| 1 | (asdf:load-system :adventofcode2020) |
| 2 | (in-package #:adventofcode2020) |
| 3 | (named-readtables:in-readtable :adventofcode2020) |
| 4 | |
| 5 | (defun count-answers (join ans-list) |
| 6 | (->> ans-list |
| 7 | (mapcar λ(map 'list #'identity _)) |
| 8 | (reduce λ(funcall join _0 _1 :test #'char=)) |
| 9 | (length))) |
| 10 | |
| 11 | (day 06 input |
| 12 | (let ((answer-groups (-<>> (list-from input) |
| 13 | (split-sequence "" <> :test #'string=))) |
| 14 | (disjunction (curry #'count-answers #'union)) |
| 15 | (conjunction (curry #'count-answers #'intersection) )) |
| 16 | (part1 (->> answer-groups (mapcar disjunction) (reduce #'+))) |
| 17 | (part2 (->> answer-groups (mapcar conjunction) (reduce #'+))))) |
| 18 | |
| 19 | (def-suite day06) |
| 20 | (in-suite day06) |
| 21 | |
| 22 | (test count-answers-disj |
| 23 | (is (equal |
| 24 | '(3 3 3 1 1) |
| 25 | (mapcar (curry #'count-answers #'union) |
| 26 | '(("abc") ("a" "b" "c") ("ab" "ac") |
| 27 | ("a" "a" "a" "a") ("b")))))) |
| 28 | |
| 29 | (test count-answers-conj |
| 30 | (is (equal |
| 31 | '(3 0 1 1 1) |
| 32 | (mapcar (curry #'count-answers #'intersection) |
| 33 | '(("abc") ("a" "b" "c") ("ab" "ac") |
| 34 | ("a" "a" "a" "a") ("b")))))) |
| 35 | |
| 36 | (run! 'day06) |