feat(content): function signatures + test cases

backend/data/questions/binary-prefix-divisible-by-5.yaml

@@ -9,6 +9,30 @@ categories:
 patterns:
   - prefix-sum
 
+function_signature: "def prefixes_div_by5(nums: list[int]) -> list[bool]:"
+
+test_cases:
+  visible:
+    - input: { nums: [0, 1, 1] }
+      expected: [true, false, false]
+    - input: { nums: [1, 1, 1] }
+      expected: [false, false, false]
+    - input: { nums: [1, 0, 1, 0] }
+      expected: [false, false, true, false]
+  hidden:
+    - input: { nums: [0] }
+      expected: [true]
+    - input: { nums: [1] }
+      expected: [false]
+    - input: { nums: [1, 0, 1] }
+      expected: [false, false, true]
+    - input: { nums: [0, 0, 0, 0, 0] }
+      expected: [true, true, true, true, true]
+    - input: { nums: [1, 1, 0, 0, 1] }
+      expected: [false, false, false, false, false]
+    - input: { nums: [1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1] }
+      expected: [false, false, false, false, true, true, true, false, false, true, true, true, true, true, true, false, false, false, false, false]
+
 description: |
   You are given a binary array `nums` (**0-indexed**).