From fafbeaf9e3c09ba7a5bea7e47d5736001f8a5aa1 Mon Sep 17 00:00:00 2001
From: HJ <thechairman@thechairman.info>
Date: Tue, 17 Jan 2023 12:46:04 -0500
Subject: adding old leetcode solutions

---
 leetcode/lc-1018-binary-prefix.rkt | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 leetcode/lc-1018-binary-prefix.rkt

(limited to 'leetcode/lc-1018-binary-prefix.rkt')

diff --git a/leetcode/lc-1018-binary-prefix.rkt b/leetcode/lc-1018-binary-prefix.rkt
new file mode 100644
index 0000000..fa82681
--- /dev/null
+++ b/leetcode/lc-1018-binary-prefix.rkt
@@ -0,0 +1,11 @@
+#lang racket
+(define/contract (prefixes-div-by5 A)
+  (-> (listof exact-integer?) (listof boolean?))
+  (define ns (make-vector (length A) #false))
+  (for/fold ([acc 0])
+            ([b (in-list A)]
+             [i (in-naturals)])
+    (let ([test-val (remainder (+ (* 2. acc) b) 5)])
+      (when (= 0 test-val) (vector-set! ns i #true))
+      test-val))
+  (vector->list ns))
\ No newline at end of file
-- 
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