feat(content): function signatures + test cases

backend/data/questions/can-place-flowers.yaml

@@ -8,6 +8,30 @@ categories:
 patterns:
   - greedy
 
+function_signature: "def can_place_flowers(flowerbed: list[int], n: int) -> bool:"
+
+test_cases:
+  visible:
+    - input: { flowerbed: [1, 0, 0, 0, 1], n: 1 }
+      expected: true
+    - input: { flowerbed: [1, 0, 0, 0, 1], n: 2 }
+      expected: false
+  hidden:
+    - input: { flowerbed: [0], n: 1 }
+      expected: true
+    - input: { flowerbed: [1], n: 0 }
+      expected: true
+    - input: { flowerbed: [0, 0, 0, 0, 0], n: 3 }
+      expected: true
+    - input: { flowerbed: [0, 0, 0, 0, 0], n: 4 }
+      expected: false
+    - input: { flowerbed: [1, 0, 0, 0, 0, 1], n: 1 }
+      expected: true
+    - input: { flowerbed: [0, 0, 1, 0, 0], n: 2 }
+      expected: true
+    - input: { flowerbed: [1, 0, 1, 0, 1], n: 1 }
+      expected: false
+
 description: |
   You have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in **adjacent** plots.