added return type

Author: jenyyy4

data_structures/arrays/max_and_min.py

@@ -11,7 +11,7 @@
 >>> find_max_min([])
 """
 
-def find_max_min(arr):
+def find_max_min(arr: list[int]) -> tuple[int, int]:
     """
     Returns the maximum and minimum elements of a list.