From a7133eca13d312fa729e2872048c7d9a662f6c8c Mon Sep 17 00:00:00 2001
From: "Tan Kai Qun, Jeremy" <tan_kai_qun97@yahoo.com.sg>
Date: Wed, 4 Oct 2023 11:06:52 +0900
Subject: [PATCH] Add typing (#9652)

Co-authored-by: Jeremy Tan <jeremytan@stripe.com>
---
 sorts/shell_sort.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sorts/shell_sort.py b/sorts/shell_sort.py
index 10ae9ba40..b65609c97 100644
--- a/sorts/shell_sort.py
+++ b/sorts/shell_sort.py
@@ -3,7 +3,7 @@ https://en.wikipedia.org/wiki/Shellsort#Pseudocode
 """
 
 
-def shell_sort(collection):
+def shell_sort(collection: list[int]) -> list[int]:
     """Pure implementation of shell sort algorithm in Python
     :param collection:  Some mutable ordered collection with heterogeneous
     comparable items inside