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+ 5 + 8) + (8 + 9) +5 * 2 + 2 * 8 * 5 * (2 * 5) diff --git a/src/18.rkt b/src/18.rkt new file mode 100644 index 0000000..00d0ac1 --- /dev/null +++ b/src/18.rkt @@ -0,0 +1,32 @@ +#lang curly-fn racket + +(require "../lib.rkt") + +(define input + (map #{read (open-input-string (format "(~a)" %))} (problem-input 18))) + +(define (eval1 sexp) + (match sexp + [`,n #:when (number? n) n] + [`(,tail) (eval1 tail)] + [`(,rest ... + ,tail) + (+ (eval1 tail) (eval1 rest))] + [`(,rest ... * ,tail) + (* (eval1 tail) (eval1 rest))])) + +(define (eval2 sexp) + (match sexp + [`,n #:when (number? n) n] + [`(,tail) (eval2 tail)] + [`(,head ... ,left + ,right ,tail ...) + (eval2 `(,@head ,(+ (eval2 left) (eval2 right)) ,@tail))] + [`(,head ... ,left * ,right ,tail ...) + (eval2 `(,@head ,(* (eval2 left) (eval2 right)) ,@tail))])) + +(define part1 + (sum (map eval1 input))) + +(define part2 + (sum (map eval2 input))) + +(show-solution part1 part2)