feat(content): function signatures + test cases

backend/data/questions/binary-subarrays-with-sum.yaml

@@ -10,6 +10,28 @@ patterns:
   - sliding-window
   - prefix-sum
 
+function_signature: "def num_subarrays_with_sum(nums: list[int], goal: int) -> int:"
+
+test_cases:
+  visible:
+    - input: { nums: [1, 0, 1, 0, 1], goal: 2 }
+      expected: 4
+    - input: { nums: [0, 0, 0, 0, 0], goal: 0 }
+      expected: 15
+  hidden:
+    - input: { nums: [1, 1, 1, 1, 1], goal: 3 }
+      expected: 3
+    - input: { nums: [1, 0, 0, 0, 1], goal: 1 }
+      expected: 8
+    - input: { nums: [0, 1, 0], goal: 1 }
+      expected: 4
+    - input: { nums: [1], goal: 1 }
+      expected: 1
+    - input: { nums: [0], goal: 0 }
+      expected: 1
+    - input: { nums: [1, 1, 1], goal: 5 }
+      expected: 0
+
 description: |
   Given a binary array `nums` and an integer `goal`, return *the number of non-empty **subarrays** with a sum equal to* `goal`.