feat(content): hidden test cases

backend/data/questions/stone-game.yaml

@@ -10,6 +10,24 @@ categories:
 patterns:
   - dynamic-programming
 
+function_signature: "def stone_game(piles: list[int]) -> bool:"
+
+test_cases:
+  visible:
+    - input: { piles: [5, 3, 4, 5] }
+      expected: true
+    - input: { piles: [3, 7, 2, 3] }
+      expected: true
+  hidden:
+    - input: { piles: [1, 2] }
+      expected: true
+    - input: { piles: [1, 100, 1, 100] }
+      expected: true
+    - input: { piles: [7, 8, 8, 10] }
+      expected: true
+    - input: { piles: [3, 2, 10, 4] }
+      expected: true
+
 description: |
   Alice and Bob play a game with piles of stones. There are an **even** number of piles arranged in a row, and each pile has a **positive** integer number of stones `piles[i]`.