From 9528e817130da486a370bb4a1317662b9ef5d114 Mon Sep 17 00:00:00 2001
From: haskal <haskal@awoo.systems>
Date: Mon, 14 Dec 2020 00:28:48 -0500
Subject: [PATCH] day 14: now part 1 is no longer commented

---
 14.rkt | 39 ++++++++++++++++++++-------------------
 1 file changed, 20 insertions(+), 19 deletions(-)

diff --git a/14.rkt b/14.rkt
index b791256..bdfee9f 100644
--- a/14.rkt
+++ b/14.rkt
@@ -5,24 +5,25 @@
 ;; solution for day 14
 
 (define (part1 input)
-  (void))
-  ; (define (parse-mask msk)
-  ;   (define orval (for/fold ([val 0]) ([chr (in-string msk)])
-  ;                   (+ (* val 2) (if (equal? chr #\1) 1 0))))
-  ;   (define andval (for/fold ([val 0]) ([chr (in-string msk)])
-  ;                    (+ (* val 2) (if (equal? chr #\0) 0 1))))
-  ;   (cons orval andval))
-  ; (define orval 0)
-  ; (define andval (sub1 (expt 2 37)))
-  ; (define mem (make-hash))
-  ; (for ([ins (in-list input)])
-  ;   (match ins
-  ;     [(cons 'mask (cons ov av)) (set! orval ov) (set! andval av)]
-  ;     [(cons 'set (cons addr val))
-  ;      (define new-val (bitwise-ior (bitwise-and val andval) orval))
-  ;      (hash-set! mem addr new-val)]))
-  ; (for/sum ([(k v) (in-hash mem)])
-  ;   v))
+  (define (parse-mask msk)
+    (define orval (for/fold ([val 0]) ([chr (in-string msk)])
+                    (+ (* val 2) (if (equal? chr #\1) 1 0))))
+    (define andval (for/fold ([val 0]) ([chr (in-string msk)])
+                     (+ (* val 2) (if (equal? chr #\0) 0 1))))
+    (values orval andval))
+  (define orval 0)
+  (define andval (sub1 (expt 2 37)))
+  (define mem (make-hash))
+  (for ([ins (in-list input)])
+    (match ins
+      [(cons 'mask mask)
+       (define-values [ov av] (parse-mask mask))
+       (set! orval ov) (set! andval av)]
+      [(cons 'set (cons addr val))
+       (define new-val (bitwise-ior (bitwise-and val andval) orval))
+       (hash-set! mem addr new-val)]))
+  (for/sum ([(k v) (in-hash mem)])
+    v))
 
 (define (addr->bits addr)
   (vector-copy 
@@ -37,7 +38,7 @@
   (define mask #f)
   (for ([ins (in-list input)])
     (match ins
-      [(cons 'mask m) (set! mask m) (displayln mask)]
+      [(cons 'mask m) (set! mask m)]
       [(cons 'set (cons addr val))
        (define addr-bits (addr->bits addr))
        (for ([chr (in-string mask)] [i (in-naturals)])