1 files changed, 11 insertions, 0 deletions
diff --git a/racket/leetcode/lc-1018-binary-prefix.rkt b/racket/leetcode/lc-1018-binary-prefix.rkt
new file mode 100644
index 0000000..fa82681
--- /dev/null
+++ b/racket/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