From 7f3c46c9e1aca82cc0a4355e906eac140df26a61 Mon Sep 17 00:00:00 2001
From: HJ <thechairman@thechairman.info>
Date: Sat, 9 Dec 2023 10:05:41 -0500
Subject: day 9 alternate racket solution

---
 aoc2023-other/day-09/day-09-polynomial.rkt | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 aoc2023-other/day-09/day-09-polynomial.rkt

(limited to 'aoc2023-other')

diff --git a/aoc2023-other/day-09/day-09-polynomial.rkt b/aoc2023-other/day-09/day-09-polynomial.rkt
new file mode 100644
index 0000000..31c0d3d
--- /dev/null
+++ b/aoc2023-other/day-09/day-09-polynomial.rkt
@@ -0,0 +1,13 @@
+#lang racket
+
+(require advent-of-code
+         threading
+         simple-polynomial/tools)
+
+(define histories
+  (for/list ([raw-history (in-lines (open-aoc-input (find-session) 2023 9 #:cache #true))])
+    (~>> raw-history string-split (map string->number))))
+
+(for/lists (left right #:result (cons (apply + left) (apply + right)))([history (in-list histories)])
+  (define f (interpolate-at-integer-points history))
+  (values (f -1) (f (length history))))
-- 
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