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-rw-r--r--AoC2022/09/solver.el1
1 files changed, 1 insertions, 0 deletions
diff --git a/AoC2022/09/solver.el b/AoC2022/09/solver.el
index cf5ac7f..778c508 100644
--- a/AoC2022/09/solver.el
+++ b/AoC2022/09/solver.el
@@ -14,6 +14,7 @@
;; Day 09
;;
;;; Code:
+(require 'subr-x)
(defsubst solver-diff (head tail)
(cons (- (car head) (car tail)) (- (cdr head) (cdr tail))))