feat(content): function signatures + test cases

backend/data/questions/bulb-switcher-ii.yaml

@@ -8,6 +8,28 @@ categories:
 patterns:
   - greedy
 
+function_signature: "def flip_lights(n: int, presses: int) -> int:"
+
+test_cases:
+  visible:
+    - input: { n: 1, presses: 1 }
+      expected: 2
+    - input: { n: 2, presses: 1 }
+      expected: 3
+    - input: { n: 3, presses: 1 }
+      expected: 4
+  hidden:
+    - input: { n: 1, presses: 0 }
+      expected: 1
+    - input: { n: 3, presses: 2 }
+      expected: 7
+    - input: { n: 3, presses: 3 }
+      expected: 8
+    - input: { n: 10, presses: 5 }
+      expected: 8
+    - input: { n: 2, presses: 2 }
+      expected: 4
+
 description: |
   There is a room with `n` bulbs labelled from `1` to `n` that all are turned on initially, and **four buttons** on the wall. Each of the four buttons has a different functionality: