From d3e864de00551774b0b6e2f2071285449eb86d2a Mon Sep 17 00:00:00 2001 From: Matthew Butterick Date: Thu, 17 Dec 2020 21:59:50 -0800 Subject: [PATCH] day 18 --- 2020/18.rkt | 39 ++++++ 2020/18.rktd | 379 +++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 418 insertions(+) create mode 100644 2020/18.rkt create mode 100644 2020/18.rktd diff --git a/2020/18.rkt b/2020/18.rkt new file mode 100644 index 0000000..149724d --- /dev/null +++ b/2020/18.rkt @@ -0,0 +1,39 @@ +#lang at-exp br +(require racket/file rackunit br/module) + +@module/lang[parser1]{ + #lang brag + op : [op ("+" | "*")] term + @"@"term : /"(" op /")" | digit + @"@"digit : "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" +} + +(require (prefix-in parser1: 'parser1)) + +(define (op . xs) + (match xs + [(list left opstr right) ((if (equal? opstr "*") * +) left (op right))] + [(list (? number? num)) num] + [(list (app string->number num)) num])) + +(define-namespace-anchor ns) + +(define ((solve parser) str) + (eval (parser (regexp-match* #px"\\S" str)) (namespace-anchor->namespace ns))) + +(check-equal? (apply + (map (solve parser1:parse) (file->lines "18.rktd"))) 9535936849815) + +@module/lang[parser2]{ + #lang brag + prod : [prod "*"] sum + sum : [sum "+"] term + @"@"term : /"(" prod /")" | digit + @"@"digit : "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" +} + +(define prod op) +(define sum op) + +(require (prefix-in parser2: 'parser2)) +(check-equal? +(apply + (map (solve parser2:parse) (file->lines "18.rktd"))) 472171581333710) \ No newline at end of file diff --git a/2020/18.rktd b/2020/18.rktd new file mode 100644 index 0000000..9e505d4 --- /dev/null +++ b/2020/18.rktd @@ -0,0 +1,379 @@ +((5 + 8 + 3) + 3) + (3 + 9 * 7) +((5 + 3) * 9 * (9 * 6 + 6 * 4) + (5 + 5)) * 8 * 9 +(7 + (6 * 3 + 6 * 4 * 9 + 3) * 4 + 6 + 8) + ((5 + 6 + 5 * 3 * 3) * (6 * 8 * 8 * 5 + 4)) * 7 + 9 * 6 +3 * 6 * 3 * 8 + (4 * 6 + 8 * (8 * 4 * 6 + 4) + (4 * 3 + 4 + 8 + 8 * 9) * 8) + 3 +6 * 4 + (9 * 9 + 5) + 5 * 4 + 9 +7 + 4 + 4 + 5 + (2 + (9 * 3 * 2) * 6) + 9 +2 + 4 + (2 * 9) + 3 * 9 + 9 +9 + ((6 + 2 * 3 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