feat(content): function signatures + test cases

backend/data/questions/longest-turbulent-subarray.yaml

@@ -10,6 +10,32 @@ patterns:
   - sliding-window
   - dynamic-programming
 
+function_signature: "def max_turbulence_size(arr: list[int]) -> int:"
+
+test_cases:
+  visible:
+    - input: { arr: [9, 4, 2, 10, 7, 8, 8, 1, 9] }
+      expected: 5
+    - input: { arr: [4, 8, 12, 16] }
+      expected: 2
+    - input: { arr: [100] }
+      expected: 1
+  hidden:
+    - input: { arr: [1, 2] }
+      expected: 2
+    - input: { arr: [2, 1] }
+      expected: 2
+    - input: { arr: [5, 5, 5, 5] }
+      expected: 1
+    - input: { arr: [1, 3, 2, 4, 3, 5, 4] }
+      expected: 7
+    - input: { arr: [9, 9] }
+      expected: 1
+    - input: { arr: [1, 2, 1, 2, 1, 2, 1] }
+      expected: 7
+    - input: { arr: [10, 5, 10, 5, 10] }
+      expected: 5
+
 description: |
   Given an integer array `arr`, return *the length of a maximum size turbulent subarray of* `arr`.