Update subsequence_algorithms.py

Author: isatyamks

dynamic_programming/subsequence_algorithms.py

@@ -75,7 +75,8 @@ def longest_increasing_subsequence(array: list[int]) -> list[int]:
 
 
 # Longest Common Subsequence (LCS)
-def longest_common_subsequence(first_sequence: str, second_sequence: str):
+def longest_common_subsequence(first_sequence: str, second_sequence: str) -> tuple[int, str]:
+
     """
     Finds the longest common subsequence between two sequences (strings).
     Also returns the subsequence found.