diff options
Diffstat (limited to 'advent-of-code/2022/02/2.rkt')
| -rw-r--r-- | advent-of-code/2022/02/2.rkt | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/advent-of-code/2022/02/2.rkt b/advent-of-code/2022/02/2.rkt new file mode 100644 index 0000000..4b0dd02 --- /dev/null +++ b/advent-of-code/2022/02/2.rkt @@ -0,0 +1,45 @@ +#lang racket + +(require "../../lib/utils.rkt") + +(define lines + (call-with-input-file "input" + (lambda (fp) (get-lines fp)))) + +(define games (map string-split lines)) + +(define (transform-cheat mine oppo) + (cond ((string=? "X" mine) (cond ((string=? "A" oppo) "Z") + ((string=? "B" oppo) "X") + ((string=? "C" oppo) "Y"))) + ((string=? "Y" mine) (cond ((string=? "A" oppo) "X") + ((string=? "B" oppo) "Y") + ((string=? "C" oppo) "Z"))) + ((string=? "Z" mine) (cond ((string=? "A" oppo) "Y") + ((string=? "B" oppo) "Z") + ((string=? "C" oppo) "X"))))) + +(set! games + (map + (lambda (x) + (list (car x) (transform-cheat (cadr x) (car x)))) + games)) + +(define (score game) + (define (base-score mine) + (cond ((string=? "X" mine) 1) + ((string=? "Y" mine) 2) + ((string=? "Z" mine) 3))) + (define (win-score mine oppo) + (cond ((string=? "X" mine) (cond ((string=? "A" oppo) 3) + ((string=? "B" oppo) 0) + ((string=? "C" oppo) 6))) + ((string=? "Y" mine) (cond ((string=? "A" oppo) 6) + ((string=? "B" oppo) 3) + ((string=? "C" oppo) 0))) + ((string=? "Z" mine) (cond ((string=? "A" oppo) 0) + ((string=? "B" oppo) 6) + ((string=? "C" oppo) 3))))) + (+ (base-score (cadr game)) (win-score (cadr game) (car game)))) + +(apply + (map score games))
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