feat(content): function signatures + test cases

backend/data/questions/last-stone-weight.yaml

@@ -9,6 +9,28 @@ categories:
 patterns:
   - heap
 
+function_signature: "def last_stone_weight(stones: list[int]) -> int:"
+
+test_cases:
+  visible:
+    - input: { stones: [2, 7, 4, 1, 8, 1] }
+      expected: 1
+    - input: { stones: [1] }
+      expected: 1
+  hidden:
+    - input: { stones: [2, 2] }
+      expected: 0
+    - input: { stones: [1, 3] }
+      expected: 2
+    - input: { stones: [10, 4, 2, 10] }
+      expected: 2
+    - input: { stones: [1, 1, 1, 1, 1] }
+      expected: 1
+    - input: { stones: [5, 5, 5, 5] }
+      expected: 0
+    - input: { stones: [1000] }
+      expected: 1000
+
 description: |
   You are given an array of integers `stones` where `stones[i]` is the weight of the i<sup>th</sup> stone.