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Diffstat (limited to 'aoc2020/day-01/day-01.rkt')
| -rw-r--r-- | aoc2020/day-01/day-01.rkt | 20 |
1 files changed, 0 insertions, 20 deletions
diff --git a/aoc2020/day-01/day-01.rkt b/aoc2020/day-01/day-01.rkt deleted file mode 100644 index e31c45c..0000000 --- a/aoc2020/day-01/day-01.rkt +++ /dev/null @@ -1,20 +0,0 @@ -#lang racket -(require "../../jj-aoc.rkt" - threading) - -(define entries (~>> (open-day 01 2020) (port->list read) list->set)) - -;; part 1 -(define (look-for-complement xs) - (define x (set-first xs)) - (cond - [(set-member? xs (- 2020 x)) (* x (- 2020 x))] - [else (look-for-complement (set-rest xs))])) - -(time (look-for-complement entries)) - -;; part 2 -(time (for*/first ([x (in-set entries)] - [y (in-set (set-subtract entries (set x)))] - #:when (set-member? (set-subtract entries (set x y)) (- 2020 x y))) - (* x y (- 2020 x y)))) |