feat(content): function signatures + test cases

backend/data/questions/arithmetic-slices-ii-subsequence.yaml

@@ -10,6 +10,30 @@ categories:
 patterns:
   - dynamic-programming
 
+function_signature: "def number_of_arithmetic_slices(nums: list[int]) -> int:"
+
+test_cases:
+  visible:
+    - input: { nums: [2, 4, 6, 8, 10] }
+      expected: 7
+    - input: { nums: [7, 7, 7, 7, 7] }
+      expected: 16
+  hidden:
+    - input: { nums: [1] }
+      expected: 0
+    - input: { nums: [1, 2] }
+      expected: 0
+    - input: { nums: [1, 2, 3] }
+      expected: 1
+    - input: { nums: [1, 3, 5, 7] }
+      expected: 3
+    - input: { nums: [0, 0, 0, 0] }
+      expected: 5
+    - input: { nums: [1, 1, 1, 1, 1, 1] }
+      expected: 42
+    - input: { nums: [1, 2, 3, 4, 5, 6] }
+      expected: 12
+
 description: |
   Given an integer array `nums`, return *the number of all the **arithmetic subsequences** of* `nums`.