feat(content): hidden test cases

backend/data/questions/house-robber.yaml

@@ -26,6 +26,12 @@ test_cases:
       expected: 9
     - input: { nums: [0, 0, 0, 0] }
       expected: 0
+    - input: { nums: [100, 1, 1, 100] }
+      expected: 200
+    - input: { nums: [2, 1, 1, 2] }
+      expected: 4
+    - input: { nums: [1, 3, 1, 3, 100] }
+      expected: 103
 
 description: |
   You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses have security systems connected and **it will automatically contact the police if two adjacent houses were broken into on the same night**.