77 lines
2.6 KiB
EmacsLisp
Executable File
77 lines
2.6 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 default-directory)
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(require 'ert)
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(require 'advent-of-code)
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(defun solution-parse-pair (s)
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(let ((parts (string-split s "-")))
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(cons (string-to-number (car parts))
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(string-to-number (cadr parts)))))
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(defun solution-parse-pairs (line)
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(let ((unparsed-pairs (string-split line "," t)))
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(list (solution-parse-pair (car unparsed-pairs))
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(solution-parse-pair (cadr unparsed-pairs)))))
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(defun solution-pair-contains? (a b)
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(and (<= (car a) (car b))
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(>= (cdr a) (cdr b))))
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(defun solution-pair-overlaps? (a b)
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(or (and (>= (car a) (car b))
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(<= (car a) (cdr b)))
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(and (>= (cdr a) (car b))
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(<= (cdr a) (cdr b)))))
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(defun solution-part-1 (input)
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(let ((pairs (seq-map 'solution-parse-pairs input)))
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(seq-count (lambda (pair)
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(or (solution-pair-contains? (car pair) (cadr pair))
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(solution-pair-contains? (cadr pair) (car pair))))
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pairs)))
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(defun solution-part-2 (input)
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(let ((pairs (seq-map 'solution-parse-pairs input)))
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(seq-count (lambda (pair)
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(or (solution-pair-overlaps? (car pair) (cadr pair))
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(solution-pair-overlaps? (cadr pair) (car pair))))
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pairs)))
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(ert-deftest solution-part-1-example ()
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(should (equal (solution-part-1 (aoc-read-file-lines "example.txt")) 2)))
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(ert-deftest solution-part-1 ()
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(should (equal (solution-part-1 (aoc-read-file-lines "input.txt")) 644)))
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(ert-deftest solution-part-2-example ()
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(should (equal (solution-part-2 (aoc-read-file-lines "example.txt")) 4)))
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(ert-deftest solution-part-2 ()
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(should (equal (solution-part-2 (aoc-read-file-lines "input.txt")) 926)))
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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-4-") ("aoc-" . "advent-of-code-"))
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;; End:
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