Adding input and return hints.

I’ve added type hints for the function parameters and return values in the examples

Author: lydia321

data_structures/sliding_window/longest_substring_two_distinct.py

@@ -1,4 +1,4 @@
-def length_of_longest_substring_two_distinct(s):
+def length_of_longest_substring_two_distinct(string: str) -> int:
     """
     Finds the length of the longest substring with at most two distinct characters.[https://www.geeksforgeeks.org/window-sliding-technique/]
 

data_structures/sliding_window/max_sum_subarray.py

@@ -1,4 +1,7 @@
-def max_sum_subarray(arr, k):
+from typing import List
+
+
+def max_sum_subarray(array: List[int], subarray_length: int) -> int:
     """
     Finds the maximum sum of a subarray of length k within the given array.[https://www.geeksforgeeks.org/window-sliding-technique/]
 

data_structures/sliding_window/min_subarray_len.py

@@ -1,4 +1,7 @@
-def min_subarray_len(target, nums):
+from typing import List
+
+
+def min_subarray_len(target_sum: int, numbers: List[int]) -> int:
     """
     Finds the minimal length of a contiguous subarray of which the sum is at least the target.[https://www.geeksforgeeks.org/window-sliding-technique/]