feat(content): function signatures + test cases

backend/data/questions/house-robber-iii.yaml

@@ -10,6 +10,28 @@ patterns:
   - dfs
   - dynamic-programming
 
+function_signature: "def rob(root: TreeNode) -> int:"
+
+test_cases:
+  visible:
+    - input: { root: [3, 2, 3, null, 3, null, 1] }
+      expected: 7
+    - input: { root: [3, 4, 5, 1, 3, null, 1] }
+      expected: 9
+  hidden:
+    - input: { root: [1] }
+      expected: 1
+    - input: { root: [1, 2, 3] }
+      expected: 5
+    - input: { root: [4, 1, null, 2, null, 3] }
+      expected: 7
+    - input: { root: [2, 1, 3, null, 4] }
+      expected: 7
+    - input: { root: [0, 0, 0, 0, 0] }
+      expected: 0
+    - input: { root: [1, null, 2, null, 3, null, 4] }
+      expected: 6
+
 description: |
   The thief has found himself a new place for his thievery again. There is only one entrance to this area, called `root`.