)) 70)))
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(ert-deftest solution-part-2 ()
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(should (equal (solution-part-2 (aoc-read-file-lines solution-input)) 2760)))
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(when noninteractive
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(ert-run-tests-batch))
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;; Local Variables:
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;; read-symbol-shorthands: (("solution-" . "advent-of-code-day-3-") ("aoc-" . "advent-of-code-"))
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;; End:
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