| 1 | (asdf:load-system :adventofcode2020) |
| 2 | (in-package #:adventofcode2020) |
| 3 | |
| 4 | (defun calculate-expenses (&rest reports) |
| 5 | (let ((prod (apply #'cartesian-product reports))) |
| 6 | (loop for tuple in prod |
| 7 | when (= (apply #'+ tuple) 2020) |
| 8 | return (apply #'* tuple)))) |
| 9 | |
| 10 | (day 01 input |
| 11 | (let ((report (int-list-from input))) |
| 12 | (part1 (calculate-expenses report report)) |
| 13 | (part2 (calculate-expenses report report report)))) |
| 14 | |
| 15 | (def-suite day01) |
| 16 | (in-suite day01) |
| 17 | |
| 18 | (test simple-expenses |
| 19 | (is (equal |
| 20 | 514579 |
| 21 | (let ((report '(1721 979 366 299 675 1456))) |
| 22 | (calculate-expenses report report))))) |
| 23 | |
| 24 | (test complex-expenses |
| 25 | (is (equal |
| 26 | 241861950 |
| 27 | (let ((report '(1721 979 366 299 675 1456))) |
| 28 | (calculate-expenses report report report))))) |
| 29 | |
| 30 | (run! 'day01) |