[REFACTOR] [Hacker Rank] Interview Preparation Kit: Greedy Algorithms: Luck Balance. Type hinting added.

Author: Gonzalo Diaz

src/hackerrank/interview_preparation_kit/greedy_algorithms/luck_balance.py

@@ -34,8 +34,9 @@ def luck_balance(k, contests: list) -> int:
         key=lambda contest: (-contest['important'], -contest['luck'])
     )
 
-    total = 0
-    size = len(important_competitions)
+    total: int = 0
+    size: int = len(important_competitions)
+
     for i in range(0, min(k, size)):
         total += important_competitions[i].luck