From 8777ff071f7bb37631baa7b6717ad29961e50911 Mon Sep 17 00:00:00 2001
From: "H.J" <thechairman@thechairman.info>
Date: Wed, 9 Oct 2024 11:36:55 -0400
Subject: sorting by language

---
 racket/aoc2015/day-04/day-04.rkt | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 racket/aoc2015/day-04/day-04.rkt

(limited to 'racket/aoc2015/day-04/day-04.rkt')

diff --git a/racket/aoc2015/day-04/day-04.rkt b/racket/aoc2015/day-04/day-04.rkt
new file mode 100644
index 0000000..2c16043
--- /dev/null
+++ b/racket/aoc2015/day-04/day-04.rkt
@@ -0,0 +1,18 @@
+#lang racket
+(require "../../jj-aoc.rkt"
+         threading
+         file/md5)
+
+(define secret-key (~> (open-day 4 2015) port->string string-trim))
+
+(define (find-n-zeroes n)
+  (for/first ([i (in-naturals)]
+              #:when
+              (~>> i (~a secret-key) md5 bytes->string/utf-8 (string-prefix? _ (make-string n #\0))))
+    i))
+
+;; part 1
+(time (find-n-zeroes 5))
+
+;; part 2
+(time (find-n-zeroes 6))
-- 
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